摘要
以构造稳定性研究为主,配合介质稳定性和地面稳定性的研究,采用模糊数学评判方法,对环渤海地区区域地壳稳定性进行了探讨。以现今构造应力场、现今地壳垂直形变和水平形变资料为依据,综合分析探讨现今构造活动性和地震活动的规律,将本区地壳稳定性划分出相对稳定、相对基本稳定、相对较不稳定、相对不稳定四个等级。相对稳定区主要有辽东本溪—凤城等地,相对基本稳定区主要有辽宁阜新—抚顺—本溪—岫岩环形带等地,相对较不稳定区主要有河北昌黎—玉田—霸州—任丘—海兴等地,相对不稳定区主要有唐山—天津—沧州等地。评价分区结果与中国地震局用地震危险性分析概率方法所编著的地震烈度区划图、地震动区划图结果是一致的。
Through the investigation of the structural stress field present period, the vertical and horizontal deformation of the crust, the stability of the earth's crust in Circum-Bohai-Sea Region is discussed in this paper based on the studies of the stability of the rock, soil medium and the ground surface, and present structural activity and seismic active regularity. It is suggested that four relative stable grades should be divided in this region, i.e. stable, sub-stable, less stable and instable. The stable areas include Benxi-Fengcheng of Eastern Liaoning etc., and the sub-stable areas Fuxin--Fushun-Benxi-Xiuyan etc., less stable areas Changli-Yutian-Bazhou-Renqiu--Haixing etc., and instable areas Tangshan-Tianjin-Cangzhou etc.. This division of the regional crustal stability is the same with the conclusion that worked by China Seismic Bureau on the basis of the probability method of earthquake fatalness analysis.
出处
《地质调查与研究》
2005年第1期47-55,共9页
Geological Survey and Research
基金
中国地质调查局地质调查项目(200112400003)
