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Analysis of the InSAR Earthquake Deformation Field in Damxung Based on GIS

YANG Zhen;ZHANG Yong-zhi;JIAO Jia-shuang;ZHANG Wen-jun;HUAI Yan-ke;School of Geology Engineering and Geomatics,Chang'an University;Map Institute,Gansu Administration of Surveying and Mapping Geoinformation;  
InSAR technology can achieve centimeter-level accuracy in terms of coseismic deformation measurement but presents disadvantages of complex data post-processing and consequent explanation.The results of GIS spatial analysis are extremely rich,and its data management function is fairly powerful.This paper's main objective is to use GIS technology to analyze the results of InSAR data,strengthen results management,and improve the preciseness of analytical results to enable a diverse display of the consequent data.A M W6.3earthquake that occurred at 16:30on October 6,2008 in Damxung County in the Tibet Autonomous Region is taken as an example.Using ENVISAT ASAR level 0and SRTM DEM data groups,the coseismic deformation field of the earthquake was obtained via two-pass differential interferometry with the InSAR method.The basic geographic data of the study area,including river,boundary line,and road and boundary conditions,were collected.GIS data analysis capabilities were adopted to explain the seismic deformation field extracted by InSAR data.Using the GIS management function,effective management was first conducted on the multi-source data,after which the epicenter position of the earthquake was confirmed.Then,the maximum deformation quantity at the settlement area wasobtained,and the main deformation zone was determined.Finally,using the GIS multiple display function,the deformation results were displayed in the form of statistical tables and sectional and three-dimensional drawings.The deficiencies of the InSAR data were related data post-processing,data explanation,and presentation achievement.Analysis of the InSAR results using GIS effectively compensated for the deficiencies of InSAR.GIS is suitable for extracting information on InSAR deformation fields and can effectively ensure the preciseness of the obtained results,thereby improving research findings in this field.
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