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本文根据野外调查资料以及地质部门提供的地层和重力资料,总结了震区区域地质基本特征,指出新生代中这里主要受北东东向的挤压应力作用,导致地壳大规模的收缩。 地震资料表明6.8级地震是在近南北向的压应力作用下发生的。这里的构造应力场与地震应力场不一致的问题是值得深入研究的。
Based on the field survey data and the data of geologic and geomechanical data provided by the geology department, this paper summarizes the basic geologic features of the regional earthquake area and points out that the Mesozoic-Cenozoic is mainly subjected to compressional stress from the northeast to east and leads to the crustal mass shrinkage. Seismic data show that the 6.8 magnitude earthquake occurred near the north-south compressive stress. The problem of inconsistency between the tectonic stress field and the seismic stress field here deserves further study.