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Fast inversion of rupture process of the 14 April 2010 Yushu, Qinghai, earthquake |
Yong Zhang1, Lisheng Xu1, Yun-tai Chen1, 2 |
1 Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2 School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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Abstract Four results of the rupture process of 14 April 2010 Yushu, Qinghai, earthquake, obtained by inverting the broadband seismic data of Global Seismographic Network (GSN) based on the inversion method of earthquake rupture process, were compared and discussed. It is found that the Yushu earthquake has several basic characteristics as follows: ① There exist two principal sub-events which correspond to two slip-concentrated patches being located near the hypocenter and to the southeast of the epicenter. The rupture of the slip-concentrated patch to the southeast of the epicenter broke though the ground surface; ② The peak slip and peak slip-rate are about 2.1 m and 1.1 m/s, respectively, indicating that the Yushu earthquake is an event with large slip-rate on the fault plane; ③ Overall the Yushu earthquake is a unilateral rupture event with the rupture mainly propagating southeastward. The strong focusing of the seismic energy in the southeast of the epicenter due to the “seismic Doppler effect” reasonably accounts for the tremendous damage in the Yushu city.
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Received: 05 May 2010
Published: 10 June 2010
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Fund:China Postdoctoral Science Foundation funded project (20080440435) and the project (DQJB09B06) from Institute of Geophysics (IGP), China Earthquake Administration (CEA) |
Corresponding Authors:
Lisheng Xu
E-mail: xuls@cea-igp.ac.cn
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