| Alshawaf F, Fersch B, Hinz S, Kunstmann H, Mayer M and Meyer FJ (2015), "Water vapor mapping by fusing InSAR and GNSS remote sensing data and atmospheric simulations", Hydrology and Earth System Sciences., jan, 2015. Vol. 19(12), pp. 4747-4764. Copernicus GmbH. |
| Abstract: Data fusion aims at integrating multiple data sources that can be redundant or complementary to produce complete, accurate information of the parameter of interest. In this work, data fusion of precipitable water vapor (PWV) estimated from remote sensing observations and data from the Weather Research and Forecasting (WRF) modeling system is applied to provide complete, accurate grids of PWV. Our goal is to infer spatially continuous, precise grids of PWV from heterogeneous data sets. This is done by a geostatistical data fusion approach based on the method of fixed-rank kriging. The first data set contains absolute maps of atmospheric water vapor produced by combining observations from Global Navigation Satellite Systems (GNSS) and Interferometric Synthetic Aperture Radar (InSAR). These PWV maps have a high spatial density and an accuracy of submillimeter; however, data are missing in regions of low coherence (e.g., forests and vegetated areas). The PWV maps simulated by the WRF model represent the second data set. The model maps are available for wide areas, but they have a coarse spatial resolution and a yet limited accuracy. The PWV maps inferred by the data fusion at any spatial resolution are more accurate than those inferred from single data sets. In addition, using the fixed-rank kriging method, the computational burden is significantly lower than that for ordinary kriging. |
BibTeX:
@article{Alshawaf_2015,
author = {Alshawaf, F. and Fersch, B. and Hinz, S. and Kunstmann, H. and Mayer, M. and Meyer, F. J.},
title = {Water vapor mapping by fusing InSAR and GNSS remote sensing data and atmospheric simulations},
journal = {Hydrology and Earth System Sciences},
publisher = {Copernicus GmbH},
year = {2015},
volume = {19},
number = {12},
pages = {4747--4764},
url = {http://dx.doi.org/10.5194/hessd-12-363-2015 http://www.hydrol-earth-syst-sci-discuss.net/12/363/2015/},
doi = {10.5194/hess-19-4747-2015}
}
|
| Alshawaf F, Fuhrmann T, Heck B, Hinz S, Knoepfler A, Luo X, Mayer M, Schenk A, Thiele A and Westerhaus M (2012), "Atmospheric Water Vapour Determination by the Integration of InSAR and GNSS Observation", In Lecture Notes in Geoinformation and Cartography., nov, 2012. Vol. 2011(January), pp. 19-23. Springer Science $mathplus Business Media. |
BibTeX:
@incollection{Alshawaf_2012,
author = {Alshawaf, Fadwa and Fuhrmann, Thomas and Heck, Bernhard and Hinz, Stefan and Knoepfler, Andreas and Luo, Xiaoguang and Mayer, Michael and Schenk, Andreas and Thiele, Antje and Westerhaus, Malte},
title = {Atmospheric Water Vapour Determination by the Integration of InSAR and GNSS Observation},
booktitle = {Lecture Notes in Geoinformation and Cartography},
publisher = {Springer Science $mathplus Business Media},
year = {2012},
volume = {2011},
number = {January},
pages = {19--23},
url = {http://dx.doi.org/10.1007/978-3-642-32714-810},
doi = {10.1007/978-3-642-32714-8{\_}10}
}
|
| Alshawaf F, Fuhrmann T, Knöpfler A, Luo X, Mayer M, Hinz S and Heck B (2015), "Accurate Estimation of Atmospheric Water Vapor Using GNSS Observations and Surface Meteorological Data", IEEE Transactions on Geoscience and Remote Sensing., jul, 2015. Vol. 53(7), pp. 3764-3771. Institute of Electrical & Electronics Engineers (IEEE). |
BibTeX:
@article{AlshawafFuhrmannKnoepflerEtAl2015,
author = {Alshawaf, F. and Fuhrmann, T. and Knöpfler, A. and Luo, X. and Mayer, M. and Hinz, S. and Heck, B.},
title = {Accurate Estimation of Atmospheric Water Vapor Using GNSS Observations and Surface Meteorological Data},
journal = {IEEE Transactions on Geoscience and Remote Sensing},
publisher = {Institute of Electrical & Electronics Engineers (IEEE)},
year = {2015},
volume = {53},
number = {7},
pages = {3764--3771},
url = {http://dx.doi.org/10.1109/tgrs.2014.2382713},
doi = {10.1109/TGRS.2014.2382713}
}
|
| Alshawaf F, Hinz S, Mayer M and Meyer FJ (2015), "Constructing accurate maps of atmospheric water vapor by combining interferometric synthetic aperture radar and GNSS observations", Journal of Geophysical Research Atmospheres., feb, 2015. Vol. 120(4), pp. 1391-1403. Wiley-Blackwell. |
| Abstract: Over the past 20years, repeat-pass spaceborne interferometric synthetic aperture radar (InSAR) has been widely used as a geodetic technique to generate maps of the Earth's topography and to measure the Earth's surface deformation. In this paper, we present a new approach to exploit microwave data from InSAR, particularly Persistent Scatterer InSAR (PSI), and Global Navigation Satellite Systems (GNSS) to derive maps of the absolute water vapor content in the Earth's atmosphere. Atmospheric water vapor results in a phase shift in the InSAR interferogram, which if successfully separated from other phase components provides valuable information about its distribution. PSI produces precipitable water vapor (PWV) difference maps of a high spatial density, which can be inverted using the least squares method to retrieve PWV maps at each SAR acquisition time. These maps do not contain the absolute (total) PWV along the signal path but only a part of it. The components eliminated by forming interferograms or phase filtering during PSI data processing are reconstructed using GNSS phase observations. The approach is applied to build maps of absolute PWV by combining data from InSAR and GNSS over the region of Upper Rhine Graben in Germany and France. For validation, we compared the derived PWV maps with PWV maps measured by the optical sensor MEdium-Resolution Imaging Spectrometer. The results show strong spatial correlation with values of uncertainty of less than 1.5mm. Continuous grids of PWV are then produced by applying the kriging geostatistical interpolation technique that exploits the spatial correlations between the PWV observations. |
BibTeX:
@article{AlshawafHinzMayerEtAl2015,
author = {Alshawaf, Fadwa and Hinz, Stefan and Mayer, Michael and Meyer, Franz J.},
title = {Constructing accurate maps of atmospheric water vapor by combining interferometric synthetic aperture radar and GNSS observations},
journal = {Journal of Geophysical Research Atmospheres},
publisher = {Wiley-Blackwell},
year = {2015},
volume = {120},
number = {4},
pages = {1391--1403},
url = {http://dx.doi.org/10.1002/2014jd022419},
doi = {10.1002/2014JD022419}
}
|
| Asensio E, Khazaradze G, Echeverria A, King RW and Vilajosana I (2012), "GPS studies of active deformation in the Pyrenees", Geophysical Journal International., may, 2012. Vol. 190(2), pp. 913-921. Oxford University Press (OUP). |
| Abstract: The Pyrenees mountain belt, which separates the Iberian Peninsula from the rest of the European continent, is part of the Alpine–Himalayan orogenic belt, formed as a result of a collision between the African and Eurasian Plates. Although the instrumental seismicity in the Pyrenees is moderate, in the past centuries a number of destructive earthquakes have occurred, which could indicate continuing tectonic activity of the area. We analyse GPS observations spanning 3.5 yr from 35 continuous stations in the Pyrenees region and find significant on-going extension perpendicular to the range at 2.5 ± 0.5 nstrain yr–1, with the possibility of higher strain rates concentrated in the westernmost part of the range. This finding is in agreement with the predominantly normal faulting focal mechanisms of earthquakes that occur in the area and suggests a recurrence time for magnitude 6.5 earthquakes of 2200–2500 yr. |
BibTeX:
@article{Asensio_2012,
author = {Asensio, E. and Khazaradze, G. and Echeverria, A. and King, R. W. and Vilajosana, I.},
title = {GPS studies of active deformation in the Pyrenees},
journal = {Geophysical Journal International},
publisher = {Oxford University Press (OUP)},
year = {2012},
volume = {190},
number = {2},
pages = {913--921},
url = {http://dx.doi.org/10.1111/j.1365-246x.2012.05525.x},
doi = {10.1111/j.1365-246X.2012.05525.x}
}
|
| Barani S, Scafidi D and Eva C (2010), "Strain rates in northwestern Italy from spatially smoothed seismicity", Journal of Geophysical Research: Solid Earth., jul, 2010. Vol. 115(B7), pp. 1-16. Wiley-Blackwell. |
| Abstract: This work presents seismic strain rate maps for the Western Alps and Northern Apennines (northern Italy) as derived from an earthquake catalog collecting both historical and instrumental data. Strain rates are calculated on the basis of the rate of seismic moment release using the Anderson method. Unlike previous applications, which determined the total strain rate associated with specific seismogenic sources, we have employed an innovative zoneless approach based on a spatially smoothed seismicity method. In addition, a Monte Carlo simulation procedure is applied to allow for uncertainty in the input data (e.g., magnitude to moment conversion, seismogenic thickness, maximum earthquake magnitude). Strain rate maps are developed by summing the moments of the earthquakes reported in the catalog and by using two different earthquake recurrence relations. Our results indicate that deformation rates are quite high, ranging from about 2 to 12 × 10&8722;9 yr&8722;1 in the Northern Apennines and from 0.5 to 6 × 10&8722;9 yr&8722;1 in the Western Alps. These values, however, are &8764;1 order less than those derived from Global Positioning System measurements, suggesting that a portion of the recent deformation in northwestern Italy is related to aseismic processes. The discrepancies between seismic and geodetic strain rates may also indicate that the record of seismicity may not provide a sufficient time window for assessment of secular rates of moment release (or secular deformation rates) and rates of recurrence of large magnitude earthquakes in the study area. |
