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《Acta Seismologica Sinica》 2010-03
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Fast inversion of rupture process for 14 April 2010 Yushu,Qinghai,earthquake

Zhang Yong1) Xu Lisheng1),Chen Yun-tai1,2)1) Institute of Geophysics,China Earthquake Administration,Beijing 100081,China2) School of Earth and Space Sciences,Peking University,Beijing 100871,China  
Four inversion 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,was 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 locating near the hypocenter and to the southeast of the epicenter. The rupture of the slip-concentrated patch to the southeast of the epicenter broken 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 of Yushu city.
【Fund】: 中国博士后科学基金项目(20080440435);; 中国地震局地震行业科研专项(200808068 200708031)共同资助
【CateGory Index】: P315.3
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