三峡库区巴东地震(<i>M</i><sub>s</sub>5.1)成因机制及次声波信号

李献瑞; 曾佐勋; 周强; 贺赤诚; 刘江平; 赵娟; 潘黎黎

doi:10.3799/dqkx.2014.163

Volume 39 Issue 12

Dec. 2014

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Article Navigation > Earth Science > 2014 > 39(12): 1793-1806

Li Xianrui, Zeng Zuoxun, Zhou Qiang, He Chicheng, Liu Jiangping, Zhao Juan, Pan Lili, 2014. Seismogenesis of Badong Earthquake (Ms 5.1) in Three Gorges Reservoir Area and Infrasound Anomaly. Earth Science, 39(12): 1793-1806. doi: 10.3799/dqkx.2014.163

Citation:

Li Xianrui, Zeng Zuoxun, Zhou Qiang, He Chicheng, Liu Jiangping, Zhao Juan, Pan Lili, 2014. Seismogenesis of Badong Earthquake (M_s 5.1) in Three Gorges Reservoir Area and Infrasound Anomaly. Earth Science, 39(12): 1793-1806. doi: 10.3799/dqkx.2014.163

Citation:

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Seismogenesis of Badong Earthquake (M_s 5.1) in Three Gorges Reservoir Area and Infrasound Anomaly

doi: 10.3799/dqkx.2014.163

Li Xianrui^{1, 2
,},
Zeng Zuoxun^{2, 3, 4
,
,},
Zhou Qiang⁵,
He Chicheng^{2, 4},
Liu Jiangping¹,
Zhao Juan^{3, 6},
Pan Lili^{2, 4}

1.
Institute of Geophysics & Geomatics, China University of Geosciences, Wuhan 430074, China
2.
Huazhong Tectonomechanical Research Center, Wuhan 430074, China
3.
Three Gorges Research Center for Geo-hazard, Ministry of Education, China University of Geosciences, Wuhan 430074, China
4.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
5.
The Engineering & Technology College of Chengdu University of Technology, Leshan 614000, China
6.
Faculty of Mechanical & Electronic Information, China University of Geosciences, Wuhan 430074, China

Received Date: 2014-09-12
Publish Date: 2014-12-01

Abstract

Abstract

On 16 December, 2013, an earthquake of M_s5.1 occurred in the Badong County, the Three Gorges reservoir area, China. Using the EIGEN-6C2 model, the satellite 8-638 order gravity anomalies in this area were studied. The results show that there is a regional low gravity anomaly beneath Badong area at 10 km, which may imply that rock density this area of is lower than its surroundings. Meanwhile, the profiles of crustal velocity structure of this area indicate the existence of two low-velocity layers at depth of 5-9 km and 10-15 km respectively. We believe that the upper layer is closely related to the reservoir seepage and the lower layer may result from the upwelling of the mantle hydrothermal fluid. The low-density layer and the two low-velocity layers provide an evidence for the existence of a possible ductile layer. The occurrence of Badong earthquake is due to the long-term energy accumulation and abrupt release at the deep crust, thus it is a tectonic earthquake. The low-velocity anomaly in the upper crust caused by reservoir seepage decreased the threshold value of fault activities and the change of water load of this reservoir might trigger the Badong earthquake. By comparing the infrasound with seismic waves, we conclude that the infrasound anomalies recorded by the infrasound monitor array are local infrasound.
- Badong earthquake,
- satellite gravity anomaly,
- deep structural condition,
- reservoir-triggered earthquake,
- infrasound anomaly,
- earthquake

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References(109)

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Seismogenesis of Badong Earthquake (Ms 5.1) in Three Gorges Reservoir Area and Infrasound Anomaly

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Seismogenesis of Badong Earthquake (M_s 5.1) in Three Gorges Reservoir Area and Infrasound Anomaly