【摘要】 精确确定地震的震源机制解、震源深度和序列的相对位置是地震危险性分析的重要基础.2010年10月24日和2011年3月8日,河南太康地区分别发生MS4.6和MS4.1显著地震,为分析该弱震、少震区的地震危险性,本文利用CAP方法反演了震源机制解和震源深度,并结合深度震相波形记录进一步确认了深度的可靠性.结果显示,两次地震的震源机制解较为接近,均以走滑为主,深度也均为13km左右.此外,以主震作为参考事件,采用主事件法对余震的水平位置进行了相对定位,定位结果显示余震空间上分布的走向分别与主震震源机制解两个节面走向大致相同.本文结果为研究当地地震危险性提供了一定依据.更多还原

【Abstract】 Determinations of focal mechanism,focal depth and earthquake sequences relative locations play an important role on seismic hazard evaluation.On Oct 24,2010 and Mar 8,2011,a MS4.6 event and a MS4.1 event occurred in Taikang region.To evaluate the seismic hazard of this region,focal mechanisms and focal depths of these two events are inverted by CAP method.Depth phase sSmS are also used to confirm focal depths.The inversion results show that these two events have similar focal mechanisms,and focal depths are about 13 km.In addition,relative epicenter relocation is performed to relocate the aftershocks using the main shock as the reference event.The spatial orientations of relocated aftershocks show conjugate distribution,corresponding to the two fault planes of the main shock.The results provide fundamental information for seismic hazard study in this region.更多还原