Avoidance distance and influence range of active faults: A case study of Litang fault

YANG Zhen; ZHONG Ning; ZHANG Xianbing; YU Hao; GUO Changbao; LI Haibing

doi:10.12090/j.issn.1006-6616.2023085

Volume 31 Issue 1

Feb. 2025

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YANG Z，ZHONG N，ZHANG X B，et al.，2025. Avoidance distance and influence range of active faults: A case study of Litang fault[J]. Journal of Geomechanics，31（1）：124−138 doi: 10.12090/j.issn.1006-6616.2023085

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Avoidance distance and influence range of active faults: A case study of Litang fault

doi: 10.12090/j.issn.1006-6616.2023085

YANG Zhen^{1, 2
,},
ZHONG Ning^{1, 3
,
,},
ZHANG Xianbing^{1, 2},
YU Hao^{1, 2},
GUO Changbao^{1, 3},
LI Haibing⁴

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
3.
Research Center of Neotectonism and Crustal Stability, China Geological Survey, Beijing 100081, China
4.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Funds: This research is financially supported by National Natural Science Foundation of China (Grant No. 42177184); Project of China Geological Survey (Grant No. DD20221816) and Chinese Postdoctoral Science Foundation (Grant No. 2019M650788).

More Information

Received: 2023-05-29
Revised: 2024-11-05
Accepted: 2024-11-12
Published: 2025-02-27

Abstract

Abstract

Objective Active faults can not only trigger strong earthquakes, but also cause engineering breaks, creep deformation, and geological disasters, which seriously threaten the planning, construction, and safe operation of major projects. Methods In this study, based on the statistics of coseismic surface ruptures, the avoidance distances of faults with different properties and the ranges of extremely strong, strong, less strong, and moderately affected areas of active fault zones are established. Remote sensing, a geological survey, dislocation landforms, and shallow seismic exploration were used to analyze, the avoidance distance and affected area of the Litang fault on the Qinghai-Tibet Plateau. Conclusion This study concludes that the hanging wall and footwall avoidance distances of normal faults are not less than 30 m and 15 m, respectively; the hanging wall and footwall avoidance distances of thrust faults are not less than 45 m and 15 m, respectively; the avoidance distance of strike-slip faults is not less than 30 m. The Litang fault is mainly characterized by strike-slip with normal fault components, and its hanging-wall avoidance distance is 30 m and its footwall avoidance distance is 15 m. The extremely strong, strongly, less strong, and moderately affected areas of the Litang fault zones are 154 m, 154-500 m, 500-1000 m, and 1000-3000 m, respectively. [Significance] The research provides basic data for the planning and construction of major projects and the spatial control of the national land.
- active faults,
- avoidance distances,
- influence range,
- Litang fault,
- Qinghai-Tibet Plateau

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