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Measuring ground displacements from SAR amplitude images: Application to the Landers Earthquake
Author(s) -
Michel Rémi,
Avouac JeanPhilippe,
Taboury Jean
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900138
Subject(s) - azimuth , geology , geodesy , amplitude , displacement (psychology) , interferometry , remote sensing , range (aeronautics) , interferometric synthetic aperture radar , deformation (meteorology) , global positioning system , orientation (vector space) , pixel , seismology , synthetic aperture radar , optics , computer science , geometry , physics , psychology , telecommunications , oceanography , materials science , mathematics , composite material , psychotherapist
ERS SAR amplitude images are utilized to map ground displacements from a sub‐pixel correlation method. It yields a ground two‐dimensional displacement field with independent measurements about every 128m in azimuth and 250m in range. The accuracy depends on the characteristics of the images. For the Landers test case, the 1‐σ uncertainty is 0.8m in range and 0.4m in azimuth. We show that this measurement provides a map of major surface fault ruptures accurate to better than 1km and information on coseismic deformation comparable to the 92 GPS measurements available. Although less accurate, this technique is more robust than SAR interferometry and provides complementary information since interferograms are only sensitive to the displacement in range.