A new method for measuring deformation on volcanoes and other natural terrains using InSAR persistent scatterers

Details A new method for measuring deformation on volcanoes and other natural terrains using InSAR persistent scatterers A new method for measuring deformation on volcanoes and other natural terrains using InSAR persistent scatterers

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3123611h&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 23, CiteID L23611

Physics

46

Geodesy And Gravity: Space Geodetic Surveys, Geodesy And Gravity: Instruments And Techniques, Radio Science: Interferometry, Volcanology: Instruments And Techniques

Scientific paper

We present here a new InSAR persistent scatterer (PS) method for analyzing episodic crustal deformation in non-urban environments, with application to volcanic settings. Our method for identifying PS pixels in a series of interferograms is based primarily on phase characteristics and finds low-amplitude pixels with phase stability that are not identified by the existing amplitude-based algorithm. Our method also uses the spatial correlation of the phases rather than a well-defined phase history so that we can observe temporally-variable processes, e.g., volcanic deformation. The algorithm involves removing the residual topographic component of flattened interferogram phase for each PS, then unwrapping the PS phases both spatially and temporally. Our method finds scatterers with stable phase characteristics independent of amplitudes associated with man-made objects, and is applicable to areas where conventional InSAR fails due to complete decorrelation of the majority of scatterers, yet a few stable scatterers are present.

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