Coseismic fault slip of the 2008 Mw7.9 Wenchuan earthquake estimated from InSAR and GPS measurements

Guangcai Feng, Eric A. Hetland, Xiaoli Ding, Zhiwei Li, Lei Zhang

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We infer co-seismic fault slip during the 2008 Mw7.9 Wenchuan earthquake from interferometric synthetic aperture radar (InSAR) and GPS observations of ground deformation. We use ALOS/PALSAR data from ascending orbits on six tracks, and we do not use data that are strongly affected by ionospheric perturbations. We use a fault model composed of three planar fault segments of the Beichuan fault, and one planar segment representing the parallel Pengguan fault. Maximum thrust-slip is up to 6.7 m near the surface, and occurs in two locations, near Yingxiu in the south and Beichuan in the center of the rupture. Maximum strike-slip is over 4 m, and occurs near Pingtong and Nanba along the northern end of the rupture. We find that the ratio of coseismic thrust-to strike-slip on the Beichuan fault decreases from 1.5 to 0.7 from the SW to the NE.
Original languageEnglish
Article numberL01302
JournalGeophysical Research Letters
Issue number1
Publication statusPublished - 1 Jan 2010

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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