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Seismogenic Tectonics and Dynamics of the 2011 Ms5.9 yingjiang earthquake in Yunnan, China

Acta Geologica Sinica(English Edition) 2014年第2期88卷 468-482页

作者： SUN Yao AN Meijian FENG Mei LONG Changxing YANG Zhenyu Institute of Geomechanics Chinese Academy of Geological Sciences

In the southern South-North Seismic Zone,China,seismic activity in the yingjiang area of western Yunnan increased from December 2010,and eventually a destructive earthquake of Ms5.9 occurred near yingjiang town on 10 March *** focal mechanism and hypocenter location of the mainshock suggest that the Dayingjiang Fault was the site of the mainshock ***,most of foreshocks and all aftershocks recorded by a portable seismic array located close to the mainshock occurred along the N-S-striking Sudian Fault,indicating that this fault had an important influence on these *** stress calculations show that three strong （magnitude ≥5.0） earthquakes that occurred in the study region in 2008 increased the coulomb stress along the plane parallel to the Dayingjiang *** supports the Dayingjiang Fault,and not the Sudian Fault,as the seismogenic fault of the 2011 Ms5.9 yingjiang *** strong earthquakes in 2008 also increased the Coulomb stress at depths of ≤5 km along the entire Sudian Fault,and by doing so increased the shallow seismic activity along the *** explains why the foreshocks and aftershocks of the 2011 yingjiang earthquake were located mostly on the Sudian Fault where it cuts the shallow *** earthquakes at the intersection of the Sudian and Dayingjiang faults are distributed mainly along a belt that dips to the southeast at ～40°,suggesting that the Dayingjiang Fault in the mainshock area also dips to the southeast at ～40°.

关键词： yingjiang earthquake Dayingjiang fault Sudian fault earthquake triggering Yunnan

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

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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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