How InSAR Remote Sensing Technology is Used to Study Ground Deformation
The application of repeat-pass synthetic aperture radar (InSAR) interferometry to characterize the distribution and rate of ground subsidence is of profound significance in identifying and managing the risks associated with ground deformation. Interferometry has the capacity to detect and quantify changes in terrain elevation by comparing phase variances from satellite-based radar technology.
The goal of this presentation is to help participants understand applied InSAR technology by walking through how data are analyzed and interpreted while cross-examining the results from two sites, the McMicken Dam and the Peoria feature. Since 1992, Amec Foster Wheeler has been studying land deformation throughout various parts of Arizona. We have been applying interferometric synthetic aperture radar to monitor specific areas of interest on an annual basis. During these studies, data have shown very little subsidence occurring at the McMicken Dam since 1992, however a relatively small subsidence'bowl' near the dam appears to have been related to the earth fissuring in that area. Comparatively, another proximate 'bowl' called the Peoria subsidence feature, has shown the largest magnitude of subsidence since 1992.