【摘要】 利用来源于湖北区域台网共6个台的宽频带数字地震记录,采用CAP法(Cut and Paste Method)反演了2008年11月22日湖北-秭归Ms4.1级地震和09月27日Ms3.2中小震的震源机制解。结果显示,2次地震的震源机制解有一些差别,但是均为逆冲兼走滑分量性质断层,主压应力P轴主要集中在NE向,与区域主压应力方向有一定一致性。分析认为秭归地震可能是仙女山断裂受库水渗透和载荷变化影响引发的水库构造地震。通过与P波初动地震震源机制结果对比发现,该地震的震源机制的反演结果有较好的一致性,结果较可信。更多还原

【Abstract】 On the basis of the records of 6 stations in Hubei regional seismic network,we obtained the focal mechanisms of the Ms 4.1 and Ms3.2 earthquakes in Zigui on Nov.22,2008 and Sep.27,2008, respectively with the Cut and Paste(CAP) method. The result shows that earthquakes have strike-slip and strike-slip fault mechanisms and the orientations of maximum compressional stresses are mainly in NE. It is certainly consistent with the orientation of the regional maximum compressional stresses .We deduce the earthquake is the reservoir induced earthquake by water permeation and dynamic changes load.The comparison shows that the focus mechanism of two events presented in this paper is consistent with that of small-moderate earthquakes determined by P-wave first-motion.更多还原