气候变化领域集成服务门户(CCPortal): Seismic history of a bedrock fault scarp using quantitative morphology together with multiple dating methods: A case study of the Luoyunshan piedmont fault, southwestern Shanxi Rift, China

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DOI	10.1016/j.tecto.2020.228473
	Seismic history of a bedrock fault scarp using quantitative morphology together with multiple dating methods: A case study of the Luoyunshan piedmont fault, southwestern Shanxi Rift, China
	Zou J.; He H.; Yokoyama Y.; Shirahama Y.; Sproson A.D.; Wei Z.; Shi F.; Hao H.; Miyairi Y.; Lü L.; Su P.; Zhou C.
发表日期	2020
ISSN	00401951
卷号	788
英文摘要	The study of bedrock fault scarps is a useful approach to identify paleo-earthquakes and acquire the faulting history in bedrock areas where traditional trench techniques are not applicable. Here, we report a study on the Luoyunshan piedmont fault (LYSPF), southwestern Shanxi Rift, China. Although several studies have analyzed the LYSPF, its faulting behavior is still under debate. For example, the tectonic geomorphology fails to determine the frequency of past slips and the elapsed time. To address these problems, we investigated two bedrock fault surfaces, Luoyuncun (northern segment) and Weicun (southern segment) using quantitative morphology analyses together with multiple Quaternary dating techniques. Quantitative morphology analysis shows that both bedrock fault surfaces have the characteristics of vertical segmentation. This kind of segmentation indicates that the fault surfaces are exhumed intermittently, likely owing to periodic faulting earthquakes. Therefore, earthquake events can be identified as morphological segments, and the corresponding co-seismic displacement can be determined by the height of these segments. According to the results from the quantitative morphology and dating techniques, four seismic events, with a co-seismic vertical displacement of 0.9 m, 0.82 m, 1.64 to 2.38 m and 2.30 to 2.54 m, on the northern segment occurred during the late Pleistocene, whereas, two seismic events, with a co-seismic vertical displacement of ~1.33 m and 1 to 1.08 m are identified on the southern segment occurred during the Holocene. Combined with the results of knickpoint series and trench techniques of the LYSPF, eight paleo-earthquake events were identified since 45 ka, with an average recurrence interval of 5.8 kyr. The more complete paleo-earthquake sequence also showed the possibility that the variation of the slip rate along the LYSPF depends on the segment, and that the displacement produced by the Linfen M 7½ earthquake of 649 CE has been recorded at the WC fault surface. © 2020
关键词	Bedrock fault surface morphology Cosmogenic nuclide 36Cl dating Luoyunshan piedmont fault OSL dating Paleo-earthquake history Radiocarbon dating
英文关键词	Earthquakes; Morphology; Co-seismic displacement; Earthquake events; Earthquake sequences; Quantitative morphology; Recurrence intervals; Tectonic geomorphology; Vertical displacements; Vertical segmentations; Fault slips; bedrock; coseismic process; dating method; earthquake event; fault displacement; fault scarp; geomorphology; seismicity; tectonic evolution; China; Luoyunshan Piedmont; Shanxi; Shanxi Rift
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207922
作者单位	State Key Laboratory of Earthquake Dynamics (Institute of Geology, China Earthquake Administration), Beijing, 100029, China; Department of Earth and Planetary Science, Graduate School of Science, the University of Tokyo, Tokyo, 277-8564, Japan; Research Institute of Earthquake and Volcano Geology, National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8567, Japan; Atmosphere and Ocean Research Institute, the University of Tokyo, Tokyo, 277-8564, Japan; Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; Shanxi Taiyuan Continental Rift Dynamics National Observation and Research Station, Taiyuan, 030025, China
推荐引用方式 GB/T 7714	Zou J.,He H.,Yokoyama Y.,et al. Seismic history of a bedrock fault scarp using quantitative morphology together with multiple dating methods: A case study of the Luoyunshan piedmont fault, southwestern Shanxi Rift, China[J],2020,788.
APA	Zou J..,He H..,Yokoyama Y..,Shirahama Y..,Sproson A.D..,...&Zhou C..(2020).Seismic history of a bedrock fault scarp using quantitative morphology together with multiple dating methods: A case study of the Luoyunshan piedmont fault, southwestern Shanxi Rift, China.Tectonophysics,788.
MLA	Zou J.,et al."Seismic history of a bedrock fault scarp using quantitative morphology together with multiple dating methods: A case study of the Luoyunshan piedmont fault, southwestern Shanxi Rift, China".Tectonophysics 788(2020).