sPL震相在巴东M4.3地震序列震源深度测定中的应用

摘要

Based on the characteristics of depth phase sPL,aftershock data of the Badong M4.3 earthquake sequence on June 16th,2017 are selected to constrain its focal depth.Comparing the synthetic seismograms at different depths obtained by the F-K method with the actual waveform,the focal depth distributions are acquired.The results show that the earthquake sequence is dominantly in the depth range of ca.3-4 km and the error is about 1 km,indicating that reliable focal depth can be achieved by depth phase sPL in the Three Gorges reservoir area.%根据近震深度震相sPL的基本特征,对2017-06-16巴东M4.3地震序列震源深度进行分析,运用频率-波数(F-K)方法模拟不同深度下的理论地震图,并与实际波形拟合对比,得出震源深度分布.结果显示,该地震序列的震源深度集中在3～4 km范围内,误差约为1 km,表明在三峡地区利用sPL震相可以获得较为可靠的震源深度.