江苏省地震局,江苏 南京 210014
杜航(1991—),男,工程师,硕士。主要从事地震监测研究。E-mail:duh@mail.ustc.edu.cn
收稿:2022-02-21,
修回:2022-06-28,
纸质出版:2022-08-28
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杜航,郑江蓉,江昊琳等.利用FOCMEC和CAP方法反演2021年大丰海域M5.0及天宁M4.2地震震源机制解[J].防灾减灾工程学报,2022,42(04):874-880.
DU Hang,ZHENG Jiangrong,JIANG Haolin,et al.Inversion for the Focal Mechanisms of the 2021 Dafeng Sea M5.0 Earthquake and Tianning M4.2 Earthquake Using FOCMEC and CAP Methods[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(04):874-880.
杜航,郑江蓉,江昊琳等.利用FOCMEC和CAP方法反演2021年大丰海域M5.0及天宁M4.2地震震源机制解[J].防灾减灾工程学报,2022,42(04):874-880. DOI: 10.13409/j.cnki.jdpme.20220221001.
DU Hang,ZHENG Jiangrong,JIANG Haolin,et al.Inversion for the Focal Mechanisms of the 2021 Dafeng Sea M5.0 Earthquake and Tianning M4.2 Earthquake Using FOCMEC and CAP Methods[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(04):874-880. DOI: 10.13409/j.cnki.jdpme.20220221001.
利用FOCMEC和CAP方法分别对大丰海域
M
5.0地震、天宁
M
4.2地震震源机制解进行反演,分析两种方法所得结果的差异。大丰海域
M
5.0地震FOCMEC方法与CAP方法计算震源机制解结果存在细微差异,CAP方法所得结果与其它机构结果较为统一。天宁
M
4.2地震FOCMEC方法与CAP方法计算震源机制解结果基本一致。通过研究发现CAP方法对台站分布要求不高,但需要地震震级较大,波形信噪比高,震相拟合度较好;FOCMEC方法对地震震级要求不高,但需要震中位置被台站包围较好,且震中附近台站密度较高,P波初动清晰。
The FOCMEC and CAP methods were used to invert the focal mechanism solutions of the 2021 Dafeng Sea
M
5.0 earthquake and Tianning
M
4.2 earthquake, respectively. The discrepancy between the outcomes by the two methods was analyzed. It was thus found that there is a subtle discrepancy between the outcomes of the focal mechanism of the
M
5.0 earthquake in Da Feng sea area by the FOCMEC method and the CAP method, in which the CAP method generates a more consistent outcome with other institutes. The FOCMEC method and CAP method are basically consistent in calculating focal mechanism solutions of the Tianning
M
4.2 earthquake. By comparing the epicenter and station location of the two earthquakes, it can be seen that the CAP method does not have high requirements for station distribution, but needs a large earthquake magnitude, a high signal-to-noise ratio of waveform, and a good seismic phase fitting degree. Although the FOCMEC method does not have high requirements for earthquake magnitude, it needs an epicenter well surrounded by stations, a high density of stations near the epicenter, and a clear first P motion.
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