Zheng, G, Wang, H, Wright, TJ orcid.org/0000-0001-8338-5935 et al. (6 more authors) (2017) Crustal Deformation in the India‐Eurasia Collision Zone From 25 Years of GPS Measurements. Journal of Geophysical Research: Solid Earth, 122 (11). pp. 9290-9312. ISSN 2169-9313
Abstract
The India‐Eurasia collision zone is the largest deforming region on the planet; direct measurements of present‐day deformation from Global Positioning System (GPS) have the potential to discriminate between competing models of continental tectonics. But the increasing spatial resolution and accuracy of observations have only led to increasingly complex realizations of competing models. Here we present the most complete, accurate, and up‐to‐date velocity field for India‐Eurasia available, comprising 2576 velocities measured during 1991–2015. The core of our velocity field is from the Crustal Movement Observation Network of China‐I/II: 27 continuous stations observed since 1999; 56 campaign stations observed annually during 1998–2007; 1000 campaign stations observed in 1999, 2001, 2004, and 2007; 260 continuous stations operating since late 2010; and 2000 campaign stations observed in 2009, 2011, 2013, and 2015. We process these data and combine the solutions in a consistent reference frame with stations from the Global Strain Rate Model compilation, then invert for continuous velocity and strain rate fields. We update geodetic slip rates for the major faults (some vary along strike), and find that those along the major Tibetan strike‐slip faults are in good agreement with recent geological estimates. The velocity field shows several large undeforming areas, strain focused around some major faults, areas of diffuse strain, and dilation of the high plateau. We suggest that a new generation of dynamic models incorporating strength variations and strain‐weakening mechanisms is required to explain the key observations. Seismic hazard in much of the region is elevated, not just near the major faults.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2017. American Geophysical Union. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | GPS geodesy; crustal deformation; velocity and strain rate fields; fault slip rates; block vs continuum models; India-Eurasia collision |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst of Geophysics and Tectonics (IGT) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 28 Sep 2017 14:13 |
Last Modified: | 21 Apr 2021 11:26 |
Status: | Published |
Publisher: | American Geophysical Union |
Identification Number: | 10.1002/2017JB014465 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:121821 |