Volume 28 Issue 6
Dec.  2022
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Article Navigation >  Journal of Geomechanics  > 2022  >  28(6): 969-980
HAN Mingming, CHEN Lichun, ZENG Di, et al., 2022. Discussion on the latest surface ruptures near the Zhonggu village along the Selaha segment of the Xianshuihe fault zone. Journal of Geomechanics, 28 (6): 969-980. DOI: 10.12090/j.issn.1006-6616.20222824
Citation: HAN Mingming, CHEN Lichun, ZENG Di, et al., 2022. Discussion on the latest surface ruptures near the Zhonggu village along the Selaha segment of the Xianshuihe fault zone. Journal of Geomechanics, 28 (6): 969-980. DOI: 10.12090/j.issn.1006-6616.20222824
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Discussion on the latest surface ruptures near the Zhonggu village along the Selaha segment of the Xianshuihe fault zone

doi: 10.12090/j.issn.1006-6616.20222824
  • 1.

    Chengdu Center of China Geological Survey, Chengdu 610081, Sichuan, China

  • 2.

    Institute of Geology, China Earthquake Administration, Beijing 100029, China

  • 3.

    College of Earth Sciences, Guilin University of Technology, Guilin 541006, Guangxi, China

  • 4.

    Sichuan Earthquake Administration, Chengdu 610041, Sichuan, China

  • 5.

    School of Earth Science and Engineering, Hebei University of Engineering, Handan 056038, Hebei, China

Funds:

the Second Tibetan Plateau Scientific Expedition and Research Program 2019QZKK0901

the National Natural Science Foundation of China 41372218

the Geological Survey Project of the China Geological Survey Bureau DD20221811

the Geological Survey Project of the China Geological Survey Bureau DD20221635

More Information
  • Received: 2022-06-17
  • Revised: 2022-09-10
    Abstract

  • The Selaha segment of the Xianshuihe fault zone was the seismogenic fault of the 2014 Kangding MS 6.3 earthquake. This segment has been considered as one of the most dangerous areas for surface rupture-induced earthquakes with a magnitude of M≥7 due to the long elapsed time of the latest surface rupture event (the 1725 Kangding MS7.0 earthquake). Obtaining the spatial distribution of the latest seismic surface rupture along the Selaha fault is significant for determining the seismic activity history, assessing the seismic potential, and preventing and mitigating disasters. However, there is still considerable controversy about the extension northwestern of the latest surface rupture. In order to solve this problem, we excavated two large paleoseismic trenches in the Zhonggu village where the previous data believed that there was no coseismic surface rupture, and obtained the rupture history of this region. The latest event (E6) occurred after A.D.746±51. Based on the trench profile evidence, geomorphological features, and historical earthquake records, the latest event E6 is associated with the 1725 Kangding MS7.0 earthquake, indicating that the surface rupture of the event E6 has extended to at least the Zhonggu village.

     

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