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Finite element investigation of the poroelastic effect on the Xinfengjiang Reservoir-triggered earthquake
Cheng Huihong; Zhang Huai; Zhu BJ(朱伯靖); Sun Yujun; Zheng Liang; Yang Shaohua; Shi Yaolin; Shi Yaolin, Email: shiyl@gucas.ac.cn
2012-12
发表期刊Science China Earth Sciences
ISSN1674-7313
卷号55期号:12页码:1942-1952
摘要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.
关键词Xinfengjiang Reservoir Reservoir Triggered Seismicity Coulomb Failure Stress Poroelasticity Model Finite Element Method
学科领域固体地球物理学
DOI10.1007/s11430-012-4470-8
项目资助者Key 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)
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收录类别SCI
语种英语
文章类型Article
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000312346200002
关键词[WOS]INDUCED SEISMICITY ; WENCHUAN EARTHQUAKE ; ZIPINGPU RESERVOIR ; PORE PRESSURE ; IMPOUNDMENT ; DIFFUSION
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被引频次:8[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12320
专题非本单位
通讯作者Shi Yaolin, Email: shiyl@gucas.ac.cn
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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, Email: shiyl@gucas.ac.cn.(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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