云南南部有一条令人注目的南北向断陷湖盆带。作者在1979年底调查了其中最南部的记麓湖,发现它在全新世期间发生过剧烈的变迁,而且反映了1970年通海7.7级地震震区的新构造运动特点。杞麓湖形成于通海断陷盆地中(照片1),现今最大水深据通海县水利局实测为4.3米。盆地四周受断裂控制(图1)。据云南省基建工程兵进行的水文地质与物探勘测,盆地内基底最深处在 Southern Yunnan has an impressive north-south fault zone. At the end of 1979, the authors surveyed Kelulu Lake, the southernmost part of China, and found that it had undergone drastic changes during the Holocene. It also reflected the neotectonic characteristics of the 1970 earthquake with a 7.7-magnitude Tonghai earthquake. Qilu Lake formed in the Tonghai rift basin (photo 1), the current maximum water depth according to Tonghai County Water Conservancy Bureau measured 4.3 meters. Controlled by faults around the basin (Figure 1). According to the hydrogeology and geophysical survey carried out by the infrastructure corps in Yunnan Province, the deepest basement in the basin is