摘要
通过地形地质、化探、浅层物探、钻探和槽探等多手段的联合剖面探测研究，首次查明了夏垫隐伏断裂和南口－孙河隐伏断裂的准确位置及其活动性，发现上述隐伏断裂同时具有缓慢同生断裂运动和间隙性突发位错两种运动型式。夏垫隐伏断裂在距今５０００年以来有过两次与７级以上地震相当的突发性断层位错；南口－孙河隐伏断裂在最近的１．２万年以来仅发生一次约相当７级地震的突发性断裂位错。这表明，北京平原区的各个隐伏断裂自晚第四纪以来，在活动强度和突发性位错（即大震重复发生）的时间间隔等方面存在有明显的差异。
In this paper, the location and activity of the Xiadian and Nankou-Sunhe subsurface faults first are ascertained by means of joint profile survey, including geological survey, chemical and shollow geophysical prospecting, drilling and geosynclinal exploration. It is found that there exist two movement patterns, slow syngenetic fault movement and abrupt dislocation at interval, in both of the subsurface faults. Two abrupt fault dislocations equivalent to earthquake of more than M 7 have occurred in the Xiadian subsurface fault 5,000 years ago while only one abrupt fault dislocation equivalent to earthquake with M 7 has occurred in the Nankou-Sunhe subsurface fault since recent 12,000 years, which indicates that there have been significant differences in active intensity and interval of abrupt dislocation among various subsurface faults in Beijing plain region since the late Quaternary.
出处
《地震研究》
CSCD
北大核心
1995年第1期75-79,共5页
Journal of Seismological Research
基金
国家自然科学基金
关键词
隐伏构造
联合剖面法
晚第四纪
地震地质
Subsurface structure, Quaternary geology, Combined profiling method.
