Abstract: Earthquakes induced by reservoirs always cause more serious damage to reservoir dam due to its epicenter location and destroying effect.Reservoir induced earthquakes have different characteristics from the natural ones,their hypocenters are always shallow,less than ten kilometers,and the magnitude is small too.Till now the biggest earthquake induced by reservoir is the MS6.1 earthquake in Xinfengjiang reservoir in 1962.The paper analyzes the effects of different factors related to reservoir induced earthquake based on GIS technology and lots of reservoir induced earthquakes data from the world.The primary results show that reservoir's local geological and hydrogeological settings have closer relations with induced earthquake than regional geological and seismic activity setting does.The reservoirs with dams higher than 50m or reservoir volume greater than 5?1010 m3 are prone to induced earthquake.Moreover,the reservoir region,where limestone,carbonatite,karst landform,or joints and high permeable structure are developed,will have a higher probability to induce earthquake.

Key words: reservoir induced earthquake, GIS technology, seismic peak ground acceleration

摘要： 水库地震由于其发生位置和破坏作用的特殊性,已引起各国对该问题研究的重视。水库地震不同于一般天然地震,具有震源浅,震级低的特点,目前已知的最大水库地震震级为1967年印度柯依那水库6.5级地震。在广泛收集国内外水库地震资料的基础上,分析了区域地震活动背景对水库诱发地震的影响,并对水库坝高、库容、库区岩性等因素与诱发地震之间的关系进行了统计分析。初步的研究结果认为:库区的地质构造和水文地质条件对水库地震的影响大于区域断裂背景及区域地震活动背景的影响,水库规模与诱发地震之间具有一定关系,坝高>50m,库容超过50亿m3的水库诱发地震的概率较大;同时,处于灰岩、碳酸岩、岩溶发育地区的水库诱发地震的概率要大,构造复杂、节理发育等造成渗透条件好的库区也易诱发地震。

关键词: 水库地震, GIS分析, 地震动峰值加速度