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《Chinese Journal of Geophysics》 2014-02
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Focal depth determination of aftershocks of Lushan M_S7.0 earthquake from sPn phase

SUN Zhuo;WU Jian-Ping;FANG Li-Hua;WANG Wei-Lai;WANG Chang-Zai;YANG Ting;Key Laboratory of Earthquake Geodesy,Institute of Seismology,China Earthquake Administration;Institute of Geophysics,China Earthquake Administration;  
Using the seismic waveforms recorded by the seismic array deployed in the southern section of the North-South seismic belt,the focal depths of 28 ML≥4.0aftershocks of the Lushan MS7.0earthquake are determined from the arrival-time differences between sPn and Pn phase.The Pn phase waves are picked by the waveform cross-correlation method,and the sPn phases are identified by using the sliding-window correlation method.The result shows that the focal depths are 10~20km.From the NW—SE profiles perpendicular to the seismic belt,the focal depths became shallower from west to east with a dip about 39°.The aftershocks show a linear characteristic in space,implying that they may be located in or near the faults relative to the main shock,and the fault dip of the main shock may be 39°.According to the spatial distribution of aftershocks,we infer that the seismogenic fault of Lushan earthquake may be the blind thrust fault to the east of the seismic zone rather than the Shuangshi-Dachuan fault.
【Fund】: 国家自然科学基金(41074068);; 地震行业科研专项(201308013 201408014);; 四川省芦山“4·20”7.0级强烈地震科学考察项目资助
【CateGory Index】: P315
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