山西交城断裂带第四纪活动习性及其分段特征
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摘要
<正> 交城断裂是山西断陷带中部太原盆地西边界的主控断裂,对太原盆地的形成和演化起着十分重要的作用。晚新生代以来,该断裂带活动强烈,构造地貌显著,分段活动性明显。历史上,太原盆地北部的忻定盆地和南部的临汾盆地都发生过M≥7.0级强震(临汾盆地2次,忻定盆地3次),而太原盆地历史上仅记载过29余次中强地震,最大震级6(1/2)级。在历史上,太原盆地究竟有没有发生过M≥7.0级古地震事件?对未来地震的危险性如何评估?是人们所关注和待研究的问题。通过此题地质地貌调查,探槽、剥土工程和断层年代测定等方面的研究,基本搞清了这条长125km断裂带的几何结构、运动性质、
The Jiaocheng Fault is the northwestern boundary fault of the Taiyuan basin in Shanxi province.It is a normal fault with some right-lateral strike—slip component.Its geometry,evolution history,slip rate,active events in Holocene,and segmentation are precisely studied in details in this paper on the bases of air-photo interpretation,geological and morphological investigation,trenching and sample dating.According to the geometric discontinuity and the difference in behavior,the whole fault can be divided into 5 segments.Of which,the Qingxu segment is active in Holocene.It is estimated that the maximum dip-slip rate reached 1.3 mm/a since the mid-Holocene.There were two paleo-earthquakes occurred in the segment in the early to mid—Holocene.
The Jiaocheng Fault is the northwestern boundary fault of the Taiyuan basin in Shanxi province.It is a normal fault with some right-lateral strike—slip component.Its geometry,evolution history,slip rate,active events in Holocene,and segmentation are precisely studied in details in this paper on the bases of air-photo interpretation,geological and morphological investigation,trenching and sample dating.According to the geometric discontinuity and the difference in behavior,the whole fault can be divided into 5 segments.Of which,the Qingxu segment is active in Holocene.It is estimated that the maximum dip-slip rate reached 1.3 mm/a since the mid-Holocene.There were two paleo-earthquakes occurred in the segment in the early to mid—Holocene.
引文
① 山西省地矿局石油普查勘探大队,晋中断陷石油普查评价报告,1979．
① 中国地震局地壳应力研究所,万家寨引黄工程南干连接段断裂稳定性评价报告,1997。
② 山西地震局,太原市城市抗震防震规划基础工作研究报告,1998．
③ 山西地震局地震工程研究所,黄河水源太原市城市给水工程净水厂部分工程建设场地安全性评价报告,1996。
[1] 江娃利等,山西交城断裂全新世活动证据及第四纪活动历史,地壳构造应力文集(6) ,北京:地震出版社,1993．
① 中国地震局地壳应力研究所,万家寨引黄工程南干连接段断裂稳定性评价报告,1997。
② 山西地震局,太原市城市抗震防震规划基础工作研究报告,1998．
③ 山西地震局地震工程研究所,黄河水源太原市城市给水工程净水厂部分工程建设场地安全性评价报告,1996。
[1] 江娃利等,山西交城断裂全新世活动证据及第四纪活动历史,地壳构造应力文集(6) ,北京:地震出版社,1993．
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