涉县地震活动特征及其构造背景

Seismicity Characteristics and Tectonic Background of Strong Earthquake of Shexian

摘要:

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。

Abstract:

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_S6.0 earthquake are summarized as follows:①The epicenter of the M_S6.0 earthquake is located in the intersection area of large-scale seismic 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 active fault-Shexian fault,which controls the boundary of mountain basin;③The epicenter of the M_S6.0 earthquake is located on the edge of the isolated Shexian faulted basin area,and the basin mountain neotectonic movement is different in some aspects.