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Interferometric synthetic aperture radar (InSAR) has become an important geodetic tool for measuring deformation of Earth's surface due to various geophysical phenomena, including slip on earthquake faults, subsurface migration of magma, slow‐moving landslides, movement of shallow crustal fluids (e.g., water and oil), and glacier flow. Airborne and spaceborne synthetic aperture radar (SAR) instruments transmit microwaves toward Earth's surface and detect the returning reflected waves. The phase of the returned wave depends on the distance between the satellite and the surface, but it is also altered by atmospheric and other effects. InSAR provides measurements of surface deformation by combining amplitude and phase information from two SAR images of the same location taken at different times to create an interferogram. Several existing open‐source analysis tools Rosen et al ., 2004; Rosen et al ., 2011; Kampes et al ., 2003; Sandwell et al ., 2011 enable scientists to exploit observations from radar satellites acquired at two different epochs to produce a surface displacement map.
Agram et al. (Tue,) studied this question.