3D GPS velocity field and its implications on the present-day postorogenic deformation of the Western Alps and Pyrenees
We present a new 3D GPS velocity solution for 182 sites for the region encompassing the Western Alps, Pyrenees, and southern France. The velocity field is based on a Precise Point Positioning (PPP) solution, to which we apply a common-mode filter, defined by the 26 longest time series, in order to c...
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ftubarcepubl:oai:diposit.ub.edu:2445/107807 2024-02-11T10:04:45+01:00 3D GPS velocity field and its implications on the present-day postorogenic deformation of the Western Alps and Pyrenees Nguyen, H. Vernant, P. Mazzotti, S. Khazaradze, Giorgi Asensio Ferreira, Eva 2016-09-21 15 p. application/pdf http://hdl.handle.net/2445/107807 eng eng European Geosciences Union (EGU) Reproducció del document publicat a: https://doi.org/10.5194/se-7-1349-2016 Solid Earth, 2016, vol. 7, p. 1349-1363 Articles publicats en revistes (Dinàmica de la Terra i l'Oceà) https://doi.org/10.5194/se-7-1349-2016 1869-9510 http://hdl.handle.net/2445/107807 663768 cc-by (c) Nguyen, H. et al., 2016 http://creativecommons.org/licenses/by/3.0/es info:eu-repo/semantics/openAccess Geofísica Sistema de posicionament global Escorça terrestre Pirineus Alps Geophysics Global Positioning System Earth's crust Pyrenees info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftubarcepubl https://doi.org/10.5194/se-7-1349-2016 2024-01-24T01:01:06Z We present a new 3D GPS velocity solution for 182 sites for the region encompassing the Western Alps, Pyrenees, and southern France. The velocity field is based on a Precise Point Positioning (PPP) solution, to which we apply a common-mode filter, defined by the 26 longest time series, in order to correct for network-wide biases (reference frame, unmodeled large scale processes, ¿). We show that processing parameters, such as troposphere delay modeling, can lead to systematic velocity variations of 0.1 - 0.5 mm/yr affecting both accuracy and precision, especially for short (< 5 yr) time series. A velocity convergence analysis shows that minimum time-series lengths of ~3 years and ~5.5 years are required to reach a velocity stability of 0.5 mm/yr in the horizontal and vertical components, respectively. On average, horizontal residual velocities show a stability of ~0.2 mm/yr in the Western Alps, Pyrenees, and southern France. The only significant horizontal strain rate signal is in the western Pyrenees with up to 4 x 10-9 yr-1 NNE-SSW extension, whereas no significant strain rates are detected in the Western Alps (< 1 x 10-9 yr-1). In contrast, we identify significant uplift rates up to 2 mm/yr in the Western Alps but not in the Pyrenees (0.1 ± 0.2 mm/yr). A correlation between site elevations and fast uplift rates in the northern part of the Western Alps, in the region of the Wurmian ice cap, suggests that part of this uplift is induced by postglacial rebound. The very slow uplift rates in the southern Western Alps and in the Pyrenees could be accounted for by erosion-induced rebound. Article in Journal/Newspaper Ice cap Dipòsit Digital de la Universitat de Barcelona Solid Earth 7 5 1349 1363 |
institution |
Open Polar |
collection |
Dipòsit Digital de la Universitat de Barcelona |
op_collection_id |
ftubarcepubl |
language |
English |
topic |
Geofísica Sistema de posicionament global Escorça terrestre Pirineus Alps Geophysics Global Positioning System Earth's crust Pyrenees |
spellingShingle |
Geofísica Sistema de posicionament global Escorça terrestre Pirineus Alps Geophysics Global Positioning System Earth's crust Pyrenees Nguyen, H. Vernant, P. Mazzotti, S. Khazaradze, Giorgi Asensio Ferreira, Eva 3D GPS velocity field and its implications on the present-day postorogenic deformation of the Western Alps and Pyrenees |
topic_facet |
Geofísica Sistema de posicionament global Escorça terrestre Pirineus Alps Geophysics Global Positioning System Earth's crust Pyrenees |
description |
We present a new 3D GPS velocity solution for 182 sites for the region encompassing the Western Alps, Pyrenees, and southern France. The velocity field is based on a Precise Point Positioning (PPP) solution, to which we apply a common-mode filter, defined by the 26 longest time series, in order to correct for network-wide biases (reference frame, unmodeled large scale processes, ¿). We show that processing parameters, such as troposphere delay modeling, can lead to systematic velocity variations of 0.1 - 0.5 mm/yr affecting both accuracy and precision, especially for short (< 5 yr) time series. A velocity convergence analysis shows that minimum time-series lengths of ~3 years and ~5.5 years are required to reach a velocity stability of 0.5 mm/yr in the horizontal and vertical components, respectively. On average, horizontal residual velocities show a stability of ~0.2 mm/yr in the Western Alps, Pyrenees, and southern France. The only significant horizontal strain rate signal is in the western Pyrenees with up to 4 x 10-9 yr-1 NNE-SSW extension, whereas no significant strain rates are detected in the Western Alps (< 1 x 10-9 yr-1). In contrast, we identify significant uplift rates up to 2 mm/yr in the Western Alps but not in the Pyrenees (0.1 ± 0.2 mm/yr). A correlation between site elevations and fast uplift rates in the northern part of the Western Alps, in the region of the Wurmian ice cap, suggests that part of this uplift is induced by postglacial rebound. The very slow uplift rates in the southern Western Alps and in the Pyrenees could be accounted for by erosion-induced rebound. |
format |
Article in Journal/Newspaper |
author |
Nguyen, H. Vernant, P. Mazzotti, S. Khazaradze, Giorgi Asensio Ferreira, Eva |
author_facet |
Nguyen, H. Vernant, P. Mazzotti, S. Khazaradze, Giorgi Asensio Ferreira, Eva |
author_sort |
Nguyen, H. |
title |
3D GPS velocity field and its implications on the present-day postorogenic deformation of the Western Alps and Pyrenees |
title_short |
3D GPS velocity field and its implications on the present-day postorogenic deformation of the Western Alps and Pyrenees |
title_full |
3D GPS velocity field and its implications on the present-day postorogenic deformation of the Western Alps and Pyrenees |
title_fullStr |
3D GPS velocity field and its implications on the present-day postorogenic deformation of the Western Alps and Pyrenees |
title_full_unstemmed |
3D GPS velocity field and its implications on the present-day postorogenic deformation of the Western Alps and Pyrenees |
title_sort |
3d gps velocity field and its implications on the present-day postorogenic deformation of the western alps and pyrenees |
publisher |
European Geosciences Union (EGU) |
publishDate |
2016 |
url |
http://hdl.handle.net/2445/107807 |
genre |
Ice cap |
genre_facet |
Ice cap |
op_relation |
Reproducció del document publicat a: https://doi.org/10.5194/se-7-1349-2016 Solid Earth, 2016, vol. 7, p. 1349-1363 Articles publicats en revistes (Dinàmica de la Terra i l'Oceà) https://doi.org/10.5194/se-7-1349-2016 1869-9510 http://hdl.handle.net/2445/107807 663768 |
op_rights |
cc-by (c) Nguyen, H. et al., 2016 http://creativecommons.org/licenses/by/3.0/es info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/se-7-1349-2016 |
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Solid Earth |
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