Kinematic fault slip evolution source models of the 2008 M7.9 wenchuan earthquake in china from SAR interferometry, GPS and teleseismic analysis and implications for longmen shan tectonics

Fielding, E.J. and Sladen, A. and Li, Z. and Avouac, J.-P. and Bürgmann, R. and Ryder, I.d (2013) Kinematic fault slip evolution source models of the 2008 M7.9 wenchuan earthquake in china from SAR interferometry, GPS and teleseismic analysis and implications for longmen shan tectonics. Geophysical journal international, 194 (2). pp. 1138-1166. ISSN Online ISSN 1365-246X Print ISSN 0956-540X DOI 10.1093/gji/ggt155

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Official URL: http://gji.oxfordjournals.org/content/194/2/1138

Abstract

The Mw 7.9 2008Wenchuan earthquake ruptured about 280 km of faults in the Longmen Shan of Sichuan province, China, at the eastern edge of the Tibetan Plateau. We use teleseismic waveforms with geodetic data from Global Positioning System, synthetic aperture radar interferometry and image amplitude correlation to produce a source model of this earthquake. The model describes evolution of fault slip du lique slip (right-lateral and thrust) and the proportion of lateral motion increasing in the northern Longmen Shan. The northernmost fault segment has a much steeper dip, consistent with nearly pure strike-slip motion. The kinematic source model shows that the rupture propagated to the northeast at about 2.5-3.0 kms-1, producing a cascade of subevents with a total duration of about 110 s. The complex fault ruptures caused shortening and uplift of the extremely steep central Longmen Shan, which supports models where the steep edge of the plateau is formed by thrusting over the strong crust of the Sichuan Basin. © The Authors 2013.

Item Type: Article
Uncontrolled Keywords: NILAREP;
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
08 - Green Open Access
Journal or Publication Title: Geophysical journal international
Volume: 194
Page Range: pp. 1138-1166
Identification Number: 10.1093/gji/ggt155
Depositing User: Sarah Humbert
Date Deposited: 22 Jan 2015 18:17
Last Modified: 23 Jan 2015 13:25
URI: http://eprints.esc.cam.ac.uk/id/eprint/3205

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