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《Seismology and Geology》 2016-04
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THE SHEAR-WAVE SPLITTING OF GAIZHOU EARTHQUAKE SWARM IN LIAONING

LI Jin;GAO Yuan;ZHANG Bo;WANG Liang;GAO Rong;Earthquake Administration of Xinjiang Uygur Autonomous Region;Institute of Earthquake Science,China Earthquake Adiministration;Earthquake Administration of Liaoning Province;  
An M_L4. 7 earthquake occurred on February 2, 2012 in Liaoning Gaizhou( 40. 56° N,122. 36°E),since then,small earthquakes are frequent in this area,and until now the seismic activity does not stop,several earthquakes with magnitude larger than 4. 0 have occurred. As of October 30,2014,1223 earthquakes have happened in the Gaizhou area,including 934 earthquakes with the magnitude M_L1. 0 ~ 1. 9,247 with the magnitude M_L2. 0 ~ 2. 9 and 45 with the magnitude M_L3. 0 ~ 3. 9. Meanwhile,earthquakes are continuously active in Haicheng area where the M_S7. 3earthquake happened in 1975,and there are over 1100 earthquakes( M_L≥1. 0) having occurred since the Gaizhou earthquake swarm activity. Because the polarization direction of the fast shear wave is very sensitive to the variation of the principal stress environment,the shear wave splitting parameter can reflect the regional stress state and the local structural features,especially effective for the analysis of small-scale stress environment characteristics. So based on the seismic activities of the two earthquake clusters, this study analyzes the characteristics of shear-wave splitting in GaizhouHaicheng area. Preliminary results show that predominant polarization direction of fast shear-waves in the old earthquake region of Haicheng is stable,consistent with the direction of regional stress field.Due to presence of active fault below the Gaixian station( GAX),the predominant polarization direction of fast shear-waves is more complicated. There are two predominant polarizations,consistent respectively with Jinzhou Fault strike which is below the station and the maximum principal stress direction in this area. In addition,Gaizhou earthquake swarm activity increased after December 22,2013,and after the time node,the predominant polarization direction of fast shear-waves in Gaixian station is SEE,which is close to the predominant polarization direction of fast shear-waves in Yingkou station,at the same time consistent with the maximum principal stress direction of this region. Thus it can be inferred,the enhanced activity of Gaizhou earthquake swarm since December 22,2014 may be related to local enhancement of regional stress. In addition,the average time-delays of slow waves in station YKO and GAX show that there are no obvious changes before and after the time point of December 22,2013,which is different greatly with the previous related researches on the variation of slow wave time-delays,and there is no possibility that the Gaizhou earthquake swarm evolved into foreshock sequences from current preliminary results. We should do more work to study the details of the time delay variation of shear wave splitting parameter.
【Fund】: 地震科技星火计划(XH17041Y);; 2015年度震情跟踪合同制定向工作任务(2015010113);; 新疆维吾尔自治区青年自然科学基金(2014211B39)共同资助
【CateGory Index】: P315
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