Late Quateranry paleoseismicity of the Xitieshan-Amunikeshan section of the northern margin fault of the Qaidam Basin

YAO Shenghai; GAI Hailong; YIN Xiang; LIU Wei; ZHANG Jiaqing; ZHANG Zhanxian

doi:10.12090/j.issn.1006-6616.2023114

Volume 30 Issue 2

Apr. 2024

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Article Navigation > Journal of Geomechanics > 2024 > 30(2): 260-274

YAO Shenghai, GAI Hailong, YIN Xiang, et al., 2024. Late Quateranry paleoseismicity of the Xitieshan-Amunikeshan section of the northern margin fault of the Qaidam Basin. Journal of Geomechanics, 30 (2): 260-274. DOI: 10.12090/j.issn.1006-6616.2023114

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Late Quateranry paleoseismicity of the Xitieshan-Amunikeshan section of the northern margin fault of the Qaidam Basin

doi: 10.12090/j.issn.1006-6616.2023114

1.
Qinghai Earthquake Agency, Xining 810001, Qinghai, China
2.
Qinghai China Coal Geological Engineering Co, Ltd., Xining 810010, Qinghai, China

Funds:

the Basic Research Project of the Science and Technology Department of Qinghai Province 2018-ZJ-746

More Information

Received: 2023-07-05
Revised: 2024-02-25
Accepted: 2024-03-04

Available Online: 2024-04-15

Published: 2024-04-28

Abstract

Abstract

Objective The northern margin fault zone of the Qaidam Basin is a regional active fault zone in the northern part of the Qinghai-Tibet Plateau, forming the boundary fault of the northern Qaidam Basin and the Qilian Mountains. Studying its late Quaternary paleoseismic activity is of great significance for understanding the seismic recurrence cycle and seismic hazard of the northern margin fault zone of the Qaidam Basin. Methods Through geological survey, remote sensing interpretation, trench excavation, OSL geological dating, and analysis of paleoseismic events, the paleoseismic events of the northern margin fault of the Qaidam Basin (Xitieshan-Amunikeshan section) were studied. Conclusion The study reveals that the trench profiles exposed five relatively reliable paleoseismic events, with occurrence times of approximately 60 years ago for Event E1, 3.1±0.3 to 3.4±0.3 ka for Event E2, 7.5±0.3 to 8.1±0.3 ka for Event E3, 10.1±0.4 to 11.4±0.4 ka for Event E4, and 12.1±0.4 to 12.8±0.4 ka for Event E5. Using the paleoseismic incremental limiting method, the seismic recurrence cycle of the northern margin fault of the Qaidam Basin (Xitieshan-Amunikeshan section) is estimated to be 2.6 to 3.4 ka. The most recent event departure time for the Amunikeshan section is 60 years ago, and for the Xitieshan section, it is 3.1±0.3 ka, suggesting a higher likelihood of destructive earthquakes in the future for the Xitieshan section compared to the Amunikeshan section of the northern margin fault of the Qaidam Basin. Significance This result can provide a better understanding of the paleoseismic events, recurrence intervals, and other aspects of the northern margin fault of the Qaidam Basin, which has guiding significance for seismic forecasting, prediction, and evaluation of future seismic hazards of this fault.
- northern margin fault of the Qaidam Basin,
- Xitieshan-Amunikeshan section,
- paleoearthquake,
- most recent departure time,
- recurrence interval

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