Journal de télédétection et SIG

Abstrait

Monitor and Study Horizontal and Verticals Changes at Land Surfacein Wen Chuan Area from 1974 to 2010 Using Remote Sensing and GISTechnology

Mohamed Mhmod, Liu Cai and Meng Zhuoguo

Wenchuan area has been one of the seismically active regions. The occurrences of earthquakes are largely controlled by active faults .The results showed that in Wenchuan area, movements of plate tectonic were not in the same direction in recent 40 years and when there was a change in the direction of plate tectonics there was an earthquake in Sichuan, or on Tibet plate, but most of the earthquakes were in the region between plate Sichuan and Tibet plate. The idea is to compare between images from the same satellite for same area in different years by using remote sensing and GIS technology. The result will become better if there are images of the same area every year. The satellite images were used from 1974-1976 land sat-1,2 ,1989-1996 land sat-4,1999-2005 land sat -7, Google earth images 2005-2008 after and before the earthquake Wenchuan 2008, Geomorphic features are extracted from the Shuttle Radar Topography Mission (SRTM) DEM data 2002 and 2010, SRTM DEM and Land sat data were used to extract the geo morphometric Features and structures. The relationship between the topography and tectonics is assessed to understand the evolution mode.