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Relocation of the 10 March 2011 yingjiang,China,earthquake sequence and its tectonic implications

Earthquake Science 2012年第1期25卷 103-110页

作者： Jianshe Lei Guangwei Zhang Furen Xie Yuan Li Youjin Su Lifang Liu Honghu Ma Junwei Zhang Key Laboratory of Crustal Dynamics Institute of Crustal DynamicsChina Earthquake AdministrationBeijing 100085China Earthquake Administration of Yunnan Province Kunming 650224China

An earthquake with Ms5.8 occurred on 10 March 2011 in yingjiang county, western Yunnan, China. This earthquake caused 25 deaths and over 250 injuries. In order to better understand the seismotectonics in the region, we collected the arrival time data from the Yunnan seismic observational bulletins during 1 January to 25 March 2011, and precisely hand-picked the arrival times from high-quality seismograms that were recorded by the temporary seismic stations deployed by our Institute of Crustal Dynamics, China Earthquake Administration. Using these arrival times, we relocated all the earthquakes including the yingjiang mainshock and its aftershocks using the double-difference relocation algorithm. Our results show that the relocated earthquakes dominantly occurred along the ENE direction and formed an upside-down bow-shaped structure in depth. It is also observed that after the yingjiang mainshock, some aftershocks extended toward the SSE over about 10 km. These results may indicate that the yingjiang mainshock ruptured a conjugate fault system consisting of the ENE trending da yingjiang fault and a SSE trending blind fault. Such structural features could contribute to severely seismic hazards during the moderate-size yingjiang earthquake.

关键词： yingjiang earthquake relocation double-difference algorithm da yingjiang fault

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