BibTeX:
@article{Barani_2010,
author = {Barani, Simone and Scafidi, Davide and Eva, Claudio},
title = {Strain rates in northwestern Italy from spatially smoothed seismicity},
journal = {Journal of Geophysical Research: Solid Earth},
publisher = {Wiley-Blackwell},
year = {2010},
volume = {115},
number = {B7},
pages = {1--16},
url = {http://dx.doi.org/10.1029/2009jb006637},
doi = {10.1029/2009JB006637}
}
|
| Barba S, Carafa MMC, Mariucci MT, Montone P and Pierdominici S (2010), "Present-day stress-field modelling of southern Italy constrained by stress and GPS data", Tectonophysics., feb, 2010. Vol. 482(1-4), pp. 193-204. Elsevier BV. |
| Abstract: The present-day tectonic setting of the Italian peninsula is very complex and involves competing geodynamic processes. In this context, southern peninsular Italy is characterised by extension along the Apenninic belt and in the Tyrrhenian margin and by transpression in the Apulia-Gargano region. The extension is well defined by means of geological, seismological, and contemporary stress data. For the latter only few data are available in the Apulia-Gargano region, leaving the state of stress in that area unresolved. Here we develop a finite-element model of the southern Italian region in order to predict the contemporary stress field. Our model predictions are constrained by model-independent observations of the orientation of maximum horizontal stress (SHmax), the tectonic regime, and the horizontal velocities derived from GPS observations. We performed a blind test with 31 newly acquired SHmax orientations in the Southern Apennines. These new data come from the analysis of orehole breakouts performed in 46 deep oil exploration wells ranging in depth from 1300 to 5500 m. The model results agree with the stress data that define a prevailing NW-SE SHmax orientation along the Apenninic belt and foredeep and thus are capable to predict the stress field where no stress information is available. We first analyse how much model predictions, based on older data, deviate from present-day stress data and then recalibrate the models based on our new stress data, giving insight into the resolution of both models and data. In the studied region, which is affected by low deformation rates, we find that geodetic data alone cannot resolve such low levels of deformation due to the high relative measurement errors. We conclude that both GPS and stress data are required to constrain model results. ?? 2009 Elsevier B.V. All rights reserved. |
BibTeX:
@article{Barba_2010,
author = {Barba, Salvatore and Carafa, Michele M C and Mariucci, Maria Teresa and Montone, Paola and Pierdominici, Simona},
title = {Present-day stress-field modelling of southern Italy constrained by stress and GPS data},
journal = {Tectonophysics},
publisher = {Elsevier BV},
year = {2010},
volume = {482},
number = {1-4},
pages = {193--204},
url = {http://dx.doi.org/10.1016/j.tecto.2009.10.017},
doi = {10.1016/j.tecto.2009.10.017}
}
|
| Bennett RA and Hreinsdóttir S (2007), "Constraints on vertical crustal motion for long baselines in the central Mediterranean region using continuous GPS", Earth and Planetary Science Letters., may, 2007. Vol. 257(3-4), pp. 419-434. |
| Abstract: GPS-determination of vertical crustal velocity relative to a globally defined reference frame is limited by the accuracy of the reference frame origin and scale. However, the precision of relative vertical rates at regional-distance scales remains largely unexplored. We investigated the precision of regional-scale vertical velocity estimates using data from seven continuously operating GPS stations located in the central Mediterranean. The stations form a network of aperture ??? 500??km and each has been in operation for at least 5??yr. We used published constraints on recent crustal uplift inferred from late Quaternary shoreline data to aid in the definition of a local vertical reference frame for GPS rates to facilitate an assessment of GPS vertical precision. We explored different methods of defining the local reference frame. The simplest method involves the estimation of a single scalar translation parameter. Adjusting the reference frame by this simple method yields agreement between CGPS and Holocene shoreline data sets at the level of 0.2 to 0.4??mm/yr. Relative rates determined using CGPS are also consistent with tide gauge records and sea level determined by satellite altimetry at the level of about 0.2??mm/yr. These results suggest that regional-scale relative velocity precision well below the mm/yr-level is now possible using continuous GPS. ?? 2007 Elsevier B.V. All rights reserved. |
BibTeX:
@article{2007E&PSL.257..419B,
author = {Bennett, Richard A. and Hreinsdóttir, Sigrún},
title = {Constraints on vertical crustal motion for long baselines in the central Mediterranean region using continuous GPS},
journal = {Earth and Planetary Science Letters},
year = {2007},
volume = {257},
number = {3-4},
pages = {419--434},
doi = {10.1016/j.epsl.2007.03.008}
}
|
| Bennitt GV and Jupp A (2012), "Operational Assimilation of GPS Zenith Total Delay Observations into the Met Office Numerical Weather Prediction Models", Monthly Weather Review., aug, 2012. Vol. 140(8), pp. 2706-2719. American Meteorological Society. |
BibTeX:
@article{Bennitt_2012,
author = {Bennitt, Gemma V. and Jupp, Adrian},
title = {Operational Assimilation of GPS Zenith Total Delay Observations into the Met Office Numerical Weather Prediction Models},
journal = {Monthly Weather Review},
publisher = {American Meteorological Society},
year = {2012},
volume = {140},
number = {8},
pages = {2706--2719},
url = {http://journals.ametsoc.org/doi/abs/10.1175/MWR-D-11-00156.1},
doi = {10.1175/MWR-D-11-00156.1}
}
|
| Boler F, Wier S, Agostino ND, Fernandes RRM, Ganas A and Ofeigsson B (2014), "New Collaboration Among Geodesy Data Centers in Europe and the US Facilitates Data Discovery and Access", In EGU General Assembly Conference Abstracts., may, 2014. Vol. 16, pp. 12385.
[BibTeX] |
BibTeX:
@inproceedings{2014EGUGA..1612385B,
author = {Boler, Fran and Wier, Stuart and Agostino, Nicola D and Fernandes, Rui R M and Ganas, Athanassios and Ofeigsson, Benedikt},
title = {New Collaboration Among Geodesy Data Centers in Europe and the US Facilitates Data Discovery and Access},
booktitle = {EGU General Assembly Conference Abstracts},
year = {2014},
volume = {16},
pages = {12385}
}
|
| Bosy J, Kontny B and Borkowski A (2009), "IGS/EPN reference frame realization in local GPS networks", In International Association of Geodesy Symposia. Vol. 134, pp. 197-203. Springer Science $mathplus Business Media. |
| Abstract: The modern geodetic reference systems (e. g. ITRS) are realized by$nreference frames, i.e. a set of stations with position coordinates at a$nreference epoch and station velocities (e. g. ITRF2000). IGS$n(International GNSS Service) global network and EPN (EUREF Permanent$nNetwork) regional network stations are parametrized in this way. The$nmain IGS/EPN products (gained daily and weekly) are estimated station$ncoordinates and velocities, as well as orbits' and ionospheric and$ntropospheric parameters. The connection of local GPS networks with$nIGS/EPN stations enables to use the above products. In this publication$nthe method of EPN/IGS reference stations selection for the purpose of$nlocal GPS networks is presented. Two approaches are applied: station$nvelocity analysis and cluster analysis. It has also been suggested to$nprocess permanent and epoch observations in local GPS networks, which$nare based on IGS global networks and EPN regional networks' solutions$njointly. |
BibTeX:
@incollection{Bosy_2009,
author = {Bosy, J. and Kontny, B. and Borkowski, A.},
title = {IGS/EPN reference frame realization in local GPS networks},
booktitle = {International Association of Geodesy Symposia},
publisher = {Springer Science $mathplus Business Media},
year = {2009},
volume = {134},
pages = {197--203},
url = {http://dx.doi.org/10.1007/978-3-642-00860-331},
doi = {10.1007/978-3-642-00860-3{\_}31}
}
|
| Caporali A, Aichhorn C, Barlik M, Becker M, Fejes I, Gerhatova L, Ghitau D, Grenerczy G, Hefty J, Krauss S, Medak D, Milev G, Mojzes M, Mulic M, Nardo A, Pesec P, Rus T, Simek J, Sledzinski J, Solaric M, Stangl G, Stopar B, Vespe F and Virag G (2009), "Surface kinematics in the Alpine-Carpathian-Dinaric and Balkan region inferred from a new multi-network GPS combination solution", Tectonophysics., sep, 2009. Vol. 474(1-2), pp. 295-321. Elsevier BV. |
