Induced seismicity at wujiangdu reservoir, China: a case induced in the karst area
To date 19 cases of reservoir-induced seismicity have been acknowledged in China and 15 of them are associated with karst. The Wujiangdu case is a typical one induced in the karst area. The dam with a height of 165 m is the highest built in a karst area in China. Seismic activity has been successively induced in five reservoir segments seven months after the impoundment in 1979. A temporary seismic network consisting of 8 stations was set up in one of the segments some 40 km upstream from the dam. The results indicate that epicenters were distributed along the immediate banks, composed of karstified carbonate, and focal depths were only several hundred meters. Most of the focal mechanisms were of thrust and normal faulting. It is suggested that karst may be an important factor in inducing seismicity. It can provide an hydraulic connection to change the saturation and pressure and also weak planes for dislocation to induce seismicity.
Key wordsReservoir-induced seismicity karst Wujiangdu Reservoir of China
Unable to display preview. Download preview PDF.
- Gupta, H. K., andRastogi, B. K.,Dams and Earthquakes (Elsevier, 1976).Google Scholar
- Hu Yuliang, andChen Xiancheng (1979),Discussion on the Reservoir-induced Earthquakes in China and Some Problems Related to their Origin, Seismology and Geology1 (4), 45–57.Google Scholar
- Hu Yuliang, Chen Xiancheng, Zhang Zonglian, Ma Wento, Liu Zuyuang, andLei Iun (1976),Induced Seismicity at Hunanzhen Reservoir, Zhejiang Province, Seismology and Geology8 (4), 1–25.Google Scholar
- Hu Yuliang (1988),Induced Seismicity and Countermeasure, Earthquake Research in China4 (4), 34–39.Google Scholar
- Wang Miaoyueh, Yang Maoyuan, Hu Yuliang et al. (1976),Mechanism of the Reservoir Impounding Earthquakes at Hsinfengkiang (Xingfengjiang) and a Preliminary Endeavor to Discuss their Cause, Engineering Geology10 (2–4), 331–351.Google Scholar