Measuring ground displacements from SAR amplitude images: Application to the Landers Earthquake

摘要: ERS SAR amplitude images are utilized to map ground displacements from a sub-pixel correlation method. It yields two-dimensional displacement field with independent measurements about every 128m in azimuth and 250m range. The accuracy depends on the characteristics of images. For Landers test case, 1-σ uncertainty is 0.8m range 0.4m azimuth. We show that this measurement provides major surface fault ruptures accurate better than 1km information coseismic deformation comparable 92 GPS available. Although less accurate, technique more robust interferometry complementary since interferograms only sensitive