The Creeping Landslide Characteristics Research Based On SBAS-InSAR Method In Xianshuihe Fault Zone

Xianshuihe Fault zone complex geological structure,neotectonic movement is strong,and structure of fault zone rock mass within the broken,giant landslide is very largedevelopment,serious hazard.Due to visible light and near infrared remote sensing are greatly influenced by the weather and the DEM accuracy problems,such as the stress and strain measurement,earthquake monitoring,close shot photogrammetry is more effective in the international landslide monitoring technology is unable to provide accurate information and provide only relatively macroscopic qualitative and semi-quantitative monitoring results.Synthetic aperture radar interferometry technique because of its day,all-weather,to reach the personnel to enter the area,on the ground deformation monitoring precision can reach millimeter,landslide recognition in recent years and has been widely applied in deformation monitoring.Therefore,this article USES the Japanese earth observation satellite(ALOS),PalSAR data acquired with fresh water river fracture of geological hazard effect as the main content,application of time series of InSAR technology SBAS-InSAR(Small Baseline Subset,InSAR)to identify type creep landslide and slow deformation monitoring,the fresh water river fault zone to furnace huo daofu section of town along the surface creep characteristics to carry out the displacement analysis,stability of the landslide boundary identification and discriminant analysis,has made the following points:(1)based on the analysis of the pixel rate from the 6 fracture section of Xianshuihe Fault,The Xianshuihe Fault zone in the confidence level of 95% between 2007 and 2011,the relative deformation rate of both sides is about 9.40±0.78mm/yr.(2)Overall,We use InSAR technique monitoring the surface deformation between 2007-2011 of the Xianshuihe Fault zone: identify the number of development the creeping landslide total 108 of The Xianshuihe Fault zone from Daofu to Luhuo,and the number of West northern more than the south eastern,combined with InSAR analysis,remote sensing images and field site investigation,it has a Closely related to the Seismic activity frequency is high and the large strike-slip rate.(3)The identified landsldes is development servely in fracture interchange,This is consistent with the field investigation of the fractured rock mass is serious in fracture interchange,the diversification of the stress direction,the intersection relations more complex;The occurrence of landslides has a lot to the distance from the Xianshuihe Fault zone.The 80% of the identified landsldes happened in fault trace line in 3km range,The scope adapted to the surface damage field measurements of the Xianshuihe Fault fracture damage zone and the theory predicts.(4)Locally,We choose four typical landslides on both sides of the Xianshuihe Fault zone,analysis the speed and displacement analysis of the variation law of time and space.For an individual landslide,The leading edge and trailing edge because of Small collapse,human activities,fluvial erosion and so on,Show thedifference of sliding velocity.The creep location of the creepping landslide,Mainly distributed in both sides of the fracture,Where the river erosion,broken rock mass is really developed servely.