新疆伽师地区地壳三维速度结构及中强震震源机制揭示的区域孕震环境

梁姗姗; 徐志国; 黄小宁; 张广伟; 邹立晔; 周元泽

doi:10.3799/dqkx.2023.165

Volume 49 Issue 2

Feb. 2024

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Article Navigation > Earth Science > 2024 > 49(2): 451-468

Liang Shanshan, Xu Zhiguo, Huang Xiaoning, Zhang Guangwei, Zou Liye, Zhou Yuanze, 2024. Regional Seismogenic Environment Revealed by the 3D Crustal Velocity Structure and Focal Mechanism of Moderate and Strong Earthquakes in Jiashi Area, Xinjiang, China. Earth Science, 49(2): 451-468. doi: 10.3799/dqkx.2023.165

Citation:

Liang Shanshan, Xu Zhiguo, Huang Xiaoning, Zhang Guangwei, Zou Liye, Zhou Yuanze, 2024. Regional Seismogenic Environment Revealed by the 3D Crustal Velocity Structure and Focal Mechanism of Moderate and Strong Earthquakes in Jiashi Area, Xinjiang, China. Earth Science, 49(2): 451-468. doi: 10.3799/dqkx.2023.165

Citation:

Liang Shanshan, Xu Zhiguo, Huang Xiaoning, Zhang Guangwei, Zou Liye, Zhou Yuanze, 2024. Regional Seismogenic Environment Revealed by the 3D Crustal Velocity Structure and Focal Mechanism of Moderate and Strong Earthquakes in Jiashi Area, Xinjiang, China. Earth Science, 49(2): 451-468. doi: 10.3799/dqkx.2023.165

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Regional Seismogenic Environment Revealed by the 3D Crustal Velocity Structure and Focal Mechanism of Moderate and Strong Earthquakes in Jiashi Area, Xinjiang, China

doi: 10.3799/dqkx.2023.165

Liang Shanshan^{1, 2
,
,},
Xu Zhiguo^{3, 4},
Huang Xiaoning⁵,
Zhang Guangwei⁶,
Zou Liye²,
Zhou Yuanze^{1
,
,
,}

1.
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
2.
China Earthquake Networks Center, Beijing 100045, China
3.
National Marine Environmental Forecasting Center, Beijing 100081, China
4.
Key Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Beijing 100081, China
5.
Kunlun Digital Technology Company Limited, Beijing 100007, China
6.
National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing 100085, China

Received Date: 2023-01-29
Publish Date: 2024-02-25

Abstract

Abstract

In order to discuss in detail the relationship between the fine velocity structure of the upper crust and seismic activity in the Jiashi area, this paper used the double⁃difference tomography method to obtain the earthquakes precise relocation results and high⁃resolution three⁃dimensional V_P and V_S velocity structuresin the Jiashi region(76.5°E⁃78.0°E, 39.3°N⁃40.3°N)with the seismic phase observation and broadband waveform provided by the Xinjiang Digital Seismic Network since 2009. The full moment tensor solutions of earthquakes with M_S≥ 5.0 in the 2020 M_S6.4 Jiashi earthquake sequence arecalculated, and the spatiotemporal distribution characteristics of earthquakes in this region are comprehensively studied.Theresults indicate that the earthquake distribution after relocation in this area has a poor correlation with distribution of the known faults. The 2020 M_S6.4 Jiashi earthquake sequence was distributed in two dominant striking direction: NNW and near EW. The aftershocks were mainly distributed on and near the Ozgertau fault with near EW⁃striking, about 20km away from the mainshock, within 48 hours after the earthquake. The full moment tensor solutions of the four moderately strong earthquakes in the sequence show significant non double⁃couple components, all of which are compressive fractures with reduced volume. The results show that there is obvious heterogeneity in the crustal velocity structure in the Jiashiarea., the epicenter of the 2020 M_S6.4 Jiashi earthquake is located within high P⁃velocity zones, the margin of hightS⁃velocity zones and low V_P/V_S, zones, there are large⁃scale S⁃wave low velocity anomalies in the middle and lower crust. Integrated with the regional tectonics and previous research results, we believe that the seismogenic structure of the M_S6.4 mainshock in 2020 is the near EW buried nappe blind reverse fault in the Kepingtag nappe, and its conjugate NNW buried fault also participated in the seismogenic process of the entire M_S6.4 Jiashi earthquake sequence.The frequent occurrence of strong earthquakes in Jiashi area is the result of the tectonic movement of the Tarim Basin, which continues to subduct and compress towards the southern Tianshan Mountains, triggering the activities of nappe structures and several hidden faults at the junction of basin and mountain. The strong lateral heterogeneity of fine velocity structure also leads to the diversity of focal mechanisms.
- Jiashi region,
- earthquake location,
- velocity structure,
- full moment tensor solution,
- seismogenic environment

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