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使用中国数字地震台网记录的区域和远震宽频带波形,通过频率域和时间域多步反演,研究四川芦山M_S 7.0地震基于点源模型的震源机制解和有限断层模型。考虑到使用不同波形资料类型、盆地效应及简化的一维速度模型等给反演震源参数带来的影响,经测试比较,结果表明:使用区域波形和本区域简化一维速度模型,波形拟合误差最小。此次地震表现为高倾角纯逆冲型事件矩心在水平方向上位于震中偏南西向约4.5 km,最佳波形拟合矩心深度约17 km,矩震级M_W约6.6。推断此地震大多数能量主要在震源偏南西约4.5 km处释放。
Using the regional and teleseismic broadband waveforms recorded by China Digital Seismic Network, the focal mechanism solution and finite fault model based on point source model of Lushan M_S 7.0 earthquake in Sichuan Province are studied by multi-step inversion in frequency domain and time domain. Taking into account the different waveform data types, basin effects and simplified one-dimensional velocity model to the inversion source parameters, the results show that: the use of regional waveforms and the region to simplify the one-dimensional velocity model, waveform fitting The smallest error. The earthquake shows that the centroid of purely thrust event with high dip angle is about 4.5 km from the epicenter in the horizontal direction, and the depth of the best waveform fitting centroid is about 17 km and the moment magnitude M_W is about 6.6. It is inferred that most of the energy released by this earthquake is mainly located about 4.5 km southwest of the focal point.