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EARTHQUAKE ›› 2020, Vol. 40 ›› Issue (4): 115-128.doi: 10.12196/j.issn.1000-3274.2020.04.009

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The Surface Rupture Characteristics and Latest Activities of the Shuangshan—Lijiazhuang Fault

WANG Ji-qiang1,2, WANG Dong-lei1,2, LU Zi-lin1,2, ZHANG Jian-min1,2   

  1. 1. Earthquake Administration of Shandong Province, Jinan 250014, China;
    2. Earthquake Engineering Research Center of Shandong Province, Jinan 250021, China
  • Received:2019-06-24 Online:2020-10-30 Published:2020-10-23

Abstract: By means of geological and geomorphological investigation, trenching, engineering exploration and dating, the surface rupture morphology, latest activities and paleoearthquakes of the Shuangshan-Lijiazhuang fault have been studied in this paper. The results show that: ① The latest activity of the Shuangshan-Lijiazhuang fault occurred at the late Pleistocene, it is obviously dominated by left-lateral strike-slip faulting with normal components, and with thrusting components somewhere. According to the latest activities and geometry, it could be divided into 2 segments with the Shangwujing fault as the boundary, namely, the Shuangshan-Damashan segment (the south segment) and the Damashan-Wuli segment (the north segment). The south segment is characterized by left-lateral strike-slip motion and also consists of three sub-segments. The sub-segment between Shuangshan and Danhe Reservoir consists of two left-step en-echelon faults. The sub-segment from Danhe Reservoir to Yingzi Town consists of two intersected faults, among them the western branch is characterized by thrusting components and the late Pleistocene activities, while the eastern branch is characterized by normal faulting components and no Quaternary activities. The sub-segment between Yingzi and Damashan is covered by the Quaternary sediments and is dominated by left-lateral strike-slip motion with normal faulting. The north segment between Damashan and Wuli generally consists of multiple parallel thrust faults, which offsets the late Pleistocene strata. ② Since the late Quaternary Period, two paleo-earthquakes probably occurred along the Shuangshan-Lijiazhuang fault. The lower part of the late Pleistocene strata was offset at the early event, and the upper part of the late Pleistocene strata was offset at the latest event. ③ The seismo-tectonics of the 1829 Qingzhou-Linqu M61/4 earthquake is the “X” tectonic system which consisted of the Shangwujing fault and the Shuangshan-Lijiazhuang fault, but the Shuangshan-Lijiazhuang fault is probably the dominant structure according to its latest actives. There are several other late Pleistocene faults besides the Shuangshan-Lijiazhuang fault in the Luxi faulted block. All of these active faults have tectonic conditions for earthquakes with magnitude 6 or over, so attentions should be paid to the earthquake monitoring and active fault surveying and prospecting for better earthquake disaster mitigation in near future.

Key words: Shuangshan-Lijiazhuang fault, Surface rupture, Paleo-earthquake, Seismogenic structure

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