| Abstract: The understanding of the intraplate tectonics of Central Europe requires a detailed picture of how stress is transferred from the interaction of the Eurasian, Nubian and Anatolian plates to the Alpine, Carpathian, Pannonian and Dinaric regions. Recent strain distribution is controlled by the Adria horizontal push, by the Vrancea vertical slab pull and associated horizontal displacements, and by the Aegean/Anatolia extension and slab-roll back. We present a horizontal velocity field for the Alpine-Carpathian-Pannonic-Dinaric and Balkan regions resulting from a new combination of seven different GPS networks formed from permanent and campaign stations. Dedicated velocity profiles in two specific regions are studied in detail. One is the Alpine Pannonian region, with a detailed picture of the NS indentation of the Adria microplate into the Southern Alps, in NE Italy, the deformation in the Tauern Window and the eastwards kinematics of a Pannonian plate fragment. The second study region includes Transylvania, the Southern Carpathians up to the Aegean sea and Albania, where a major right lateral shear deformation exists as a consequence of the NE convergence of the Apulia platform towards the Dinarids, and the SSW motion of Macedonia, Western Bulgaria and Rumania, related to the Hellenic arc dynamics in the Eastern Mediterranean. The profiles in the Alpine-Pannonian area indicate that a velocity drop of 2.5 +/- 0.4 mm/yr associated with the Adria indentation concentrates on a segment of some 50 km south of the Periadriatic fault. The deformation becomes extensional by a similar amount just north of the Periadriatic fault, in the Tauern Window, where the updoming of the Tauern Window implies vertical motion which could well be associated with surface extension. In the EW profile, we observe a sudden velocity change of 1.5 +/- 0.2 mm/yr in 20 km, corresponding to the right lateral Lavant fault, which seems to mark the border between dominant indentation kinematics to the West and dominant extrusion kinematics to the East. Three profiles are considered in Southern and Eastern Europe: one across the lower Adriatic sea from Apulia in Italy to the southern Dinarides, which enables it to constrain the velocity drop associated with the subduction of the Adria microplate into the Dinarides to 3.2 +/- 0.5 mm/yr in 140 km. The second profile is longitudinal and constrains the velocity inversion of 7.4 +/- 1.0 mm/yr in 350 km associated with right lateral shear faults in Albania. The third profile crosses the Transylvania region with a shortening of 2.3 +/- 1.0 mm/yr in 220 km, and the Wallachian-Moesian region up to the Chalcidic peninsula in N Greece. This lower part of the profile implies an extensional stretch of the upper crust of 3.2 +/- 0.9 mm/yr in 440 km, culminating in the Hellenic arc. Strain rate maps are presented in this regional scale, showing the excellent agreement between fault plane solutions of crustal earthquakes and the eigenvectors of the GPS derived two dimensional strain rate tensor. Three profiles are considered in the Balkan and SE Carpathians: one across the lower Adriatic sea from Apulia in Italy to the southern Dinarides, which enables to constrain the velocity drop associated to the subduction of the Adria microplate into the Dinarides to 3.2 +/- 0.5??mm/yr in 140??km. The second profile is longitudinal and constrains the velocity inversion of 7.4 +/- 1.0??mm/yr in 350??km associated to right lateral shear faults in Macedonia, a highly seismic region. The third profile crosses the Transylvania with a shortening2.3 +/- 1.0??mm/yr in 220??km, and the Wallachian-Moesian region up to the Chalcidic peninsula in N Greece. This lower part of the profile implies an extensional stretch of the upper crust of 3.2 +/- 0.9??mm/yr in 440??km, culminating in the Hellenic arc. ?? 2009 Elsevier B.V. All rights reserved. |
BibTeX:
@article{Caporali_2009,
author = {Caporali, A. and Aichhorn, C. and Barlik, M. and Becker, M. and Fejes, I. and Gerhatova, L. and Ghitau, D. and Grenerczy, G. and Hefty, J. and Krauss, S. and Medak, D. and Milev, G. and Mojzes, M. and Mulic, M. and Nardo, A. and Pesec, P. and Rus, T. and Simek, J. and Sledzinski, J. and Solaric, M. and Stangl, G. and Stopar, B. and Vespe, F. and Virag, G.},
title = {Surface kinematics in the Alpine-Carpathian-Dinaric and Balkan region inferred from a new multi-network GPS combination solution},
journal = {Tectonophysics},
publisher = {Elsevier BV},
year = {2009},
volume = {474},
number = {1-2},
pages = {295--321},
url = {http://dx.doi.org/10.1016/j.tecto.2009.04.035},
doi = {10.1016/j.tecto.2009.04.035}
}
|
| Cenni N, Viti M, Baldi P, Mantovani E, Bacchetti M and Vannucchi A (2013), "Present vertical movements in Central and Northern Italy from GPS data: Possible role of natural and anthropogenic causes", Journal of Geodynamics., nov, 2013. Vol. 71, pp. 74-85. Elsevier BV. |
| Abstract: Insights into the present vertical kinematic pattern in Central and Northern Italy are gained by the analysis of GPS data acquired by a network of 262 permanent stations, working over various time intervals since 2001. Uplift is observed in the Alps (up to 5. mm/yr) and Apennines (1-2. mm/yr), whereas subsidence is recognized in the southern Venetian Plain (2-4. mm/yr) and the eastern Po Valley, where the highest rates are observed (up to 9. mm/yr between Reggio Emilia and Rimini). On the other hand, the western part of the Po Valley presents very low vertical rates. The boundary between subsiding and not subsiding Po Valley nearly corresponds to the Giudicarie tectonic discontinuity. It is argued that the different kinematic patterns of the eastern and western Padanian sectors may also be related to the underthrusting of the eastern domain beneath the western one. Some considerations are then reported on how the various causes of vertical movements (tectonic and sedimentological processes) may contribute to the observed kinematics. © 2013 Elsevier Ltd. |
BibTeX:
@article{Cenni_2013,
author = {Cenni, N. and Viti, M. and Baldi, P. and Mantovani, E. and Bacchetti, M. and Vannucchi, A.},
title = {Present vertical movements in Central and Northern Italy from GPS data: Possible role of natural and anthropogenic causes},
journal = {Journal of Geodynamics},
publisher = {Elsevier BV},
year = {2013},
volume = {71},
pages = {74--85},
url = {http://dx.doi.org/10.1016/j.jog.2013.07.004},
doi = {10.1016/j.jog.2013.07.004}
}
|
| Champagnac JD, Schlunegger F, Norton K, von Blanckenburg F, Abbühl LM and Schwab M (2009), "Erosion-driven uplift of the modern Central Alps", Tectonophysics., sep, 2009. Vol. 474(1-2), pp. 236-249. Elsevier BV. |
| Abstract: We present a compilation of data of modern tectono-geomorphic processes in the Central European Alps which suggest that observed rock uplift is a response to climate-driven denudation. This interpretation is predominantly based on the recent quantification of basin-averaged Late Holocene denudation rates that are so similar to the pattern and rates of rock uplift rates as determined by geodetic leveling. Furthermore, a GPS data-based synthesis of Adriatic microplate kinematics suggests that the Central Alps are currently not in a state of active convergence. Finally, we illustrate that the Central Alps have acted as a closed system for Holocene redistribution of sediment in which the peri-Alpine lakes have operated as a sink for the erosional products of the inner Central Alps. While various hypotheses have been put forward to explain Central Alpine rock uplift (e.g. lithospheric forcing by convergence, mantle processes, or ice melting) we show with an elastic model of lithospheric deformation, that the correlation between erosion and rock uplift rates reflects a positive feedback between denudation and the associated isostatic response to unloading. Thus, erosion does not passively respond to advection of crustal material as might be the case in actively converging orogens. Rather, we suggest that the geomorphic response of the Alpine topography to glacial and fluvial erosion and the resulting disequilibrium for modern channelized and associated hillslope processes explains much of the pattern of modern denudation and hence rock uplift. Therefore, in a non-convergent orogen such as the Central European Alps, the observed vertical rock uplift is primarily a consequence of passive unloading due to erosion. © 2009 Elsevier B.V. All rights reserved. |
BibTeX:
@article{Champagnac_2009,
author = {Champagnac, Jean Daniel and Schlunegger, Fritz and Norton, Kevin and von Blanckenburg, Friedhelm and Abbühl, Luca M. and Schwab, Marco},
title = {Erosion-driven uplift of the modern Central Alps},
journal = {Tectonophysics},
publisher = {Elsevier BV},
year = {2009},
volume = {474},
number = {1-2},
pages = {236--249},
url = {http://dx.doi.org/10.1016/j.tecto.2009.02.024},
doi = {10.1016/j.tecto.2009.02.024}
}
|
| Cushing EM, Bellier O, Nechtschein S, Sébrier M, Lomax A, Volant PH, Dervin P, Guignard P and Bove L (2008), "A multidisciplinary study of a slow-slipping fault for seismic hazard assessment: The example of the Middle Durance Fault (SE France)", Geophysical Journal International., mar, 2008. Vol. 172(3), pp. 1163-1178. |
