涉县地震活动特征及其构造背景

Seismicity Characteristics and Tectonic Background of Strong Earthquake of Shexian

本文采用地质地貌调查、地震活动性分析和地质测年等方法,研究了涉县地区地震和构造的活动特征,并归纳总结涉县6.0级地震发生的构造条件,即:①震中位于大型地震带与地震亚带交汇区,现今地震活动性仍然较高;②震区附近发育1条规模较大、活动性较高的控制山盆界限断裂-涉县断裂;③震中位于孤立的涉县断陷盆地区边缘,山盆新构造运动差异。

In this paper,the characteristics of seismicity and tectonics of Shexian area are studied through geological and geomorphological survey,seismicity analysis and geochronology analysis,and the tectonic background for the occurrence of Shexian M.6.0 earthquake are summarized as follows:①The epicenter of the Mg6.0 earthquake is located in the intersection area of large-scale seismie belt and seismic sub belt,and the seismicity is still high at present;②The conjugate faults in NE and NW directions are developed near the earthquake area,and there is a large-scale and highly ac tive fault-Shexian fault,which controls the boundary of mountain basin;③The epicenter of the Mg6.0 earthquake is located on the edge of the isolated Shexian faulted basin area,and the basin mountain neotectonic movement is different in some aspects.