首页|期刊导航|中国地震研究(英文版)|Study on Holocene Paleoearthquakes in Xizhang Trench on the Jiaocheng Fault Zone,Shanxi Province
中国地震研究(英文版)2008，Vol.22Issue(4)：428-439,12.
Study on Holocene Paleoearthquakes in Xizhang Trench on the Jiaocheng Fault Zone,Shanxi Province
Study on Holocene Paleoearthquakes in Xizhang Trench on the Jiaocheng Fault Zone,Shanxi Province
摘要
Abstract
Xizhang trench is located 10 km northwest of Taiyuan city,Shanxi Province,in front of a NNW-trending scarp of 4.6m height on the northern segment of the Jiaocheng fault zone.The dimensions of the trench are 108m in length,8m in width,and 10m in depth.There are 18 horizons revealed in the trench.The upper strata are sandy loam;the upper strata of the downthrown block of the fault are gravels,the lower ones are an interbed of brown loam and sandy loam.The strata on the upthrown block of the fault are sandy loam containing gravel.The trench shows 3 fault planes,and the upper offset point on the fault plane is 1.5m below the ground surface,the newest dislocated stratum is (3.74±0.06)ka BP.The trench reveals a lot of deformation traces,such as fault planes,dislocated strata,collnvial wedges and formation tilting.The relationship between strata and faults in the trench shows that 3 paleoearthquake events have occurred at the Jiaocheng fault zone since the Early Holocene,they are about (3.74+0.06)～(3.06±0.26)ka BP,(8.35±0.09)ka～ (3.74±0.06)ka BP,and(10.66±0.85)～(8.35±0.09)ka BP.The average interval among the events is 2.6～3.6ka.The minimum coseismic vertical displacements of the 3 events are 3.0m,2.5m and 3.2m,respectively.The significance of Xizhang trench is that the Jiaocbeng fault used to be active thousands of years ago,though there is no M≥ 7.0 earthquake recorded in historical documents.Evidence of new Jiaocheng fault zone activity during the Holocene is important for the earthquake safety assessment of Taiyuan city in the future.关键词
Paleoearthquake/Holocene/Xizhang trench/Jiaocheng fault/ShanxiKey words
Paleoearthquake/Holocene/Xizhang trench/Jiaocheng fault/Shanxi分类
天文与地球科学引用本文复制引用
Xie Xinsheng,Sun Changbin,Yan Chengguo,Zhao Jinquan,Jiang Wali,An Weiping,Li Zihong,Zhang Dawei,Cheng Xinyuan,Gao Shuyi,Wang Chunhe..Study on Holocene Paleoearthquakes in Xizhang Trench on the Jiaocheng Fault Zone,Shanxi Province[J].中国地震研究(英文版),2008,22(4):428-439,12.基金项目
This project was sponsored by the program of"Active Fault Test Detection in City" of the National Development and Reform Commission,PRC. （）