| Abstract: Assessing seismic hazard in continental interiors is difficult because these regions are characterized by low strain rates and may be struck by infrequent destructive earthquakes. In this paper, we provide an example showing that interpretations of seismic cross sections combined with other kinds of studies such as analysis of microseismicity allow the whole seismogenic source area to be imaged in this type of region. The Middle Durance Fault (MDF) is an 80-km-long fault system located southeastern France that has a moderate but regular seismicity and some palaeoseismic evidence for larger events. It behaves as an oblique ramp with a left-lateral-reverse fault slip and has a low strain rate. MDF is one of the rare slow active fault system monitored by a dedicated dense velocimetric short period network. This study showed a fault system segmented in map and cross section views which consists of staircase basement faults topped by listric faults ramping off Triassic evaporitic beds. Seismic sections allowed the construction of a 3-D structural model used for accurate location of microseismicity. Southern part of MDF is mainly active in the sedimentary cover. In its northern part and in Alpine foreland, seismicity deeper than 8 km was also recorded meaning active faults within the crust cannot be excluded. Seismogenic potential of MDF was roughly assessed. Resulting source sizes and estimated slip rates imply that the magnitude upper limit ranges from 6.0 to 6.5 with a return period of a few thousand years. The present study shows that the coupling between 3-D fault geometry imaging and accurate location of microseismicity provides a robust approach to analyse active fault sources and consequently a more refined seismic hazard assessment. © 2007 The Authors Journal compilation © 2007 RAS. |
BibTeX:
@article{2008GeoJI.172.1163C,
author = {Cushing, E. M. and Bellier, O. and Nechtschein, S. and Sébrier, M. and Lomax, A. and Volant, P. H. and Dervin, P. and Guignard, P. and Bove, L.},
title = {A multidisciplinary study of a slow-slipping fault for seismic hazard assessment: The example of the Middle Durance Fault (SE France)},
journal = {Geophysical Journal International},
year = {2008},
volume = {172},
number = {3},
pages = {1163--1178},
doi = {10.1111/j.1365-246X.2007.03683.x}
}
|
| D'Agostino N, Avallone A, Cheloni D, D'Anastasio E, Mantenuto S and Selvaggi G (2008), "Active tectonics of the Adriatic region from GPS and earthquake slip vectors", Journal of Geophysical Research: Solid Earth., dec, 2008. Vol. 113(12), pp. B12413. |
| Abstract: To investigate the kinematics of the Adriatic region, we integrate continuous and episodic GPS measurements with M w > 4.5 earthquake slip vectors selected from the Regional Centroid Moment Tensor catalogue. Coherent motion of GPS sites in the Po Valley, in Apulia, and in the Hyblean Plateau allows us to estimate geodetically constrained angular velocities for these regions. The predictions of the GPS-inferred angular velocities are compared with the earthquake slip vectors, showing that the seismically expressed deformation at the microplate boundaries is consistent with the observed geodetic motion. The remarkable consistency between geodetic, seismological, and geological evidence of active tectonics suggests that active deformation in the central Adriatic is controlled by the relative motion between the Adria and Apulia microplates. The microplates' angular rotation rates are then compared with the rotation rates calculated with a simple block model supporting the hypotheses (1) that Apulia forms a single microplate with the Ionian Sea and possibly with the Hyblean region and (2) that Adria and Apulia rotate in such a way as to accommodate the Eurasia-Nubia relative motion. We suggest that the present-day microplate configuration follows a recent fragmentation of the Adriatic promontory that during the Neogene rigidly transferred the Africa motion to the orogenic belts that now surround the Adriatic region. |
BibTeX:
@article{2008JGRB..11312413D,
author = {D'Agostino, N. and Avallone, A. and Cheloni, D. and D'Anastasio, E. and Mantenuto, S. and Selvaggi, G.},
title = {Active tectonics of the Adriatic region from GPS and earthquake slip vectors},
journal = {Journal of Geophysical Research: Solid Earth},
year = {2008},
volume = {113},
number = {12},
pages = {B12413},
doi = {10.1029/2008JB005860}
}
|
| D'Agostino N, Mantenuto S, D'Anastasio E, Avallone A, Barchi M, Collettini C, Radicioni F, Stoppini A and Fastellini G (2009), "Contemporary crustal extension in the Umbria-Marche Apennines from regional CGPS networks and comparison between geodetic and seismic deformation", Tectonophysics., oct, 2009. Vol. 476(1-2), pp. 3-12. Elsevier BV. |
| Abstract: Here we report the results of the analysis of a GPS velocity field in the Umbria-Marche Apennines (central Italy) obtained from the integration of diverse geodetic networks. The velocity field obtained shows a high degree of consistency both spatially and in terms of comparison with independent information, despite the limited time span of some GPS stations. Starting from the velocity field we derive a continuous strain rate field applying a spline interpolation technique which provide a smooth estimate of the deformation field. The main feature of the resulting strain rate field is a continuous high (>50 nanostrain/year) strain rate belt coincident with the area of largest historical and instrumental seismic release. The model directions of the principal axes agree with geological and seismological information indicating NE-SW extension. We transform the strain rate field into geodetic moment rate using the Kostrov formula to evaluate the potential seismic activity of the region and compare it with actual seismic release in the last 720 years from Mw>5.5 earthquakes. This comparison highlights a large possible deficit in the seismic release with respect to the overall potential seismic activity, particularly concentrated in the northern part of the study area. This discrepancy can be resolved with either a large amount of seismicity to be released in the near future or significant aseismic slip and deformation. ?? 2008 Elsevier B.V. All rights reserved. |
BibTeX:
@article{D_Agostino_2009,
author = {D'Agostino, N. and Mantenuto, S. and D'Anastasio, E. and Avallone, A. and Barchi, M. and Collettini, C. and Radicioni, F. and Stoppini, A. and Fastellini, G.},
title = {Contemporary crustal extension in the Umbria-Marche Apennines from regional CGPS networks and comparison between geodetic and seismic deformation},
journal = {Tectonophysics},
publisher = {Elsevier BV},
year = {2009},
volume = {476},
number = {1-2},
pages = {3--12},
url = {http://dx.doi.org/10.1016/j.tecto.2008.09.033},
doi = {10.1016/j.tecto.2008.09.033}
}
|
| David M, Sojka JJ, Schunk RW and Coster AJ (2016), "Polar cap patches and the tongue of ionization: A survey of GPS TEC maps from 2009 to 2015", Geophysical Research Letters., mar, 2016. Vol. 43(6), pp. 2422-2428. |
| Abstract: The source and structuring mechanisms for F region density patches have been subjects of speculation and debate for many years. We have made a survey of mappings of total electron content (TEC) between the years 2009 and 2015 from the web-based Madrigal data server in order to determine when patches and/or a tongue of ionization (TOI) have been present in the Northern Hemisphere polar cap; we find that there is a UT and seasonal dependence that follows a specific pattern. This finding sheds considerable light upon the old question of the source of polar cap patches, since it virtually eliminates potential patch plasma sources that do not have a UT/seasonal dependence, for example, particle precipitation or flux transfer events. We also find that the frequency of occurrence of patches or TOIs has little to do with the level of geomagnetic activity. |
BibTeX:
@article{2016GeoRL..43.2422D,
author = {David, Michael and Sojka, J. J. and Schunk, R. W. and Coster, A. J.},
title = {Polar cap patches and the tongue of ionization: A survey of GPS TEC maps from 2009 to 2015},
journal = {Geophysical Research Letters},
year = {2016},
volume = {43},
number = {6},
pages = {2422--2428},
doi = {10.1002/2016GL068136}
}
|
| Devoti R, Esposito A, Pietrantonio G, Pisani AR and Riguzzi F (2011), "Evidence of large scale deformation patterns from GPS data in the Italian subduction boundary", Earth and Planetary Science Letters., nov, 2011. Vol. 311(3-4), pp. 230-241. Elsevier BV. |
| Abstract: We present the velocity field in Italy derived from over 300 continuous GPS stations operated in the 1998-2009 time span. The GPS network maps the whole country with a mean inter-site distance of about 50km and provides a valuable source of data to study the ongoing deformation processes in the central Mediterranean. The estimated horizontal and vertical velocity fields show major significant features and also less known second-order kinematic features. A general uplift characterizes the whole Apennines and Alpine belts that follow the topographic ridge, whereas the Po Plain shows a gradually increasing subsidence from west to east. The Apennines belt displays a distinctive extension (50-80 10-9yr-1) while compressive tectonic regimes characterize northern Sicily, eastern Alps and the northeast front of the northern Apennines (25-50 10-9yr-1). Second-order deformation patterns, on large scale wavelength (100km) have been detected on the accretionary prism of central and southern Apennines that are highly correlated with other geophysical data (Vp anomalies, seismic anisotropy, etc.) and related to deep rooted sections (70-100km), marked by different subduction regimes. Apparently at this scale-length the observed deformations are governed by the lithosphere as a whole. We interpret these deformations as a result of different subduction mechanisms, such as variations of the subduction rollback velocity affecting different segments of the subduction zone and/or to mantle flows in proximity of the slab edges. Further south, in central-southern Sicily, we detect a contraction of (-1.1±0.2) mm/yr that probably accommodates part of the Africa-Eurasia convergence on the outer thrust front of the Apennines-Maghrebides belt. This hypothesis agrees with an independent analysis of the seismicity associated to the Sicilian Basal Thrust, thought to be still active. The ITRF2005 estimates of the new GPS velocity field are available also in SINEX format as supplementary file S1. © 2011 Elsevier B.V. |
