【摘要】 据统计调查,从公元前26年至今的2千余年里,四川省至少有9次地震事件形成过堰塞湖。本文简述了这9次地震堰塞湖及其灾害情况,并在此基础上分析总结出地震堰塞湖形成的充分条件为:所在地区地震烈度大于等于Ⅷ度,且堰塞湖的数量和规模与烈度值呈正相关关系;地形为高山峡谷江(河)段,两岸或一侧为高陡的岩壁或台地前缘;岩性条件为江(河)两岸或一侧存在较破碎的基岩或巨厚的松散堆积体。在满足上述充分条件下,若恰遇雨季或震后连降暴雨,则形成地震堰塞湖的可能性剧增,溃坝产生次生水灾的危险性也随之增大。更多还原

【Abstract】 9 strong earthquakes have caused the quake lakes in Sichuan region since 26 BC.These quake lakes and its hazards are described.The sufficient condition of forming a quake lake is listed as following.First the seismic intensity is greater than Ⅷ degree and the higher the seismic intensity is and the more quake lakes are formed.Second the topography where a quake lake forms is the areas with high-mountain or deep gorge and,in other words,with the steep sloping sides or frontal bounder.Third the lithology condition is broken deposit of bedrock.If a strong earthquake occurs in this area where three conditions are satisfied as mentioned above,a quake lake will be formed after a heavy rainfall.The dam break will cause a heavy flood or a hazard.更多还原