2010年1月24日山西河津-万荣Ms4.8地震特征

分析2010年1月24日山西河津-万荣Ms4.8地震序列特征,利用P波初动及振幅比和波形反演CAP两种方法计算震源机制解,结合本次地震的地质构造和历史地震活动背景、震源机制、余震分布、极震区长轴方向等分析,结果表明,隐伏的西辛封断裂为发震构造的可能性较大.

Characteristics of Hejin-Wanrong Ms 4.8 earthquake on January 24,2010

On January 24th, 2010, an earthquake with magnitude of 4.8 occurred between Hejin and Wanrong areas. In this paper, the characteristics of this earthquake sequence are studied and the focal mechanism solution is calculated using two methods of P-wave first motion and amplitude ratio and waveform inversion CAP. In addition, the trace of earthquake sequence and the judgment of further earthquake trendy are carried out based on multi-methods and inde- xes including sequence parameters, earthquake type distribution of historical earthquakes, focal mechanism solution and apparent stress. The seismogenic structure of this earthquake is also analyzed combining the geology structure, seismic active background of historical earthquakes, focal mechanism solution, aftershock distribution, direction of long-axis of meizoseismal area and accurate locations. The results indicate that Xixinfeng concealed fault has much larger possibility to be the seismogenic structure.