BibTeX:
@article{Devoti_2011,
author = {Devoti, Roberto and Esposito, Alessandra and Pietrantonio, Grazia and Pisani, Anna Rita and Riguzzi, Federica},
title = {Evidence of large scale deformation patterns from GPS data in the Italian subduction boundary},
journal = {Earth and Planetary Science Letters},
publisher = {Elsevier BV},
year = {2011},
volume = {311},
number = {3-4},
pages = {230--241},
url = {http://dx.doi.org/10.1016/j.epsl.2011.09.034},
doi = {10.1016/j.epsl.2011.09.034}
}
|
| Doulkeridis C, Vlachou A, Kotidis Y and Vazirgiannis M (2007), "Peer-to-peer similarity search in metric spaces", In Proceedings of the 33rd international conference on Very Large Databases., dec, 2007. Vol. 2(iii), pp. 986-997. Springer Science $mathplus Business Media. |
| Abstract: This paper addresses the efficient processing of similarity queries in metric spaces, where data is horizontally distributed across a P2P network. The proposed approach does not rely on arbitrary data movement, hence each peer joining the network autonomously ... |
BibTeX:
@incollection{Pinedo_2011,
author = {Doulkeridis, Christos and Vlachou, Akrivi and Kotidis, Yannis and Vazirgiannis, Michalis},
title = {Peer-to-peer similarity search in metric spaces},
booktitle = {Proceedings of the 33rd international conference on Very Large Databases},
publisher = {Springer Science $mathplus Business Media},
year = {2007},
volume = {2},
number = {iii},
pages = {986--997},
url = {http://portal.acm.org/citation.cfm?id=1325851.1325962},
doi = {10.1007/978-1-4614-}
}
|
| Feng G, Jin S and Zhang T (2013), "Coastal sea level changes in Europe from GPS, tide gauge, satellite altimetry and GRACE, 1993-2011", Advances in Space Research., mar, 2013. Vol. 51(6), pp. 1019-1028. Elsevier BV. |
| Abstract: Sea level changes are threatening the human living environments, particularly along the European Coasts with highly dense population. In this paper, coastal sea level changes in western and southern Europe are investigated for the period 1993-2011 using Global Positioning System (GPS), Tide Gauge (TG), Satellite Altimetry (SA), Gravity Recovery and Climate Experiment (GRACE) and geophysical models. The mean secular trend is 2.26 ± 0.52 mm/y from satellite altimetry, 2.43 ± 0.61 mm/y from TG+GPS and 1.99 ± 0.67 mm/y from GRACE mass plus steric components, which have a remarkably good agreement. For the seasonal variations, annual amplitudes of satellite altimetry and TG+GPS results are almost similar, while GRACE Mass+Steric results are a little smaller. The annual phases agree remarkably well for three independent techniques. The annual cycle is mainly driven by the steric contributions, while the annual phases of non-steric (mass component) sea level changes are almost a half year later than the steric sea level changes. |
BibTeX:
@article{Feng_2013,
author = {Feng, Guiping and Jin, S. and Zhang, T.},
title = {Coastal sea level changes in Europe from GPS, tide gauge, satellite altimetry and GRACE, 1993-2011},
journal = {Advances in Space Research},
publisher = {Elsevier BV},
year = {2013},
volume = {51},
number = {6},
pages = {1019--1028},
url = {http://dx.doi.org/10.1016/j.asr.2012.09.011},
doi = {10.1016/j.asr.2012.09.011}
}
|
| Fuhrmann T, Caro Cuenca M, Knopfler A, van Leijen F, Mayer M, Westerhaus M, Hanssen R and Heck B (2015), "Combining InSAR Leveling and GNSS for the Estimation of 3D Surface Displacements", In FRINGE 2015., may, 2015. Vol. 731, pp. 8.
[BibTeX] |
BibTeX:
@inproceedings{2015ESASP.731E...8F,
author = {Fuhrmann, T and Caro Cuenca, M and Knopfler, A and van Leijen, F.J. and Mayer, M and Westerhaus, M and Hanssen, R.F. and Heck, B},
title = {Combining InSAR Leveling and GNSS for the Estimation of 3D Surface Displacements},
booktitle = {FRINGE 2015},
year = {2015},
volume = {731},
pages = {8}
}
|
| Fuhrmann T, Luo X, Knöpfler A and Mayer M (2014), "Generating statistically robust multipath stacking maps using congruent cells", GPS Solutions., feb, 2014. Vol. 19(1), pp. 83-92. Springer Science $mathplus Business Media. |
| Abstract: Multipath effects caused by reflections in the near-field and far-field of a GNSS antenna represent a major error source in static and kinematic GNSS positioning applications. Since these effects are strongly site-specific, a generally valid and practicable analytical multipath model is still lacking. In contrast, using GNSS carrier phase observation residuals, the multipath stacking (MPS) methods are able to take site-specific conditions into account. We propose an advanced approach to performing residual-based MPS in the space domain. Being superior to most conventional attempts in which stacking cells have a fixed azimuthal resolution, our suggested method makes use of congruent cells and rigorous statistical assessments in terms of outlier detection and significance evaluation of the stacked values. The advanced stacking approach is applied to representative phase residuals from static precise point positioning. The results show that the use of congruent cells allows for MPS at high elevation angles and with a fine spatial resolution. Applying the resulting MPS maps at the residual level, both near-field and far-field effects at high and low elevation angles, respectively, can be significantly mitigated. In comparison with the conventional approach, the advanced one enables a larger reduction of about 20 % in the SD of residuals. |
BibTeX:
@article{Fuhrmann_2014,
author = {Fuhrmann, Thomas and Luo, Xiaoguang and Knöpfler, Andreas and Mayer, Michael},
title = {Generating statistically robust multipath stacking maps using congruent cells},
journal = {GPS Solutions},
publisher = {Springer Science $mathplus Business Media},
year = {2014},
volume = {19},
number = {1},
pages = {83--92},
url = {http://dx.doi.org/10.1007/s10291-014-0367-7},
doi = {10.1007/s10291-014-0367-7}
}
|
| Garate J, Martin-Davila J, Khazaradze G, Echeverria A, Asensio E, Gil AJ, de Lacy MC, Armenteros JA, Ruiz AM, Gallastegui J, Alvarez-Lobato F, Ayala C, Rodrguez-Caderot G, Galindo-Zaldvar J, Rimi A and Harnafi M (2015), "Topo-Iberia project: CGPS crustal velocity field in the Iberian Peninsula and Morocco", GPS Solutions., jun, 2015. Vol. 19(2), pp. 287-295. Springer Science $mathplus Business Media. |
| Abstract: A new Continuous GPS network was installed under the umbrella of a Research Project called “Geociencias en Iberia: Estudios integrados de topografa y evolución 4D (Topo-Iberia)”, to improve understanding of kinematic behavior of the Iberian Peninsula region. Here we present a velocity field based on the analysis of the four years of data from the 25 stations constituting the network, which were analyzed by three different analysis groups contributing to the project. Different geodetic software packages (GIPSY–OASIS, Bernese and GAMIT) as well as different approaches were used to estimate rates of present-day crustal deformation in the Iberian Peninsula and Morocco. In order to ensure the consistency of the velocity fields determined by the three groups, the velocities obtained by each Analysis Centre were transformed into a common Eurasia Reference Frame. After that, the strain rate field was calculated. The results put in evidence more prominent residual motions in Morocco and southern-most part of the Iberian Peninsula. In particular, the dilatation and shear strain rates reach their maximum values in the central Betics and northern Alboran Sea. A small region of high shear strain rate is observed in the east-central part of the peninsula and another deformation focus is located around the Strait of Gibraltar and the Gulf of Cadiz. |
BibTeX:
@article{Garate_2014,
author = {Garate, J. and Martin-Davila, J. and Khazaradze, G. and Echeverria, A. and Asensio, E. and Gil, A. J. and de Lacy, M. C. and Armenteros, J. A. and Ruiz, A. M. and Gallastegui, J. and Alvarez-Lobato, F. and Ayala, C. and Rodrguez-Caderot, G. and Galindo-Zaldvar, J. and Rimi, A. and Harnafi, M.},
title = {Topo-Iberia project: CGPS crustal velocity field in the Iberian Peninsula and Morocco},
journal = {GPS Solutions},
publisher = {Springer Science $mathplus Business Media},
year = {2015},
volume = {19},
number = {2},
pages = {287--295},
url = {http://dx.doi.org/10.1007/s10291-014-0387-3},
doi = {10.1007/s10291-014-0387-3}
}
|
| Garcia R and Crespon F (2008), "Radio tomography of the ionosphere: Analysis of an underdetermined, ill-posed inverse problem, and regional application", Radio Science., apr, 2008. Vol. 43(2), pp. n/a-n/a. |
| Abstract: After analysing the forward and inverse problems of radio tomography, a time varying three-dimensional imaging method of the ionosphere from GPS slant TEC data is described and applied at regional scale. Our approach is based on local basis parametrisation of electron density, and constrained by NeQuick ionosphere model and its spatial gradients. Our inversion scheme is fundamentally different from the data assimilation approach because it is not based on a physical ionosphere model. Preliminary results obtained with European GPS receiver data validate the stability of our method which is able to retrieve small-scale ionosphere features in properly resolved volumes. Many improvements are still possible on the algorithm, and a careful validation of inverted models by independent data is still necessary. However, our inversion algorithm is shown to improve the determination of the small-scale features of a coarse a priori ionosphere model. |
