摘要
本文从分析张家口市及邻近地区结晶基底特征、主要构造活动性,新生代构造盆地、深部地球物理场特征以及地震活动性入手,在对地震危险区分析的基础上,做出张家口市区稳定性初步分析和评价。结果认为,市区处于断块内部次稳定地区,预计在未来百年内可能发生的最大地震不超过5.5级,震中烈度不超过Ⅶ度,邻区危险地震影响烈度Ⅶ度,故基本烈度定为Ⅶ度。因此,在进行抗震防灾规划时,必须考虑设防措施。
This article begins with the analysis of the characteristics of the crystallization basement, mobility of the major structares, the structural basin of cenozoic era, the characteristics of ths deep-seated geophysicial field and the activity of earthquakes, making a primary analysis and estimate on the stability of Zhangjiakoa city. According to the result, it is known that the area lies in the sub-stable area in the fault block. It is estimated that in the coming one hurdred years the biggest earthquake that may break out will not go beyond 5.5 grade, and the epicentral earthquake intensity will not exceed 7 degree, the dangerous earthquake intensity in the influenced area nearby will be 7 degree, hence, the average earthquake intensity will be 7 degree. In view of the above estimation, prevention measures must be carefully considered.
