基于sPn深度震相的沙雅M_(S)4.8地震震源深度研究

FOCAL DEPTH OF SHAYA M_(S)4.8 EARTHQUAKE BASED ON DEEP SEISMIC PHASE sPn

采用深度震相sPn对新疆沙雅县M_(S)4.8地震事件进行震源深度计算,所得震源深度为12.6 km。采用震源机制解CAP以及PTD与单纯型法相结合的方法,计算震源深度结果分别为11.3 km、14.6 km。将3种方法计算出的震源深度进行对比分析,所得结果具有较好的一致性,且与沙雅隆起造成的走滑变形层所在深度基本一致。该结论说明通过深度震相sPn计算震源深度结果较为可靠,是计算震源深度的一种快捷、准确的方法。震源深度的准确测定,利于发震构造的判别,对震源处发生破裂过程的认知有重要影响,对地震事件的分析与预报具有重要意义。

Calculated the focal depth of Xinjiang Shaya M_(S)4.8 earthquake by using deep seismic phase sPn,focal depth result is 12.6 km.Using focal mechanism solution cap and the combination of PTD and simplex method,the focal depth results are 11.3 km and 14.6 km.The focal depths calculated by the three methods are compared and analyzed.The results obtained by the three methods are in good agreement,and are basically consistent with the depth of the strike slip deformation layer caused by the Shaya uplift.This conclusion shows that calculating the focal depth by depth phase sPn is relatively reliable,and it is a fast and accurate method for calculating the focal depth.The accurate determination is conducive to seismogenic structure identification which has an important impact on the cognition of the rupture process at the focal point,and is of great significance to the analysis and prediction of seismic events.