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京西盆岭构造区积累库仑破裂应力变化对强震的影响
陈丹,郝平
作者单位
陈丹 中国地震局地震预测重点实验室, 北京 100036 
郝平 中国地震局地震预测重点实验室, 北京 100036 
摘要:
以拉张正断层作用为主的京西盆岭活动构造区(112°~116°N,38.3°~41.5°E)自BC 231年以来共记载和记录15次M6.0~7.5地震。本研究计算每一次强震产生的以及逐次积累的库仑破裂静应力变化,并分析强震之间的应力触发关系。结果显示在14次后发的强震中,有10次发生在先发强震产生的积累库仑破裂静应力变化为正的触发区,触发率为71%。所有15次历史强震作用共同引起研究区积累库仑破裂静应力变化的正值区,主要分布于六棱山北麓断裂中段、怀涿盆地北缘断裂、新保安沙城断裂、桑干河断裂以及蔚县盆地南缘断裂,并使得这些断裂(段)的强震危险性有所增加,这可为分析研究区的未来强震危险性提供参考。
关键词:  库仑破裂应力积累变化  地震危险性  京西盆岭构造区
DOI:
分类号:
基金项目:
Cumulative Coulomb Failure Stress Change in the Basin-range Region of West Beijing and Its Effect on Strong Earthquakes
Chen Dan,Hao Ping
Abstract:
Since 231 B.C., a total of 15 M6.0-7.5 earthquakes have been recorded in the west Beijing basin-range tectonic region (38.3°-41.5°E, 112°-116.2°N), a region mainly under the action of tensional normal faulting. In this paper, we calculate the Coulomb stress change of each earthquake and the cumulative Coulomb stress change, and on this basis we analyze the stress triggering of strong earthquakes. The research shows that there are 10 of 14 earthquakes that occurred in the trigger zones, in which the Coulomb stress change is positive, and the trigger rate is 71%. The positive areas of cumulative Coulomb stress change caused by these 15 earthquakes are: middle of northern Liulengshan fault, Northern Huaizhuo basin fault, Xinbao'an-Shacheng fault, Sangganhe fault and Southern Yuxian basin fault. This necessarily increases the seismic risk of these faults and can be used as a reference for future seismic risk analysis in this area.
Key words:  West Beijing basin-range tectonic region  Cumulative Coulomb stress change Seismic risk