【摘要】 <正> 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更多还原

【Abstract】 The Qilu Lake is located in the Tunghai down-faulted lake basin in the 1970Tunghai earthquake area in southern Yunnan. A series of ancient lake strandlinesoccurring as shell layers and beach ridges were discovered on both the northernand the southern shores, of which 2 are on the northern shore and 4 on thesouthern one. The strandlines of the same age are higher in elevation on thesouthern shore than those on the northern one. This fact revails that the watermight have migrated and retreated northeastwards to the present lake basin. Mostprobally caused by differential uplifting and northward tilting fault blocks in thearea. It is believed to represent the result of the holocene activity of the seismo-genetic fault of the Tunghai earthquake, a NW-trending dextral and pivotal Quji-ang fault located south of the lake basin; to be more exact. it revails the resultof the upthrusting of the northeastern hanging wall against the southwestern foot-wall along the NE-dipping fault plane on the southeastern stretch of the fault. The uppermost and oldest shoreline on the southern margin of the lake basinis 83m above lake level and has a C¹⁴ age of 12756 years. From this it is knownthat this area has an average uplifting rate of 0.65 cm/yr and is structurally anarea of intense uplifting.更多还原