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Wei X, Jiang H, Shi W, Fan J, Xu H, Hu W, Chang X, Huang S, Guo Q, Zhang S, Yang Y, Wang Y. Earthquake supercycles and fault interaction over the past 32 ka in the Lake Ebinur area, Xinjiang, China. Sci Total Environ 2024; 927:172052. [PMID: 38554972 DOI: 10.1016/j.scitotenv.2024.172052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2024] [Revised: 03/18/2024] [Accepted: 03/26/2024] [Indexed: 04/02/2024]
Abstract
Earthquake prediction and disaster assessment in tectonically active regions require a continuous and complete regional seismic archive, which is commonly difficult to obtain, especially for prehistoric records. Here, high-resolution analysis of the sedimentary sequence from Lake Ebinur in Xinjiang revealed a detailed history of environment evolution since 32 ka ago. Both the Cl content and ultrafine proportion revealed the changing climate: the climate was relatively dry with low lake-water volumes from 32 to 12 ka, while the climate became warmer and wetter since 12 ka. In addition, eight earthquakes were identified by comprehensive analysis of grain size and geochemical element proxies, showing more than two seismic supercycles, with gaps of ∼10.4 ka; these gaps are much larger than those inferred previously (∼4-7 ka). Notably, these seismic events exhibited a pattern of mutual transmittance between the BoA and Jinghenan faults. Such fault interaction can occur in the Lake Ebinur area because it is dominated by weak lithosphere in which strain is easily accumulated and released; the interaction can also be attributed to the unique spatial distribution and immature nature of both faults. Combined with trenching investigations, our high-resolution analysis of lacustrine sediments can reveal a complete history of tectonic activity, which can efficiently serve regional earthquake prediction and disaster assessment.
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Affiliation(s)
- Xiaotong Wei
- State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
| | - Hanchao Jiang
- State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China; Xinjiang Pamir Intracontinental Subduction National Field Observation and Research Station, Beijing 100029, China; Lhasa Geophysical National Observation and Research Station, Institute of Geology, China Earthquake Administration, Beijing 100029, China.
| | - Wei Shi
- State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
| | - Jiawei Fan
- State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
| | - Hongyan Xu
- State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
| | - Weihua Hu
- Earthquake Agency of Xinjiang Uygur Autonomous Region, Urumqi, Xinjiang 830011, China
| | - Xiangde Chang
- Earthquake Agency of Xinjiang Uygur Autonomous Region, Urumqi, Xinjiang 830011, China
| | - Shuaitang Huang
- Earthquake Agency of Xinjiang Uygur Autonomous Region, Urumqi, Xinjiang 830011, China
| | - Qiaoqiao Guo
- State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
| | - Siqi Zhang
- State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
| | - Yanming Yang
- State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China; Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot, Inner Mongolia 010010, China
| | - Yanwen Wang
- State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
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