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Landers earthquake coseismic displacements in southern California estimated by interferometric SAR and continuous GPS (plotted at the same scale). Continuous GPS measurements can estimate absolute coseismic displacements with mm-level precision but cannot compete with the spatial coverage provided by INSAR. However, CGPS can be very useful in constraining the phase-differences at the GPS sites in the SAR interferograms. One cycle of color corresponds to 28 mm of change in the range.

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