云鹏电站水库诱发地震浅析

Preliminary Analysis on the Earthquake Induction of the Reservoir of Yunpeng Hydropower Station

云鹏电站水库区内分布有三迭系中统个旧组灰岩，部分库段灰岩与库水直接接触，水库库容3．74×10^8m^3，为大（2）型水库，云鹏电站水库具有发生水库诱发地震的地震地质条件。本文对水库蓄水后2007年3月至2008年1月间水库区发生的一系列地震，就其与库水位关系进行分析研究，结合工程区区域地质背景、水库地质条件以及工程规模等，类比国内岩溶地区水库诱发地震震例，判断该系列地震群属岩溶塌陷型水库诱发地震。

T2gC distributes at the reservoir of Ytmpeng Hydropower Station, and that at some sections of the reservoir even contacts directly with the reservoir＇s water. With a storage capacity of 3.74×10^8m^3, it is a large （II） reservoir. The hydropower station has the seismic geological condition which may induce earthquakes due to the reservoir. This paper analyzes and studies the relation between a series earthquakes happening from March 2007 after the reservoir filling to January 2008 and the reservoir＇s water level. Considering the project area＇s regional geological background, the reservoir＇s geological conditions and the project＇s scale, this paper compares the project with some domestic cases in which the reservoirs built in karst regions induced earthquakes and draws the conclusion that the said series earthquakes were karst collapsing reservoir-induced earthquakes.