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Source parameters of the 2008 Gaize Mw 6.4 and Mw 5.9 earthquakes from InSAR measurements

Lookup NU author(s): Professor Zhenhong Li


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On 9 January 2008, an MW6.4 earthquake struck Gêrzê, Tibet of China, followed by 40 aftershocks with magnitudes equal to or greater than 3.5, including the biggest one with MW5.9 on 16 January 2008. Two tracks (1 ascending and 1 descending) of ENVISAT ASAR data were processed to precisely determine the locations and amplitudes of coseismic surface displacements firstly. Then the coseismic displacements were inverted to build uniform dislocation models and further distributed-slip models in an elastic half-space. The inverted results suggest that the MW6.4 main shock is associated with a west-dipping fault plane with a strike of 218° and a dip of 52°, while the MW5.9 aftershock is related with a west-dipping fault plane, 3.2 km west to the main fault, with a strike of 200° and a dip of 59°; and the peak slip of 1.9 m is located at a depth of 7.6 km in the main fault, whilst the maximum slip of 1.0 m is observed at a depth of 3.9 km in the aftershock fault plane.

Publication metadata

Author(s): Feng W, Xu L, Xu Z, Li Z, Li C, Zhao H

Publication type: Article

Publication status: Published

Journal: Chinese Journal of Geophysics (Chinese Edition)

Year: 2009

Volume: 52

Issue: 4

Pages: 983-993

Print publication date: 15/04/2009

ISSN (print): 0001-5733

Publisher: Zhongguo Kexueyuan Dizhi yu Diqiu Wuli Yanjiusuo