Impact of the Reservoir Induced Seismicity on Three Gorges Project

Abstract eng:
As the world's famous and grand water project, Three Gorges Reservoir has the most comprehensive means in monitoring network, including digital remote sensing seismic network, crustal deformation monitoring network and groundwater observation wells net. Many years of continuous monitoring provide us precious data materials, which lay a solid foundation to study the reservoir induced seismicity in Three Gorges area. The existing monitoring data show that the number and frequency of earthquakes after water impoundment increase continuously, that is, water storage indeed induce some earthquakes, but the strength and location are basically same with past’s. According to the deformation monitoring and gravity field analysis, the biggest vertical deformation area and gravity change area are still in Xiangxi after water impoundment. Based on those monitoring results, we predict that earthquakes below a magnitude of 4.5 will occur after the third water impoundment(elevation of 175m),however, the intensity will not exceed Ⅵ.

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