Study On The Evolution Law Of Landslide And Seismic Deformation Field Based On Insar Technology

InSAR technology is a new means of ground monitoring,through the form of active remote sensing,the use of ground-based SAR system,airborne or spaceborne SAR system to launch electromagnetic waves to the ground in the form of active remote sensing to obtain relevant information,it has the advantages of all-weather,full-time,active,not subject to climatic conditions and other advantages.Because InSAR technology can quickly and accurately obtain high-resolution ground information,this technique is widely used to extract DEM elevation data and monitor surface deformation.Traditional deformation measurement methods,such as GPS measurement,level measurement and so on,can reach millimeter accuracy,but need to set up monitoring points in the area.If the monitoring area in some very dangerous places,the equipment can not be laid.And other non-contact measurement such as laser scanning,although the terrain requirements are low,but limited by the weather,some can't even be imaged at night.To sum up,InSAR technology will be the only efficient and reliable way to obtain ground information in some difficult areas,especially in areas that cannot be covered by traditional measurement methods,such as geological disaster frequency areas or affected areas.The same seismic deformation field obtained is located in the epicenter area of Jiuzhaigou earthquake,and the general deformation monitoring means can not be realized.In this paper,the response relationship between landslide and deformation field in the study area is studied by using D-InSAR technology and GIS software,and the following conclusions are obtained:?1?There are 5628 landslides in the study area,which were banded along the North West-south east.?2?The lift-rail deformation field is shown as an approximate circular LOS settlement area in the north west direction,and the maximum settlement in the area is 20cm,while the down-rail deformation field shows the opposite situation to the lift rail,and through the comparison of the lift-rail and down-rai deformation field,it is preliminarily inferred that the Jiuzhaigou earthquake is a strike-slip earthquake.?3?The opposite situation is presented in the same position of the lift-rail and down-rail profile,which further indicates that the seismic fault movement form of the earthquake is strike-slip type.F₁ and F₂ are inferred earthquake faults,but this paper is more inclined to F₂for the earthquake fault.According to the NW-SE direction of the deformation field of the lifting track and the deformation amount at the F₁ and F₂ profiles,it can be judged that the southwest side of the F₂ is the active disk,and when the F₂ slides,the crustal changes at the a active disk are the greatest,which coincides with the deformation of the active disk.The deformation fluctuation of F₁,F₂ and its surrounding faults is larger than that of Minjiang and Tazang faults,and the distribution of landslide disasters around them is also more??4?By analyzing the response relationship between landslide and deformation field,it is found that the landslide density is similar to that of deformation field,and the landslide can be identified quickly and efficiently by deformation field information,which provides support for landslide disaster monitoring and prevention in the study area.