综合地球物理方法在地震安全性评价中的应用和成果

Synthesis Geophysical Method in Earthquake Safety Evaluation

以唐曹铁路地震安全性评价项目探测断裂为例,采用浅层地震勘探、小折射和钻探等综合地球物理方法,查明宁河—昌黎断裂的展布情况,并结合钻孔资料判定断层的活动时代。研究结果表明,宁河—昌黎断裂呈NEE向展布,由南、中、北3段组成,南北两段以正断为主,中段为走滑性质,为早—中更新世断裂。补充和丰富了该地区的地球物理勘探资料,为该地区的地震安全性评价,国土资源规划等提供基础资料。

In the seismic safety evaluation of Tang-cao railway project,we use synthesis geophysical methods including shallow seismic exploration,refraction,drilling to find out the distribution and activity time of the Ninghe-changli fault conbining with drilling data.The results show that the Ninghe-changli fault is an early-middle Pleistocene fault which extends in dirction of NEE and cosists of 3segment：south segment,middle segment and north segment,the south segment and north segment are mainly normal type while the the middle is strike-slip type.The study supplements and enrichs the geophysical prospecting data of the region and provides basic data for the seismic safety evaluation,land planning,et al.