孝丰—三门湾断裂广德—杭州段第四纪活动性研究

Quaternary Activity along the Guangde-Hangzhou Section of the Xiaofeng-Sanmenwan Fault

摘要:

孝丰—三门湾断裂是浙江地区一条规模较大的NW向断裂,该断裂与萧山—球川断裂交汇处曾发生929年杭州5 1/4级地震,与余姚—丽水断裂交汇处曾发生1998年嵊州—新昌4.5级地震。研究认为孝丰—三门湾断裂广德—杭州段大致以苏州—安吉断裂和湖州—临安断裂为界,分为广德—安吉段、安吉—黄湖段和黄湖—瓶窑段,活动性质为正断层,倾向NE。通过野外地质地貌调查和ESR年龄样品测年认为,该断裂最新活动时代为中更新世晚期。

Abstract:

The Xiaofeng-sanmenwan fault is a large-scaled NW trending fault in Zhejiang Province,The M5 1/4 Hangzhou earthquake of 929CE and the M4.5 Shengzhou-Xinchang earthquake of 1998 occurred at the intersection of the Xiaoshan-Qiuchuan fault and the Yuyao-Lishui fault. In this paper,the Guangde-Hangzhou segment of Xiaofeng-Sanmenwan fault in the is divided into the Guangde-Anji segment,the Anji-Huanghu segment and the Huanghu-Pingyao segment by the Suzhou-Anji fault and the Huzhou-Lin'an fault,characterized by normal fault. Based on field geological survey and the ESR dating result,it is concluded that the latest active time of the fault is in late Middle Pleistocene.