BibTeX:
@article{2008RaSc...43.2014G,
author = {Garcia, R and Crespon, F},
title = {Radio tomography of the ionosphere: Analysis of an underdetermined, ill-posed inverse problem, and regional application},
journal = {Radio Science},
year = {2008},
volume = {43},
number = {2},
pages = {n/a--n/a},
url = {http://doi.wiley.com/10.1029/2007RS003714},
doi = {10.1029/2007RS003714}
}
|
| Jin R, Jin S and Feng G (2012), "MDCB: Matlab code for estimating GNSS satellite and receiver differential code biases", GPS Solutions., jul, 2012. Vol. 16(4), pp. 541-548. Springer Science $mathplus Business Media. |
| Abstract: Global navigation satellite systems (GNSS) have been widely used to monitor variations in the earth's ionosphere by estimating total electron content (TEC) using dual-frequency observations. Differential code biases (DCBs) are one of the important error sources in estimating precise TEC from GNSS data. The International GNSS Service (IGS) Analysis Centers have routinely provided DCB estimates for GNSS satellites and IGS ground receivers, but the DCBs for regional and local network receivers are not provided. Furthermore, the DCB values of GNSS satellites or receivers are assumed to be constant over 1 day or 1 month, which is not always the case. We describe Matlab code to estimate GNSS satellite and receiver DCBs for time intervals from hours to days; the software is called MDCB. The DCBs of GNSS satellites and ground receivers are tested and evaluated using data from the IGS GNSS network. The estimates from MDCB show good agreement with the IGS Analysis Centers with a mean difference of less than 0. 7 ns and an RMS of less than 0. 4 ns, even for a single station DCB estimate. © 2012 Springer-Verlag. |
BibTeX:
@article{Jin_2012,
author = {Jin, Rui and Jin, Shuanggen and Feng, Guiping},
title = {MDCB: Matlab code for estimating GNSS satellite and receiver differential code biases},
journal = {GPS Solutions},
publisher = {Springer Science $mathplus Business Media},
year = {2012},
volume = {16},
number = {4},
pages = {541--548},
url = {http://dx.doi.org/10.1007/s10291-012-0279-3},
doi = {10.1007/s10291-012-0279-3}
}
|
| King MA, Keshin M, Whitehouse PL, Thomas ID, Milne G and Riva REM (2012), "Regional biases in absolute sea-level estimates from tide gauge data due to residual unmodeled vertical land movement", Geophysical Research Letters., jul, 2012. Vol. 39(14), pp. n/a--n/a. Wiley-Blackwell. |
| Abstract: The only vertical land movement signal routinely corrected for when estimating absolute sea-level change from tide gauge data is that due to glacial isostatic adjustment (GIA). We compare modeled GIA uplift (ICE-5G + VM2) with vertical land movement at ∼300 GPS stations located near to a global set of tide gauges, and find regionally coherent differences of commonly ±0.5–2 mm/yr. Reference frame differences and signal due to present-day mass trends cannot reconcile these differences. We examine sensitivity to the GIA Earth model by fitting to a subset of the GPS velocities and find substantial regional sensitivity, but no single Earth model is able to reduce the disagreement in all regions. We suggest errors in ice history and neglected lateral Earth structure dominate model-data differences, and urge caution in the use of modeled GIA uplift alone when interpreting regional- and global- scale absolute (geocentric) sea level from tide gauge data. |
BibTeX:
@article{King_2012,
author = {King, Matt A. and Keshin, Maxim and Whitehouse, Pippa L. and Thomas, Ian D. and Milne, Glenn and Riva, Riccardo E M},
title = {Regional biases in absolute sea-level estimates from tide gauge data due to residual unmodeled vertical land movement},
journal = {Geophysical Research Letters},
publisher = {Wiley-Blackwell},
year = {2012},
volume = {39},
number = {14},
pages = {n/a----n/a},
url = {http://dx.doi.org/10.1029/2012gl052348},
doi = {10.1029/2012GL052348}
}
|
| Kreemer C, Blewitt G and Klein EC (2014), "A geodetic plate motion and Global Strain Rate Model", Geochemistry, Geophysics, Geosystems., oct, 2014. Vol. 15(10), pp. 3849-3889. Wiley-Blackwell. |
| Abstract: We present a new global model of plate motions and strain rates in plate boundary zones con- strained by horizontal geodetic velocities. This Global Strain Rate Model (GSRM v.2.1) is a vast improvement over its predecessor both in terms of amount of data input as in an increase in spatial model resolution by factor of ?2.5 in areas with dense data coverage. We determined 6739 velocities from time series of (mostly) continuous GPS measurements; i.e., by far the largest global velocity solution to date. We trans- formed 15,772 velocities from 233 (mostly) published studies onto our core solution to obtain 22,511 veloc- ities in the same reference frame. Care is taken to not use velocities from stations (or time periods) that are affected by transient phenomena; i.e., this data set consists of velocities best representing the interseismic plate velocity. About 14% of the Earth is allowed to deform in 145,086 deforming grid cells (0.25? longitude by 0.2? latitude in dimension). The remainder of the Earth’s surface is modeled as rigid spherical caps repre- senting 50 tectonic plates. For 36 plates we present new GPS-derived angular velocities. For all the plates that can be compared with the most recent geologic plate motion model, we find that the difference in angular velocity is significant. The rigid-body rotations are used as boundary conditions in the strain rate calculations. The strain rate field is modeled using the Haines and Holt method, which uses splines to obtain an self-consistent interpolated velocity gradient tensor field, from which strain rates, vorticity rates, and expected velocities are derived. We also present expected faulting orientations in areas with significant vor- ticity, and update the no-net rotation reference frame associated with our global velocity gradient field. Finally, we present a global map of recurrence times for Mw57.5 characteristic earthquakes. |
BibTeX:
@article{Kreemer_2014,
author = {Kreemer, Corné and Blewitt, Geoffrey and Klein, Elliot C.},
title = {A geodetic plate motion and Global Strain Rate Model},
journal = {Geochemistry, Geophysics, Geosystems},
publisher = {Wiley-Blackwell},
year = {2014},
volume = {15},
number = {10},
pages = {3849--3889},
url = {http://dx.doi.org/10.1002/2014gc005407},
doi = {10.1002/2014GC005407}
}
|
| Mahfouf, Jean-Francois; Ahmed, Furqan; Moll, Patrick; Teferle LN (2015), "Assimilation of zenith total delays in the AROME France convective scale model : a recent assessment", Tellus - Series A: Dynamic Meteorology and Oceanography., feb, 2015. Vol. 67(26106), pp. 1-20. Co-Action Publishing. |
BibTeX:
@article{Mahfouf_2015,
author = {Mahfouf, Jean-Francois; Ahmed, Furqan; Moll, Patrick; Teferle, Leix N.},
title = {Assimilation of zenith total delays in the AROME France convective scale model : a recent assessment},
journal = {Tellus - Series A: Dynamic Meteorology and Oceanography},
publisher = {Co-Action Publishing},
year = {2015},
volume = {67},
number = {26106},
pages = {1--20},
url = {http://dx.doi.org/10.3402/tellusa.v67.26106},
doi = {10.3402/tellusa.v67.26106}
}
|
| Park J, Kil H, Stolle C, Lühr H, Coley WR, Coster A and Kwak YS (2016), "Daytime midlatitude plasma depletions observed by Swarm: Topside signatures of the rocket exhaust", Geophysical Research Letters., mar, 2016. Vol. 43(5), pp. 1802-1809. |
BibTeX:
@article{2016GeoRL..43.1802P,
author = {Park, Jaeheung and Kil, Hyosub and Stolle, Claudia and Lühr, Hermann and Coley, William R. and Coster, Anthea and Kwak, Young Sil},
title = {Daytime midlatitude plasma depletions observed by Swarm: Topside signatures of the rocket exhaust},
journal = {Geophysical Research Letters},
year = {2016},
volume = {43},
number = {5},
pages = {1802--1809},
doi = {10.1002/2016GL067810}
}
|
| Razak KA, Bucksch A, Damen M, van Westen C, Straatsma M and de Jong S (2013), "Characterizing Tree Growth Anomaly Induced by Landslides Using LiDAR", In Landslide Science and Practice. , pp. 235-241. Springer Science $mathplus Business Media. |
BibTeX:
@incollection{Razak_2013,
author = {Razak, Khamarrul A. and Bucksch, Alexander and Damen, Michiel and van Westen, Cees and Straatsma, Menno and de Jong, Steven},
title = {Characterizing Tree Growth Anomaly Induced by Landslides Using LiDAR},
booktitle = {Landslide Science and Practice},
publisher = {Springer Science $mathplus Business Media},
year = {2013},
pages = {235--241},
url = {http://link.springer.com/10.1007/978-3-642-31325-731},
doi = {10.1007/978-3-642-31325-7{\_}31}
}
|
| Razak KA, Straatsma MW, van Westen CJ, Malet JP and de Jong SM (2011), "Airborne laser scanning of forested landslides characterization: Terrain model quality and visualization", Geomorphology., mar, 2011. Vol. 126(1-2), pp. 186-200. Elsevier BV. |
