STUDY OF SLOW-MOVING LANDSLIDE RECOGNITION BY INSAR IN THE KARAKORAM MOUNTAIN SECTION OF CHINA-PAKISTAN ECONOMIC CORRIDOR

There are lots of slow-moving landslides in Hongza valley of Karakoram Mountain along China-Pakistan Economic Corridor, under the geological setting of active tectonic movement, steep terrain, vertical climate, abundant snow, glacier erosion, et al. This study employs the InSAR technology with characteristics of high accuracy, larger region coverage, and untouch, to observe ground surface deformation. Assisting the optical remote sensing interpretation and field validation, we recognize the slow-moving landslides, and further analyze their deformation feature and distribution, draw the following conclusions.(1) Combination of PS-InSAR and D-InSAR can achieved the velocity scale from mm/yr to dm/yr, which not only overcome the lose coherence of SAR date, but also gain the bigger velocity deformation, demonstrating the InSAR technique with PALSAR data is possible and accurate for the slow-moving landslide observationin this area; (2) Slow-moving landslide trailing edge rupture is clear commonly, the deformation between the end of 2008 and the earlier of 2009 is larger than that of other periods, which may be affected by storm rainfall in the second half year of 2008; (3) the velocities of slow-moving landslides ranger from 10 to 30mmyr-1,while the failed Attabad landslide blocked the Karakoram road in 2010 has the abnormal velocity of 27.8~83.8cmyr-1,which provides evidence for the further study for monitoring and early warming.