Batal on the interpretation of the colour infrared aerophoto （1: 67000） and site verification

the Qaojia slope is considered as a huge ancient landslide which shows typical landslide features

pushing the Jin Sha River and formed an abnormal curve channel

and is coved with loose soil and debris. Qaojia slope

surrunded with large scale active faults is located in the west wing of an anticline and consists of layers prone to slide. The earthquakes there have for intense and frepuent.Heavy rainfall always concentrate in rain season. The landslide occurred about 100

000 years ago.Now

the whole landslide is already stable

but secondary collapse

landslides

and debrisflowes have been developed near the scarp and on the slide body.