| Abstract: Mapping complex landslides under forested terrain requires an appropriate quality of digital terrain models (DTMs), which preserve small diagnostic features for landslide classification such as primary and secondary scarps, cracks, and displacement structures (flow-type and rigid-type). Optical satellite imagery, aerial photographs and synthetic aperture radar images are less effective to create reliable DTMs under tree coverage. Here, we utilized a very high density airborne laser scanning (ALS) data, with a point density of 140 points m-2 for generating a high quality DTM for mapping landslides in forested terrain in the Barcelonnette region, the Southern French Alps. We quantitatively evaluated the preservation of morphological features and qualitatively assessed the visualization of ALS-derived DTMs. We presented a filter parameterization method suitable for landslide mapping and compared it with two default filters from the hierarchical robust interpolation (HRI) and one default filter from the progressive TIN densification (PTD) method. The results indicate that the vertical accuracy of the DTM derived from the landslide filter is about 0.04m less accurate than that from the PTD filter. However, the landslide filter yields a better quality of the image for the recognition of small diagnostic features as depicted by expert image interpreters. Several DTM visualization techniques were compared for visual interpretation. The openness map visualized in a stereoscopic model reveals more morphologically relevant features for landslide mapping than the other filter products. We also analyzed the minimal point density in ALS data for landslide mapping and found that a point density of more than 6 points m-2 is considered suitable for a detailed analysis of morphological features. This study illustrates the suitability of high density ALS data with an appropriate parameterization for the bare-earth extraction used for landslide identification and characterization in forested terrain. © 2010 Elsevier B.V. |
BibTeX:
@article{Razak_2011,
author = {Razak, K. A. and Straatsma, M. W. and van Westen, C. J. and Malet, J. P. and de Jong, S. M.},
title = {Airborne laser scanning of forested landslides characterization: Terrain model quality and visualization},
journal = {Geomorphology},
publisher = {Elsevier BV},
year = {2011},
volume = {126},
number = {1-2},
pages = {186--200},
url = {http://dx.doi.org/10.1016/j.geomorph.2010.11.003},
doi = {10.1016/j.geomorph.2010.11.003}
}
|
| Rudenko S, Schön N, Uhlemann M and Gendt G (2013), "Reprocessed height time series for GPS stations", Solid Earth., jan, 2013. Vol. 4(1), pp. 23-41. Copernicus GmbH. |
| Abstract: Precise weekly positions of 403 Global Positioning System (GPS) stations located worldwide are obtained by reprocessing GPS data of these stations for the time span from 4 January 1998 until 29 December 2007. The processing algorithms and models used as well as the solution and results obtained are presented. Vertical velocities of 266 GPS stations having a tracking history longer than 2.5 yr are computed; 107 of them are GPS stations located at tide gauges (TIGA observing stations). The vertical velocities calculated in this study are compared with the estimates from the co-located tide gauges and other GPS solutions. The formal errors of the estimated vertical velocities are 0.01–0.80 mm yr−1. The vertical velocities of our solution agree within 1 mm yr−1 with those of the recent solutions (ULR5 and ULR3) of the Université de La Rochelle for about 67–75 per cent of the common stations. Examples of typical behaviour of station height changes are given and interpreted. The derived height time series and vertical motions of continuous GPS at tide gauges stations can be used for correcting the vertical land motion in tide gauge records of sea level changes. |
BibTeX:
@article{Rudenko_2013,
author = {Rudenko, S. and Schön, N. and Uhlemann, M. and Gendt, G.},
title = {Reprocessed height time series for GPS stations},
journal = {Solid Earth},
publisher = {Copernicus GmbH},
year = {2013},
volume = {4},
number = {1},
pages = {23--41},
url = {http://www.solid-earth.net/4/23/2013/},
doi = {10.5194/se-4-23-2013}
}
|
| Sneeuw N, Novák P, Crespi M and Sansó F (2012), "VII Hotine-Marussi Symposium on Mathematical Geodesy: Proceedings of the Symposium in Rome, 6-10 June, 2009", In International Association of Geodesy Symposia. Vol. 137, pp. 39-45. Springer Berlin Heidelberg. |
BibTeX:
@book{Giorgi_2004,
author = {Sneeuw, Nico and Novák, Pavel and Crespi, Mattia and Sansó, Fernando},
editor = {Sansò, Fernando},
title = {VII Hotine-Marussi Symposium on Mathematical Geodesy: Proceedings of the Symposium in Rome, 6-10 June, 2009},
booktitle = {International Association of Geodesy Symposia},
publisher = {Springer Berlin Heidelberg},
year = {2012},
volume = {137},
pages = {39--45},
url = {http://link.springer.com/10.1007/978-3-642-22078-4},
doi = {10.1007/978-3-642-22078-4}
}
|
| Thomas EG, Baker JBH, Ruohoniemi JM, Coster AJ and Zhang SR (2016), "The geomagnetic storm time response of GPS total electron content in the North American sector", Journal of Geophysical Research A: Space Physics., feb, 2016. Vol. 121(2), pp. 1744-1759. |
| Abstract: ... Early studies of storm time TEC response were obtained by measuring the Faraday rotation of transionospheric radio signals reflected from the moon RESEARCH ARTICLE 10.1002 / 2015JA022182 ... Journal of Geophysical Research: Space Physics 10.1002 / 2015JA022182 ... $n |
BibTeX:
@article{2016JGRA..121.1744T,
author = {Thomas, E. G. and Baker, J. B H and Ruohoniemi, J. M. and Coster, A. J. and Zhang, S. R.},
title = {The geomagnetic storm time response of GPS total electron content in the North American sector},
journal = {Journal of Geophysical Research A: Space Physics},
year = {2016},
volume = {121},
number = {2},
pages = {1744--1759},
doi = {10.1002/2015JA022182}
}
|
| Tornatore V, Kayıkçı ET and Roggero M (2016), "Comparison of ITRF2014 station coordinate input time series of DORIS, VLBI and GNSS", Advances in Space Research. Vol. 58(12), pp. 2742-2757. |
| Abstract: Abstract In this paper station coordinate time series from three space geodesy techniques that have contributed to the realization of the International Terrestrial Reference Frame 2014 (ITRF2014) are compared. In particular the height component time series extracted from official combined intra-technique solutions submitted for ITRF2014 by DORIS, VLBI and GNSS Combination Centers have been investigated. The main goal of this study is to assess the level of agreement among these three space geodetic techniques. A novel analytic method, modeling time series as discrete-time Markov processes, is presented and applied to the compared time series. The analysis method has proven to be particularly suited to obtain quasi-cyclostationary residuals which are an important property to carry out a reliable harmonic analysis. We looked for common signatures among the three techniques. Frequencies and amplitudes of the detected signals have been reported along with their percentage of incidence. Our comparison shows that two of the estimated signals, having one-year and 14 days periods, are common to all the techniques. Different hypotheses on the nature of the signal having a period of 14 days are presented. As a final check we have compared the estimated velocities and their standard deviations (STD) for the sites that co-located the VLBI, GNSS and DORIS stations, obtaining a good agreement among the three techniques both in the horizontal (1.0 mm/yr mean STD) and in the vertical (0.7 mm/yr mean STD) component, although some sites show larger STDs, mainly due to lack of data, different data spans or noisy observations. |
BibTeX:
@article{Tornatore20162742,
author = {Tornatore, Vincenza and Kayıkçı, Emine Tanır and Roggero, Marco},
title = {Comparison of ITRF2014 station coordinate input time series of DORIS, VLBI and GNSS},
journal = {Advances in Space Research},
year = {2016},
volume = {58},
number = {12},
pages = {2742--2757},
url = {//www.sciencedirect.com/science/article/pii/S0273117716303751},
doi = {10.1016/j.asr.2016.07.016}
}
|
| Tu R, Zhang H, Ge M and Huang G (2013), "A real-time ionospheric model based on GNSS Precise Point Positioning", Advances in Space Research., sep, 2013. Vol. 52(6), pp. 1125-1134. Elsevier BV. |
| Abstract: This paper proposes a method of real-time monitoring and modeling the ionospheric Total Electron Content (TEC) by Precise Point Positioning (PPP). Firstly, the ionospheric TEC and receiver's Differential Code Biases (DCB) are estimated with the undifferenced raw observation in real-time, then the ionospheric TEC model is established based on the Single Layer Model (SLM) assumption and the recovered ionospheric TEC. In this study, phase observations with high precision are directly used instead of phase smoothed code observations. In addition, the DCB estimation is separated from the establishment of the ionospheric model which will limit the impacts of the SLM assumption impacts. The ionospheric model is established at every epoch for real time application. The method is validated with three different GNSS networks on a local, regional, and global basis. The results show that the method is feasible and effective, the real-time ionosphere and DCB results are very consistent with the IGS final products, with a bias of 1-2 TECU and 0.4 ns respectively. ?? 2013 COSPAR. The Authors. Published by Elsevier Ltd. All rights reserved. |
BibTeX:
@article{Tu_2013,
author = {Tu, Rui and Zhang, Hongping and Ge, Maorong and Huang, Guanwen},
