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3-D GPS velocity field and its implications on the present-day post-orogenic deformation of the Western Alps and Pyrenees

Solid earth (Göttingen), 2016-09, Vol.7 (5), p.1349-1363 [Peer Reviewed Journal]

COPYRIGHT 2016 Copernicus GmbH ;Copyright Copernicus GmbH 2016 ;2016. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 1869-9529 ;ISSN: 1869-9510 ;EISSN: 1869-9529 ;DOI: 10.5194/se-7-1349-2016

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  • Title:
    3-D GPS velocity field and its implications on the present-day post-orogenic deformation of the Western Alps and Pyrenees
  • Author: Nguyen, Hai Ninh ; Vernant, Philippe ; Mazzotti, Stephane ; Khazaradze, Giorgi ; Asensio, Eva
  • Subjects: Convergence ; Deformation ; Delay ; Earth science ; Earth Sciences ; Elevation ; Geophysics ; Global Positioning System ; Global positioning systems ; GPS ; Ice caps ; Mathematical models ; Orogeny ; Plate tectonics ; Process parameters ; Receivers & amplifiers ; Sciences of the Universe ; Software ; Stability ; Standard deviation ; Strain rate ; Studies ; Time series ; Troposphere ; Uplift ; Velocity ; Velocity distribution
  • Is Part Of: Solid earth (Göttingen), 2016-09, Vol.7 (5), p.1349-1363
  • 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 0.1-0.5mmyr super(-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 0.5mmyr super(-1) in the horizontal and vertical components, respectively. On average, horizontal residual velocities show a stability of -0.2mmyr super(-1) in the Western Alps, Pyrenees, and southern France. The only significant horizontal strain rate signal is in the western Pyrenees with up to 4x10 super(-9)yr super(-1) NNE-SSW extension, whereas no significant strain rates are detected in the Western Alps (<1x10 super(-9)yr super(-1)). In contrast, we identify significant uplift rates up to 2mmyr super(-1) in the Western Alps but not in the Pyrenees (0.1+ or -0.2mmyr super(-1)). 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.
  • Publisher: Gottingen: Copernicus GmbH
  • Language: English
  • Identifier: ISSN: 1869-9529
    ISSN: 1869-9510
    EISSN: 1869-9529
    DOI: 10.5194/se-7-1349-2016
  • Source: DOAJ Directory of Open Access Journals
    Hyper Article en Ligne (HAL) (Open Access)
    ProQuest Central
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