【摘要】 利用四川区域数字地震台网记录,采用滑动时窗相关法识别sPn震相,测定了四川攀枝花2008年8月31日MS5.6地震的震源深度。研究结果显示,震源深度为17km,表明震源位于中上地壳。元谋—绿汁江断裂带上中强地震分布与断裂走向吻合,震源机制解以走滑为主,这些表明此断裂近乎直立。结合此次地震的震源深度,我们推测此断裂可能达到20km深。更多还原

【Abstract】 Sliding-window correlation is a useful technique for identifying sPn phase and to constrain earthquake focal depth for an event with MS5.6 occurred on August 31,2008 in Panzhihua of Sichuan province.The result shows that the focal depth is about 17 km,and the hypocenter is located in the upper-to-middle crust.Combining with focal mechanism dominated with strike-slip and distributions of the earthquakes along the Yuanmou-luzhijiang fault,we suggest that the fault is near vertical and may extend to a depth of 20 km.更多还原