2014年11月22日康定M6.3地震震源机制研究

Research on Focal Mechanism of 2014 Kangding M6.3 Earthquake

选取了四川省地震台网记录的宽频带地震波形资料,采用全波形反演研究了2014年11月22日发生的康定M6.3级地震的震源机制。研究结果表明该地震是发生在鲜水河断裂带上的又一次走滑事件。其震源机制解为:震源深度15km,矩震级为5.86;节面I走向241°,倾角80°,滑动角-175°;节面II走向150°,倾角85°,滑动角-10°。反演的震源机制解与采用CAP方法得到的结果非常接近。

Based on the local broadband seismic waveform data recorded by Sichuan Seismic Network,we obtained the focal mechanism of Kangding M6.3 earthquake on Nov.22,2014 by full waveform inversion.The results show that the earthquake is a strike-slip event on the Xianshuihe Fault with focal depth of 15 km and Mw5.86.The focal mechanism solution of the earthquake is that the nodal plane I has a strike of 242°,a dip of 80°and rake of-175°,while nodal plane II has a strike of 150°,a dip of 80°and a rake of-10°.The focal mechanism solutions are very close to the result by CAP method.