选取内蒙古地震台网记录的2009~2015年蒙宁交界区103次M_L ≥ 2.5地震波形资料，采用震源深度测定的单纯型法、Hyposat法、双差法、PTD法重新测定震源深度，并将所获得结果进行对比分析。用CAP矩张量反演法重新测定了阿拉善左旗5.8级和4.2级地震的震源深度。最终获得用PTD法和双差法所得的震源深度结果与蒙宁交界区的构造特征比较吻合，单纯型法、Hyposat法效果不佳。同时得到蒙宁交界地震构造区的平均震源深度为13.32±8km。

We selected the 103 M_L ≥ 2.5 earthquake waveform data on the Meng-Ning border during 2009~2015 recorded by the Inner Mongolia Digital Seismic Networks and used the simplex method Hyposat method,double difference location method,and deterministic method(PTD)for the determination of focal depth,and compared the results. The CAP moment tensor inversion method is used to determine the focal depths of the Alashan Left Flag 5.8 and 4.2 earthquakes. Finally with the deterministic method(PTD)and the double difference location method of the Meng-Ning border area we find that the focal depth results fit better with the tectonic characteristics of the border area while those with the simplex method and the Hyposat method do not. The average depth of he Meng-Ning border seismic tectonic zone is 13.32±8km.

P315

中国地震局监测、预测、科研三结合课题（160501）资助