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Analysis of the relationship between water level fluctuation and seismicity in the Three Gorges Reservoir(China) 被引量:5
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作者 Lifen Zhang Jinggang Li +3 位作者 Guichun Wei Wulin Liao Qiuliang Wang Chuanfang Xiang 《Geodesy and Geodynamics》 2017年第2期96-102,共7页
The Three Gorges Reservoir is a good site for the further researches on reservoir induced seismicity due to decades' seismic monitoring. After the first water impounding in 2003, seismic activity becomes more frequen... The Three Gorges Reservoir is a good site for the further researches on reservoir induced seismicity due to decades' seismic monitoring. After the first water impounding in 2003, seismic activity becomes more frequent than that before water impoundment. In order to quantitatively study, the relationship between the water level fluctuation and earthquakes in TGR, we introduced statistical methods to attain the goal. First of all, we relocated the earthquakes in TGR region with double difference method and divided the earthquakes into 5 clusters with clustering analysis method. Secondly, to examine the impacts of water level fluctuation in different water filling stages on the seismic activity in the 5 clusters, a series of statistical analyses are applied. Pearson correlation results show that only the 175 m water level fluc- tuation has significantly positive impacts on the seismic activity in clusters I, II, III and V with correlation coefficients of 0.44, 0.38, 0.66 and 0.63. Cross-correlation analysis demonstrates that 0, ], 0 and 0 month time delay separately for the clusters I, II, III and V exists. It illustrated the influences of the water loading and pore pressure diffusion on induced earthquakes. Cointegration tests and impulse response analysis denoted that the 175 m water level only had long term and significant effects just on the seismic events in the intersection region of the Fairy Mount Fault and Nine-brook Fault. One standard deviation shock to 175 m water level increased the seismic activity in cluster V for the first 3 months, and then the negative influence was shown. After 7 months, the negative impulse response becomes stable. The long-term effect of the 175 m water impoundment also proved the important role of pore pressure diffusion in RIS with time. 展开更多
关键词 Three Gorges Reservoir Reservoir-induced seismicity Water level fluctuation Cross correlation Impulse response Pore pressure diffusion
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Analysis of coseismic effect on temperature in the Three Gorges well network 被引量:1
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作者 Zhang Weihua Wang Qiuliang +2 位作者 Li Jinggang Luo Junqiu Guo Xizhi 《Geodesy and Geodynamics》 2015年第1期61-66,共6页
Through the Three Gorges well network, we examine different coseismic changes in water temperature caused by local earthquakes since 2008, and offer a mechanistic explanation.The relations between the coseismic change... Through the Three Gorges well network, we examine different coseismic changes in water temperature caused by local earthquakes since 2008, and offer a mechanistic explanation.The relations between the coseismic changes in water temperature and the parameters of distant and local earthquakes are deduced. 展开更多
关键词 Three Gorges well network Coseismic effect Local earthquake Well water temperature Magnitude Epicenter distance Focal mechanism
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