河南小浪底水库库区地震剪切波分裂研究

采用河南小浪底水库数字地震台网2009—2016年的地震观测资料,结合双差重定位结果,利用剪切波分裂系统分析方法,获得了小浪底水库库区8个数字地震台站的剪切波分裂参数.研究表明,小浪底库区地震主要分布在库区中段的石井河断层附近,呈团状散布;该区域的剪切波快波平均偏振方向为100.4°±45.0°,慢波平均时间延迟为(2...

Seismic Shear-wave Splitting of Henan Xiaolangdi Reservoir Region

Collecting the seismic data from 2009 to 2016 recorded by Henan Xiaolangdi Reservoir Digital Seismic Network,and combining with the results obtained by Double-Difference Hypocenter Locations,this study has obtained the S wave splitting parameters of 8 digital seismic stations distributed in the Xiaolangdi Reservoir region using the SAM method.The results show that the earthquakes occurred in the Xiaolangdi reservoir area are mainly distributed near the Shijing River fault,which is located in the middle of the reservoir area.The dominant polarization direction of the fast shear wave is 100.4°±45.0°and the average time delay of the slow shear wave is(2.87±1.13)ms/km.The dominant polarization direction is consistent with the direction of the regional principal compressive stress of the South China Block.The dominant polarization direction of the fast shear wave of most stations in the region is consistent with the fault strike of the region.The slow wave time delay is equivalent to the results obtained from the North China Block.