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
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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基于定量形态学和多种测年方法的基岩断层坎地震史：以中国晋西南裂谷落云山山前断层为例
DOI：
10.1016/j.tecto.2020.228473
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发表时间：
2020-08
期刊：
影响因子：
2.9
通讯作者：
Zhou Chao
中科院分区：
文献类型：
--
作者：
Zou Junjie;He Honglin;Yokoyama Yusuke;Shirahama Yoshiki;Sproson Adam D.;Wei Zhanyu;Shi Feng;Hao Haijian;Miyairi Yosuke;Lu Lixing;Su Peng;Zhou Chao
在传统探槽技术无法应用的基岩地区，基岩断层陡坎的研究是识别古地震和获取断层历史的有效方法。本文报道了对山西裂谷西南部落云山皮埃蒙特断裂的研究。虽然一些研究已经分析了LYSPF，其断层行为仍然存在争议。例如，构造地貌学无法确定过去滑动的频率和经过的时间。为了解决这些问题，我们调查了两个基岩断裂面，罗云村（北方段）和魏村（南段）使用定量形态分析结合多种第四纪测年技术。定量形态分析表明，两基岩断层面均具有垂向分段的特征。这种分段表明，断层面是间歇性的，可能是由于周期性的断层地震。因此，地震事件可以被识别为形态段，相应的同震位移可以由这些段的高度确定。根据定量形态学和测年技术的结果，北方段晚更新世发生了4次地震，同震垂直位移分别为0.9m、0.82m、1.64 ~ 2.38m和2.30 ~ 2.54m;南段的同震垂直位移约为1.33 m，南段的垂直位移约为1 ~ 1.08 m，均发生在全新世。结合裂点序列和LYSPF探槽技术的研究结果，共识别出45 ka以来的8次古地震事件，平均重复间隔为5.8kyr。更完整的古地震序列还表明，沿LYSPF的滑动速率沿着的变化可能取决于该段，并且在WC断层面记录到了649年的LupeM 7½地震产生的位移。
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.
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