山西断陷系交城断裂全新世古地震活动初步研究
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摘要
断错地貌调查及探槽开挖表明 ,晋中盆地西界分布的黄土台地的前、后缘均存在断层 ,断层的最新活动位于地表陡坎的前缘 ,地表见到的断层最新活动断面的上升盘是早全新世地层。同时 ,新民探槽开挖表明 ,该断裂在早全新世以后曾发生三次古地震事件 ,最新一次活动接近距今 2 74 8a,另两期古地震事件的时间分别距今 4 0 37～ 5 91 0a及 836 0～ 5 91 0a。如果取后两次古地震事件时间跨度的中值 ,这三次古地震事件的间隔分别是 2 2 2 5a和 2 1 6 2a ,平均 2 1 93a。
The Jiaochen fault is located at the western margin of the Jinzhong basin in Shanxi province.The investigation shows that the front and back borders of the loess platform along the western margin of the Jinzhong basin are controlled by the faults.The latest activity of the fault is along the front of the ground scarp.The upthrown block of the latest active fault is the stratum of Early Holocene.And it shows by research on the Xinming trench that three paleoearthquakes have been occurred since Early Holocene along the Jiaochen Fault.The latest activity occurred nearly 2,748 years ago.The other two events occurred respectively about 4,037～5,910 years ago and about 5,910～8,360 years ago.Assuming that the dates of the last two events are the mid values, the intervals of the paleoearthquake events is about 2,225 and 2,162 years.The average interval of the events is about 2,193 years.
The Jiaochen fault is located at the western margin of the Jinzhong basin in Shanxi province.The investigation shows that the front and back borders of the loess platform along the western margin of the Jinzhong basin are controlled by the faults.The latest activity of the fault is along the front of the ground scarp.The upthrown block of the latest active fault is the stratum of Early Holocene.And it shows by research on the Xinming trench that three paleoearthquakes have been occurred since Early Holocene along the Jiaochen Fault.The latest activity occurred nearly 2,748 years ago.The other two events occurred respectively about 4,037～5,910 years ago and about 5,910～8,360 years ago.Assuming that the dates of the last two events are the mid values, the intervals of the paleoearthquake events is about 2,225 and 2,162 years.The average interval of the events is about 2,193 years.
引文
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[4]江娃利,聂宗笙,张康富.山西交城断裂断错全新世洪积扇(简报)[J].地震地质,1992,14(3):216.
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[6]程新原,侯廷爱.交城断裂中段的活动特征及其地震危险性[J].山西地震,1996,(3):28-32.
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