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2024 Vol. 30, No. 2
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WANG Shiyuan, WANG Jing, LI Fupeng, TAO Zhigang, LIANG Mingjian, LIU Shao, QU Miao, ZHANG Liwen, ZENG Weizu, JIN Yunxia. 2024. Late quaternary slip rate and paleoseismic sequence of the Cuopuhu section of the Litang-Yidun fault, western Sichuan, China. Journal of Geomechanics, 30(2): 275-288. doi: 10.12090/j.issn.1006-6616.2023060
Citation: WANG Shiyuan, WANG Jing, LI Fupeng, TAO Zhigang, LIANG Mingjian, LIU Shao, QU Miao, ZHANG Liwen, ZENG Weizu, JIN Yunxia. 2024. Late quaternary slip rate and paleoseismic sequence of the Cuopuhu section of the Litang-Yidun fault, western Sichuan, China. Journal of Geomechanics, 30(2): 275-288. doi: 10.12090/j.issn.1006-6616.2023060
shu

Late quaternary slip rate and paleoseismic sequence of the Cuopuhu section of the Litang-Yidun fault, western Sichuan, China

  • 1.

    Sichuan Earthquake Agency, Chengdu 610041, Sichuan, China

  • 2.

    School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

  • 3.

    Panzhihua Earthquake Monitoring Center, Panzhihua 617000, Sichuan, China

    • Fund Project: This research is financially supported by the National Natural Science Foundation of China(Grant No.2019QZKK0708), the Spark Program of the China Earthquake Administration(Grant No.XH24036B), and the Scientific Research Fund of the Institute of Engineering Mechanics, China Earthquake Administration(Grant No.2021EEEVL0101)
More Information
Received Date:  20 April 2023
Revised Date:  28 February 2024
Accepted Date:  13 March 2024
Available Online:  21 March 2024
Publish Date:  28 April 2024
    Abstract
  • Objective

    The Litang-Yidun fault is a left-lateral strike-slip active fault zone extending approximately 130 km in the Sichuan-Yunnan rhombic block in the Holocene. As a significant seismogenic structure controlling seismic activity in the Litang area of western Sichuan, research on both paleoseismicity and surface ruptures primarily focuses on the Litang and Damaoyaba sections, with relatively limited study on the Cuopuhu section in the northern part. Detailed investigation of the Cuopuhu section can provide fundamental information on its activity characteristics, paleoseismic events, and slip rates.

     Methods

    The Cuopuhu section of the Litang-Yidun fault was investigated using field surveys, high-precision mapping, trenching, and 14C dating methods to explore its slip rate and paleoseismic events. Two trench sites were excavated at the foothills of Dongou Mountain to identify the relationships between faulting and strata, sedimentary characteristics, and fault motion.

     Conclusion

    Four paleoseismic events were identified: Event Ⅰ occurred before BC 3382±60 a; Event Ⅱ occurred between BC 3382±60 a and BC 1094±51 a; Events Ⅲ and Ⅳ occurred after AD 1330±44 a. The recurrence intervals of the four earthquakes are approximately 0.4±0.3 ka, 2.42±0.1 ka, and 2.40±0.1 ka, respectively. Based on the calculated intervals, Events Ⅰ and Ⅱ, and Events Ⅱ and Ⅲ, Ⅳ, have recurrence intervals of about 2.4 ka. Events Ⅲ and Ⅳ occurred after AD 1330±44 a, making it difficult to determine their sequence and exact timing. It can be inferred that the Cuopuhu section of the Litang-Yidun fault likely has a recurrence interval of about 2.4 ka for paleoseismic events, with a possibility of seismic events with recurrence intervals of 0.4±0.3 ka. By comparing the research data between the Cuopuhu section and the Litang and Damaoyaba segments, differences in paleoseismic events between the Cuopuhu section and the other sections are evident. However, the seismic activity of different fault sections has shown a sustained strengthening trend since the Holocene. Based on mapped fault scarps and moraine ridges from the last glacial period, the average slip rate of the Cuopuhu section since the Late Pleistocene is estimated to be 4.15±0.5 mm/a, similar to the slip rates of different branches of the Litang-Yidun fault in the late Quaternary period.

     Significance

    This study provides information on the tectonic features, paleoseismicity, and slip rates of the Litang-Yidun fault, aiding in a better understanding of the seismic history and structural deformation patterns in the area and giving more data for medium- and long-term earthquake prediction in the future. It also contributes to the seismic risk assessment of relevant projects along the Sichuan-Tibet Railway.
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