蒙山山前断裂第四纪活动特征分析

doi:10.12196/j.issn.1000-3274.2023.03.005

Abstract

Abstract: The Mengshan piedmont fault is a relatively active NW trending fault in the western Shandong block. In order to study its Quaternary activity characteristics, the latest activity and deep structure of the Mengshan piedmont fault have been preliminarily studied by using field observation, trench profile analysis, geochronology measurement and other methods in combination with gravity anomaly characteristics, which is of great significance for evaluating the seismic risk of the Mengshan piedmont fault. The results show that: ① Since the Quaternary, the Mengshan piedmont fault is mainly characterized by sinistral strike-slip and normal fault movement. The fault, bounded by Yujiazhuang Village, is divided into east and west sections. The western section has not been active since the Quaternary, while the eastern section has been active mainly in the late Pleistocene. ② The Mengshan Piedmont fault cuts deep to the middle and lower crust, which is a deep major fault. ③ There may have been two paleoseismic events in the Mengshan Piedmont fault since the late Pleistocene, (44.1±3.4)~(24.3±1.2) ka and (22.7±1.8)~(6.2±0.5) ka, respectively. ④ There have been many M≈5 earthquakes the fault zone, which has the potential risk of triggering moderate and strong earthquakes. It is suggested to strengthen the in-depth study of the fault in the future.

Key words: Mengshan piedmont fault, Fault activity, Deep feature, Paleo-earthquake

CLC Number:

P315.2

FENG Jian-guo, ZHAO Yao, WANG Ji-qiang, GAO Zong-jun, WANG Hua-lin, GE Fu-gang. Study on Quaternary Activities Characteristics of the Mengshan Piedmont Fault[J]. EARTHQUAKE, 2023, 43(3): 66-76.

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Study on Quaternary Activities Characteristics of the Mengshan Piedmont Fault

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