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Finite element investigation of the poroelastic effect on the Xinfengjiang Reservoir-triggered earthquake
作者: Cheng Huihong; Zhang Huai; Zhu BJ(朱伯靖); Sun Yujun; Zheng Liang; Yang Shaohua; Shi Yaolin
刊名: Science China Earth Sciences
出版日期: 2012-12
卷号: 55, 期号:12, 页码:1942-1952
DOI: 10.1007/s11430-012-4470-8
学科分类: 地球科学::固体地球物理学
收录类别: SCI
通讯作者: Shi Yaolin, Email: shiyl@gucas.ac.cn
关键词: Xinfengjiang Reservoir ; reservoir triggered seismicity ; Coulomb failure stress ; poroelasticity model ; finite element method
英文摘要: 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.
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)
语种: 英语
原文出处: 查看原文
ISSN号: 1674-7313
文章类型: Article
研究领域[WOS]: Geology
类目[WOS]: Geosciences, Multidisciplinary
关键词[WOS]: INDUCED SEISMICITY ; WENCHUAN EARTHQUAKE ; ZIPINGPU RESERVOIR ; PORE PRESSURE ; IMPOUNDMENT ; DIFFUSION
WOS记录号: WOS:000312346200002
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/12320
Appears in Collections:非本单位_期刊论文

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Recommended Citation:
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.
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文件名: Finite element investigation of the poroelastic effect on the Xinfengjiang Reservoir-triggered earthquake.pdf
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