交城断裂交城县城段的位置及其与地裂缝的关系

交城断裂为太原盆地西界的主控边界断裂,为查明交城断裂在这一地区的确切位置和地裂缝与交城断裂的关系,采用地震地质调查和人工地震勘探对在此范围内交城断裂的具体位置和地层错断情况进行了详细研究。结果表明,交城断裂交城县城段并不是位于基岩隆起区与盆地倾斜平原的分界处,而是位于距该分界东南约200 m处。交城县城西北侧的地裂缝与地震勘探在这一带所探查到的交城断裂的位置相当吻合,由此可以推断地裂缝的产生与交城断裂有关,属构造地裂缝。指出,在进行活动断裂附近的城市规划或重大工程建设时应对“山根”的倒退现象予以高度重视。

Study on Location of the Segment of Urban Jiaocheng County of Jiaocheng Fault and the Relationship between It and The Terra Cracks

Jiaocheng fault is the main control boundary fault of the west boundary of Taiyuan basin.Accurate location and stratigraphic fault of Jiaocheng fault in the range are detailedly studied by seismogeological investigation and artificial seismic(prospecting,)in order to find out true location of Jiaocheng fault in the area and the relationship between terra crack and Jiaocheng fault.The result indicates that the segment of urban Jiaocheng county of Jiaocheng fault is not located at dividing line of bedrock dome area and inclining plain of basin,but located at 200 meters south east to the boundary.Terra cracks in the north west of urban Jiaocheng county quite tally with the location of Jiaocheng fault ascertained by seismic prospecting in the area.It is concluded that the generation of terra crack is related to Jiaocheng fault and the terra crack belongs to tectonic terra crack.It is pointed that the phenomenon of "mountain foot go back" should be highly paid attention as city planning and important engineering construction near active fault are to be carried through.