北京地区区域应力场及地壳稳定性研究

作者根据北京地区的地震、地质构造、挽近地壳活动等特征,建立了数学模拟模型,并从研究现代地震活动的构造力学条件入手,计算了北京地区现今构造应力场及区内断裂活动性增加时现今构造应力场的调整值,在此基础上建立综合调整影响场。最后根据综合调整影响场分析和比较了北京地区区域地壳的相对稳定程度和北京市地壳的相对稳定程度,指出南口—孙河断裂活动性增加对北京市的地壳稳定性具有较大的影响。

THE RESEARCH ON THE RECENT STRESS FIELD AND REGIONAL STABILITY IN THE BEIJING AREA

The stress is an important factor in the research on the crustal stability of a given region. Its occurring and developing is closely related to the earthquake and fault action. So it's an important method to evaluate the crustal stability of a given region from the stress. Mathematical stimulating model has been established according to the seismic and geological structure and recent crustal acting and so on in Beijing area (Fig. 1). On the above-mentioned method the authors calcaulated the field of recent structural stress and the fields of regulating influence as the increasing of fractural action in Beijing area(Fig. 4-Fig. 10), and established the field of comprehensive reguting influence as the increasing of fractural action on the basis of every field of regulating influence (Fig. 11). The authors also analysis and compare the relative grade of crustal stability of Beijing area and the relative grade of crustal stability of Beijing city in Beijing area, and get a conclusion that the increasing of Nankao-Sunhe fault action is rather affecting to the crustal stability of Beijing city.