Abstract
A landslide of 1000m in width and relative height and 1500m in slope length occurred on the right bank of the Hunza River, northern Pakistan in Jan., 2010. Detritus with a volume of ca 40 million cubic meters dammed up the Hunza River. They mainly consist of boulders in a maximum scale of 10m long with fine sand to silt as matrix. Such fine materials were squeezed up and flew on the mound as mudflow. The mudflow killed 19 peoples in the down stream. They were the only victims due to the landslide disaster. Possibility of sudden burst of the landslide dam is presumably low because of large size component. 3D interpretation of space images of ALOS/PRISM clarified development of scarplets deforming valley slope as pre-cautious signs of a landslide on a gigantic scale. Consequently, such technique should be applied to preparation of avoid mapping for gigantic landslides causing natural damming in the high relief region as Himalayas.