title = {A real-time ionospheric model based on GNSS Precise Point Positioning},
journal = {Advances in Space Research},
publisher = {Elsevier BV},
year = {2013},
volume = {52},
number = {6},
pages = {1125--1134},
url = {http://dx.doi.org/10.1016/j.asr.2013.06.015},
doi = {10.1016/j.asr.2013.06.015}
}
|
| Van Vliet-Lanoë B, Penaud A, Hénaff A, Delacourt C, Fernane A, Goslin Jé, Hallégouët B and Le Cornec E (2014), "Middle- to late-Holocene storminess in Brittany (NW France): Part II – The chronology of events and climate forcing", The Holocene ., feb, 2014. Vol. 24 (4 ), pp. 434-453. SAGE Publications. |
| Abstract: This study focuses on the recurring climate conditions required for the largest storms occurring in NW France (Brittany). It is based on the analysed records of storm events along Western Brittany coast (see Part I). In this manuscript (Part II), storm recurrence is explored along with forcing mechanisms. Periods of more frequent storm events over the two last centuries are analysed first in order to link these events with possible forcing mechanisms (North Atlantic Oscillation (NAO) and Atlantic Multidecadal Oscillation (AMO) modes) triggering the most destructive storms. Then, palaeostorm events are discussed at the Holocene scale, from 6000 yr BP to present, to verify the forcing mechanisms. Most recorded events appear to be linked with cooling episodes, mostly in winter, a transition to or from a negative winter NAO mode, a positive AMO mode. Extreme storms occur immediately prior to the ‘Medieval Warm Period’ (MWP). Maximum effects are reached prior to the onset of the MWP and during the Maunder and Dalton solar minima. Low storm activity occurred during the Spörer Minimum linked to an acceleration of the Atlantic Meridional Overturning Circulation (AMOC). Main storm triggers seem to correspond to a positive AMO mode with an unstable jetstream configuration driving a negative NAO. In this study, four specific weather configurations were defined to explain each type of recorded storminess. The strongest storms correspond to low AMO and decennial-negative NAO modes (e.g. ‘Little Ice Age’), or high AMO in association with dominant low NAO modes, as during the early Middle Age and present-day period. Fresh or warm oceans in association with a positive NAO mode are stormy but with very low sting storms frequency. Although in agreement with the orbital forcing and the Holocene glacial history, increasing storm frequency and intensity is most probably partly biased by continuous sea-level rise and resulting erosion. |
BibTeX:
@article{Van_Vliet_Lanoe_2014,
author = {Van Vliet-Lanoë, Brigitte and Penaud, Aurélie and Hénaff, Alain and Delacourt, Christophe and Fernane, Assia and Goslin, Jérôme and Hallégouët, Bernard and Le Cornec, Erwan},
title = {Middle- to late-Holocene storminess in Brittany (NW France): Part II – The chronology of events and climate forcing},
journal = {The Holocene },
publisher = {SAGE Publications},
year = {2014},
volume = {24 },
number = {4 },
pages = {434--453},
url = {http://hol.sagepub.com/content/24/4/434.abstract},
doi = {10.1177/0959683613519688}
}
|
| Vey S, Dietrich R, Fritsche M, Rülke A, Steigenberger P and Rothacher M (2009), "On the homogeneity and interpretation of precipitable water time series derived from global GPS observations", Journal of Geophysical Research Atmospheres. Vol. 114(10) Wiley-Blackwell. |
| Abstract: Observations of the Global Positioning System (GPS) were reanalyzed$nover the period from 1994 to 2004 in a joint project of the technical$nuniversities in Dresden and Munich. The estimated tropospheric parameters$nwere converted into precipitable water (PW) using surface pressure$nobservations from the World Meteorological Organization and atmospheric$nmean temperature fields from the European Centre for Medium-Range$nWeather Forecasts. For the first time a systematic study of the homogeneity$nof global GPS-derived precipitable water time series was carried$nout regarding the influence of changes in the GPS antennas and radomes$nas well as changes in the number of recorded observations. The focus$nof this study is on interannual changes in precipitable water. Over$nEurope, large parts of North America, and Iceland and in the region$nsouth of 30°S, these changes are very small. The range of the PW$nvariations on interannual time scales is less than 2 mm in these$nareas. However, in the southeastern part of North America and north$nAustralia, these anomalies in precipitable water show a range of$nup to 6 mm. In the tropics, PW anomalies with a range of up to 10$nmm were found. GPS PW was compared with a modeled PW assuming water$nvapor saturation. This shows that GPS PW of stations located in the$nmiddle and high northern and southern latitudes is consistent with$nthe temperature-related saturation values of water vapor. In the$ntropics and subtropics the annual temperature variations are low.$nIn these regions the variations in the PW can be dominated by other$nfactors, including water vapor transport. At seasonal time scales$nthe water vapor transport can be associated with atmospheric circulation$nsuch as monsoonal flow. |
BibTeX:
@article{Vey_2009,
author = {Vey, S. and Dietrich, R. and Fritsche, M. and Rülke, A. and Steigenberger, Peter and Rothacher, Markus},
title = {On the homogeneity and interpretation of precipitable water time series derived from global GPS observations},
journal = {Journal of Geophysical Research Atmospheres},
publisher = {Wiley-Blackwell},
year = {2009},
volume = {114},
number = {10},
url = {http://dx.doi.org/10.1029/2008jd010415},
doi = {10.1029/2008JD010415}
}
|
| Viti M, Mantovani E, Babbucci D and Tamburelli C (2011), "Plate kinematics and geodynamics in the Central Mediterranean", Journal of Geodynamics., mar, 2011. Vol. 51(2-3), pp. 190-204. Elsevier BV. |
| Abstract: We argue that seismotectonic activity in the Central Mediterranean area and the Aegean-Balkan zone is driven by the NNE-ward motion of Africa and westward motion of Anatolia with respect to Eurasia. These boundary conditions can plausibly and coherently account for E-W shortening and roughly S-N extension in the Aegean domain, thrusting and uplift at the boundary between the Aegean-Balkan system and the Adriatic/Ionian domain (Hellenic trench, Cephalonia fault, Epirus, Albanides and Southern Dinarides), the kinematics of the Adria plate (a large block encompassing the Adriatic continental domain, the northern Ionian zone and Hyblean-Adventure block) and consequently, the complex pattern of deformation recognized at its boundaries. Furthermore, the fact that in our scheme Adria moves almost in connection with Africa is consistent with the lack of an active decoupling zone between Adria and Africa, an evidence that can hardly be reconciled with the kinematics so far proposed for these two plates. The reasons why we adopt an Africa-Eurasia relative motion different from that implied by the popular NUVEL-1 global solution are discussed in detail. Finally, we make some considerations about the possible implications of the presently available geodetic data on the long-term plate kinematics. ?? 2010 Elsevier Ltd. |
BibTeX:
@article{Viti_2011,
author = {Viti, M. and Mantovani, E. and Babbucci, D. and Tamburelli, C.},
title = {Plate kinematics and geodynamics in the Central Mediterranean},
journal = {Journal of Geodynamics},
publisher = {Elsevier BV},
year = {2011},
volume = {51},
number = {2-3},
pages = {190--204},
url = {http://dx.doi.org/10.1016/j.jog.2010.02.006},
doi = {10.1016/j.jog.2010.02.006}
}
|
| Zhang SR, Erickson PJ, Foster JC, Holt JM, Coster AJ, Makela JJ, Noto J, Meriwether JW, Harding BJ, Riccobono J and Kerr RB (2015), "Thermospheric poleward wind surge at midlatitudes during great storm intervals", Geophysical Research Letters., jul, 2015. Vol. 42(13), pp. 5132-5140. |
| Abstract: ... DOI: 10.1002 / 2015GL064836 View/save citation; Cited by: 0 articles Check for new citationsCiting literature; Funding Information. Abstract. We report a significant poleward surge in thermospheric winds at subauroral and midlatitudes ... $n |
BibTeX:
@article{2015GeoRL..42.5132Z,
author = {Zhang, Shun Rong and Erickson, Philip J. and Foster, John C. and Holt, John M. and Coster, Anthea J. and Makela, Jonathan J. and Noto, John and Meriwether, John W. and Harding, Brian J. and Riccobono, Juanita and Kerr, Robert B.},
title = {Thermospheric poleward wind surge at midlatitudes during great storm intervals},
journal = {Geophysical Research Letters},
year = {2015},
volume = {42},
number = {13},
pages = {5132--5140},
doi = {10.1002/2015GL064836}
}
|
| Zhang S-R, Erickson PJ, Zhang Y, Wang W, Huang C, Coster AJ, Holt J, Foster JC, Sulzer MP and Kerr RB (2017), "Observations of ion-neutral coupling associated with strong electrodynamic disturbances during the 2015 St. Patrick's Day storm", Journal of Geophysical Research: Space Physics. |
BibTeX:
@article{Zhang2017,
author = {Zhang, Shun-Rong and Erickson, Philip J and Zhang, Yongliang and Wang, Wenbin and Huang, Chaosong and Coster, Anthea J. and Holt, John and Foster, John C and Sulzer, Michael P. and Kerr, Robert B.},
title = {Observations of ion-neutral coupling associated with strong electrodynamic disturbances during the 2015 St. Patrick's Day storm},
journal = {Journal of Geophysical Research: Space Physics},
year = {2017},
url = {http://doi.wiley.com/10.1002/2016JA023307},
doi = {10.1002/2016JA023307}
}
|