3-D GPS velocity field and its implications on the present-day post-orogenic deformation of the Western Alps and Pyrenees
We present a new 3-D 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...
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ftdoajarticles:oai:doaj.org/article:56d7460365c742a6bef8e2399aa812ba 2023-05-15T16:38:20+02:00 3-D GPS velocity field and its implications on the present-day post-orogenic deformation of the Western Alps and Pyrenees H. N. Nguyen P. Vernant S. Mazzotti G. Khazaradze E. Asensio 2016-09-01T00:00:00Z https://doi.org/10.5194/se-7-1349-2016 https://doaj.org/article/56d7460365c742a6bef8e2399aa812ba EN eng Copernicus Publications http://www.solid-earth.net/7/1349/2016/se-7-1349-2016.pdf https://doaj.org/toc/1869-9510 https://doaj.org/toc/1869-9529 1869-9510 1869-9529 doi:10.5194/se-7-1349-2016 https://doaj.org/article/56d7460365c742a6bef8e2399aa812ba Solid Earth, Vol 7, Iss 5, Pp 1349-1363 (2016) Geology QE1-996.5 Stratigraphy QE640-699 article 2016 ftdoajarticles https://doi.org/10.5194/se-7-1349-2016 2022-12-31T00:52:46Z We present a new 3-D 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, etc.). We show that processing parameters, such as troposphere delay modeling, can lead to systematic velocity variations of 0.1–0.5 mm yr −1 affecting both accuracy and precision, especially for short (< 5 years) time series. A velocity convergence analysis shows that minimum time-series lengths of ∼ 3 and ∼ 5.5 years are required to reach a velocity stability of 0.5 mm yr −1 in the horizontal and vertical components, respectively. On average, horizontal residual velocities show a stability of ∼ 0.2 mm yr −1 in the Western Alps, Pyrenees, and southern France. The only significant horizontal strain rate signal is in the western Pyrenees with up to 4 × 10 −9 yr −1 NNE–SSW extension, whereas no significant strain rates are detected in the Western Alps (< 1 × 10 −9 yr −1 ). In contrast, we identify significant uplift rates up to 2 mm yr −1 in the Western Alps but not in the Pyrenees (0.1 ± 0.2 mm yr −1 ). A correlation between site elevations and fast uplift rates in the northern part of the Western Alps, in the region of the Würmian 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 Directory of Open Access Journals: DOAJ Articles Solid Earth 7 5 1349 1363 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 Stratigraphy QE640-699 |
spellingShingle |
Geology QE1-996.5 Stratigraphy QE640-699 H. N. Nguyen P. Vernant S. Mazzotti G. Khazaradze E. Asensio 3-D GPS velocity field and its implications on the present-day post-orogenic deformation of the Western Alps and Pyrenees |
topic_facet |
Geology QE1-996.5 Stratigraphy QE640-699 |
description |
We present a new 3-D 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, etc.). We show that processing parameters, such as troposphere delay modeling, can lead to systematic velocity variations of 0.1–0.5 mm yr −1 affecting both accuracy and precision, especially for short (< 5 years) time series. A velocity convergence analysis shows that minimum time-series lengths of ∼ 3 and ∼ 5.5 years are required to reach a velocity stability of 0.5 mm yr −1 in the horizontal and vertical components, respectively. On average, horizontal residual velocities show a stability of ∼ 0.2 mm yr −1 in the Western Alps, Pyrenees, and southern France. The only significant horizontal strain rate signal is in the western Pyrenees with up to 4 × 10 −9 yr −1 NNE–SSW extension, whereas no significant strain rates are detected in the Western Alps (< 1 × 10 −9 yr −1 ). In contrast, we identify significant uplift rates up to 2 mm yr −1 in the Western Alps but not in the Pyrenees (0.1 ± 0.2 mm yr −1 ). A correlation between site elevations and fast uplift rates in the northern part of the Western Alps, in the region of the Würmian 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 |
H. N. Nguyen P. Vernant S. Mazzotti G. Khazaradze E. Asensio |
author_facet |
H. N. Nguyen P. Vernant S. Mazzotti G. Khazaradze E. Asensio |
author_sort |
H. N. Nguyen |
title |
3-D GPS velocity field and its implications on the present-day post-orogenic deformation of the Western Alps and Pyrenees |
title_short |
3-D GPS velocity field and its implications on the present-day post-orogenic deformation of the Western Alps and Pyrenees |
title_full |
3-D GPS velocity field and its implications on the present-day post-orogenic deformation of the Western Alps and Pyrenees |
title_fullStr |
3-D GPS velocity field and its implications on the present-day post-orogenic deformation of the Western Alps and Pyrenees |
title_full_unstemmed |
3-D GPS velocity field and its implications on the present-day post-orogenic deformation of the Western Alps and Pyrenees |
title_sort |
3-d gps velocity field and its implications on the present-day post-orogenic deformation of the western alps and pyrenees |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/se-7-1349-2016 https://doaj.org/article/56d7460365c742a6bef8e2399aa812ba |
genre |
Ice cap |
genre_facet |
Ice cap |
op_source |
Solid Earth, Vol 7, Iss 5, Pp 1349-1363 (2016) |
op_relation |
http://www.solid-earth.net/7/1349/2016/se-7-1349-2016.pdf https://doaj.org/toc/1869-9510 https://doaj.org/toc/1869-9529 1869-9510 1869-9529 doi:10.5194/se-7-1349-2016 https://doaj.org/article/56d7460365c742a6bef8e2399aa812ba |
op_doi |
https://doi.org/10.5194/se-7-1349-2016 |
container_title |
Solid Earth |
container_volume |
7 |
container_issue |
5 |
container_start_page |
1349 |
op_container_end_page |
1363 |
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1766028617835347968 |