Abstract:Based on waveform data recorded by 19 broadband digital stations of Gansu, Qinghai and Ningxia regional seismic network, we use the CAP method to calculate the focal mechanism solution and the optimal focal depth of Menyuan MS6.4 earthquake in January 21, 2016. The results show that the double-couple solution is: nodalⅠ: strike 143°, dip angle 40°, slip angle 71°; nodalⅡ: strike 347.2°, dip angle 52.6°, slip angle 105.3°. The moment magnitude is MW5.9 and the optimal depth is 7.7 km, which is consistent with the results of others (such as CENC, IGP-CEA and Harvard). Using the arrival time difference between sPn phase extracted by sliding window correlation method, we obtain the focal depth of 8.5 km, which is coincident with the result of CAP inversion, and we validate the feasibility of the method.
YIN Xinxin,ZHAO Linlin,YANG Liming et al. Research on Focal Mechanism and South Depth of Menyuan, Qinghai MS6.4 Earthquake[J]. jgg, 2018, 38(6): 624-628.