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Finite element investigation of the poroelastic effect on the Xinfengjiang Reservoir-triggered earthquake
Cheng Huihong1,2; Zhang Huai1,2; Zhu BJ(朱伯靖)1,2; Sun Yujun1,2,4; Zheng Liang1,2; Yang Shaohua1,2; Shi Yaolin1,2,3
Source PublicationScience China Earth Sciences
2012-12
Volume55Issue:12Pages:1942-1952
DOI10.1007/s11430-012-4470-8
Indexed BySCI
KeywordXinfengjiang Reservoir Reservoir Triggered Seismicity Coulomb Failure Stress Poroelasticity Model Finite Element Method
Abstract

Coulomb failure stress changes (Delta CFS) are used in the study of reservoir-induced seismicity (RIS) generation. The threshold value of Delta CFS that can trigger earthquakes is an important issue that deserves thorough research. The M (s)6.1 earthquake in the Xinfengjiang Reservoir in 1962 is well acknowledged as the largest reservoir-induced earthquake in China. Therefore, it is a logical site for quantitative calculation of Delta CFS induced by the filling of the reservoir and for investigating the magnitude of Delta CFS that can trigger reservoir seismic activities. To better understand the RIS mechanism, a three-dimensional poroelastic finite element model of the Xinfengjiang Reservoir is proposed here, taking into consideration of the precise topography and dynamic water level. We calculate the instant changes of stress and pore pressure induced by water load, and the time variation of effective stresses due to pore water diffusion. The Delta CFS on the seismogenesis faults and the accumulation of strain energy in the reservoir region are also calculated. Primary results suggest that the reservoir impoundment increases both pore pressure and Delta CFS on the fault at the focal depth. The diffusion of pore pressure was likely the main factor that triggered the main earthquake, whereas the elastic stress owing to water load was relatively small. The magnitude of Delta CFS on seismogenesis fault can reach approximately 10 kPa, and the Delta CFS values at the hypocenter can be about 0.7-3.0 kPa, depending on the fault diffusion coefficient. The calculated maximum vertical subsidence caused by the water load in the Xinfengjiang Reservoir is 17.5 mm, which is in good agreement with the observed value of 15 mm. The accumulated strain energy owing to water load was only about 7.3x10(11) J, even less than 1% of the seismic wave energy released by the earthquake. The reservoir impoundment was the only factor that triggered the earthquake.

Funding ProjectKey Laboratory of Earthquake Dynamics ; Ministry of Land and Resources ; National Basic Research Program of China[2008CB425701] ; National High-tech R&D Program of China[2010AA012402]
Funding OrganizationKey Laboratory of Earthquake Dynamics ; Ministry of Land and Resources ; National Basic Research Program of China[2008CB425701] ; National High-tech R&D Program of China[2010AA012402]
Language英语
Subject Area固体地球物理学
MOST Discipline Catalogue理学 ; 理学::地球物理学
SubtypeArticle
PublisherSCIENCE PRESS
Publication Place16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
ISSN1674-7313
URL查看原文
WOS IDWOS:000312346200002
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS KeywordINDUCED SEISMICITY ; WENCHUAN EARTHQUAKE ; ZIPINGPU RESERVOIR ; PORE PRESSURE ; IMPOUNDMENT ; DIFFUSION
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12320
Collection个人在本单位外知识产出
Corresponding AuthorShi Yaolin
Affiliation1.Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049, China
2.College of Earth Science, Graduate University of Chinese Academy of Sciences, Beijing 100049, China
3.State Key Laboratory of Earthquake Dynamics, Beijing 100029, China
4.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
Recommended Citation
GB/T 7714
Cheng Huihong,Zhang Huai,Zhu BJ,et al. Finite element investigation of the poroelastic effect on the Xinfengjiang Reservoir-triggered earthquake[J]. Science China Earth Sciences,2012,55(12):1942-1952.
APA Cheng Huihong.,Zhang Huai.,Zhu BJ.,Sun Yujun.,Zheng Liang.,...&Shi Yaolin.(2012).Finite element investigation of the poroelastic effect on the Xinfengjiang Reservoir-triggered earthquake.Science China Earth Sciences,55(12),1942-1952.
MLA Cheng Huihong,et al."Finite element investigation of the poroelastic effect on the Xinfengjiang Reservoir-triggered earthquake".Science China Earth Sciences 55.12(2012):1942-1952.
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