On May 29, 1976 (at Beijing time 20h23m and 20hOOm) two strong earthquakes of magnitude 7.5 and 7.6 respectively occurred in Longling of Yunnan province, with intensity Ⅸ in the epicentral area. The eastern part of Longling district has severely been damaged, causing rock-falls, land collapse, landslides, debris flows and ground fissures in a large scale. Investigations of earthquake disaster and intensity in the earthquake region show that several points with higher intensity occur mostly in a Quaternary subsidence basin. Here the iso-intensity line agrees very well with the shape of the basin, reflecting the apparent influence of regional geological and geomorphological background. In general, buildings collapsed more in the Quaternary basin than in the mountainous areas with bed rock. And, for the intermontane basins the degree of collapsing of houses in woodframework increases with the decreasing compaction of the ground and increasing thickness of strata.The damage caused by earthquake seems to be more severe in convex narrow strips of land and steeper slopes than in concave open and lowlying relief.
. 1978, 龙陵地震震害与地质. 地质科学, 13(3): 275-282.
. THE GEOLOGY OF EARTHQUAKE DISASTER CAUSED BY LONGLING EARTHQUAKE[J]. Chinese Journal of Geology, 1978, 13(3): 275-282.