郯庐断裂带安丘—莒县断裂南段(郯城—淮河)晚第四纪活动特征

Late Quaternary Activity in the Southern Segment of the Anqiu-Juxian Fault of the Tan-Lu Fault Zone

通过系统的野外地质地貌调查、浅层地震勘探、钻孔联合剖面和古地震探槽等多方法手段,重点开展郯庐断裂带安丘—莒县断裂南段晚第四纪活动特征研究。结果显示安丘—莒县断裂南段在浅部由2支高倾角兼有挤压逆冲分量的断层组成,其中一支出露地表,以右旋走滑运动为主兼有逆冲分量,是全新世活动断层,而另一支为晚更新世活动断层。

In this paper,based on field geological investigations,shallowseismic exploring,composite drilling and paleoseismic trenching,we focus on structural framework and late Quaternary activity in the southern segment of the Anqiu-Juxian fault. The results showthat the Anqiu-Juxian fault is composed of two high dip branch fault in the shallow. Both branch faults are shown as the reversed fault in the profile. One of them that has outcrop shows a right-lateral strike-slip fault in the plane. The exposed branch fault is a Holocene active fault,and the other is late Pleistocene active fault.