The Effect of Static Stress Triggering of the M_S 7. 1 Yushu Earthquake  

作　　者：Song Jin Jiang Haikun 

机构地区：[1]China Earthquake Networks Center, Beijing 100045, China

出　　处：《Earthquake Research in China》2012年第3期348-354,共7页中国地震研究（英文版）

基　　金：sponsored by the National Key Technology R&D Program,China (2008BAC38B03-01)

摘　　要：This paper calculates the static stress changes generated by the Yushu M_S 7. 1 earthquake in Qinghai Province. On the basis of regional stress,we take account of the static stress change triggered by the Yushu M_S 7. 1 earthquake to find the optimally oriented fault planes,then calculate the Coulomb stress change on the optimally oriented fault plane. The results indicate that most of the aftershocks are triggered by the mainshock. The image of Coulomb stress changes is also in accord with regional earthquakes ( M_L ≥3. 0 ) distribution,but the value is lower than 0. 01MPa. In addition,this paper calculates the Coulomb stress changes in the case that the aftershock fault plane is the same as the main shock. Through comparison,we find that the image of Coulomb stress changes obtained using the "optimally oriented fault"approach is more consistent with the distribution of Yushu aftershocks and regional earthquakes.This paper calculates the static stress changes generated by the Yushu Ms7.1 earthquake in Qinghai Province. On the basis of regional stress, we take account of the static stress change triggered by the Yushu Ms 7. 1 earthquake to find the optimally oriented fault planes, then calculate the Coulomb stress change on the optimally oriented fault plane. The results indicate that most of the aftershocks are triggered by the mainshock. The image of Coulomb stress changes is also in accord with regional earthquakes （ML ~〉 3. 0） distribution, but the value is lower than 0.01MPa. In addition, this paper calculates the Coulomb stress changes in the case that the aftershock fault plane is the same as the main shock. Through comparison, we find that the image of Coulomb stress changes obtained using the ＂optimally oriented fault＂ approach is more consistent with the distribution of Yushu aftershocks and regional earthquakes.

关 键 词：Ms7. 1 Yushu earthquake Coulomb stress changes Aftershock distribution Regional stress 

分 类 号：P315.33[天文地球—地震学] P553[天文地球—固体地球物理学]