郯庐断裂带中段安丘—莒县断裂淮河—女山湖段几何展布

doi:10.12196/j.issn.1000-3274.2022.01.004

Abstract

Abstract: The latest active Anqiu—Juxian fault named F5 fault in the middle section of the Tanlu fault zone is an important seismically active fault in the eastern China. The present studies have shown that the F5 fault has extended southward into the Huaihe—Nvshan Lake in Anhui province, however, the specific geometrical distribution of this segment still has two major unresolved problems. Firstly, does the eastern fault of the Ziyang mountain belongs to the branch of F5 fault? secondly, does the F5 fault extend south to the northern shore of Nvshan Lake? In order to solve these problems, based on the methods of remote sensing interpretation, geomorphological survey, trench excavation and dating of faulted strata, we conducted research on the faults on the eastern side of Ziyang mountain and the faults along the northern shore of Nvshan Lake. The results show that the eastern fault of the Ziyang mountain developed at an older age, and experienced a strong thrust compression movement in the early and middle Pleistocene. It did not active since the late Quaternary and does not belong to the F5 fault branch. The Tan-Lu fault zone faulted the Late Pleistocene stratum in the ShangZhan area on the northern shore of Nvshan Lake. The F5 fault has completely penetrated between the Huaihe River and Nvshan Lake, its trace is single and continuous, with a total length of about 20 km. It has been discussed that the F5 fault could terminated southward from Nvshan Lake to Mingguang City. The termination of the fault is controlled by the regional ancient structural pattern, which indicating that the fault is both new and inherited.

Key words: Tanlu fault zone, Anqiu—Juxian fault, Late quaternary, Holocene, Trench

CLC Number:

P315.7

YANG Yuan-yuan, LI Peng-fei, FANG Liang-hao, LU Shuo, YAO Da-quan, ZHAO Peng, ZHENG Hai-gang, SHU Peng, ZHENG Ying-ping, PAN Hao-bo. Geometric Distribution of Huaihe—Nvshan Lake Section of Anqiu—Juxian Fault in the Middle Part of Tanlu Fault Zone[J]. EARTHQUAKE, 2022, 42(1): 54-69.

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Geometric Distribution of Huaihe—Nvshan Lake Section of Anqiu—Juxian Fault in the Middle Part of Tanlu Fault Zone

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