一、引 言 近年来在国内外有不少水库在建成蓄水后即发生地震,这种现象人们称为水库诱发地震。业已引起世界各国有关部门的关注。 汉江丹江水库为国内已建成的大型水库之一,自1967年建成蓄水后也陆续发生过这种现象。1973年11月29日在距大坝40余公里的宋湾发生了M_s=4.8级的地震,1977年8月6日在丹江坝址附近又发生了一次M_s=3.8级的地震。对于大坝及高耸的闸墩结构的安全问题,有关部门表示了极大的关注。 I. INTRODUCTION In recent years, many reservoirs in China and abroad have experienced earthquakes after the completion of their water storage. This phenomenon is called reservoir induced earthquake. Has drawn the attention of relevant departments of all countries in the world. Hanjiang Danjiang Reservoir is one of the large-scale reservoirs built in China. This phenomenon has also occurred successively after the impoundment was completed in 1967. On November 29, 1973, an M_s = 4.8 earthquake occurred in Songwan about 40 kilometers away from the dam. On August 6, 1977, another M_s = 3.8 earthquake occurred near Danjiang dam site. Concerning the safety of dams and towering pier structures, relevant departments expressed great concern.