Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Volume 120, Issue 8, Pages 5952-5963Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015JB011886
Keywords
InSAR; time series; atmospheric delays; transient deformation
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Funding
- NASA [NNX14AQ15G]
- Southern California Earthquake Center
- NASA [NNX14AQ15G, 674657] Funding Source: Federal RePORTER
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We present a method for estimating radar phase delays due to propagation through the troposphere and the ionosphere based on the averaging of redundant interferograms that share a common scene. Estimated atmospheric contributions can then be subtracted from the radar interferograms to improve measurements of surface deformation. Inversions using synthetic data demonstrate that this procedure can considerably reduce scatter in the time series of the line-of-sight displacements. We demonstrate the feasibility of this method by comparing the interferometric synthetic aperture radar (InSAR) time series derived from ERS-1/2 and Envisat data to continuous Global Positioning System data from eastern California. We also present results from several sites in the eastern California shear zone where anomalous deformation has been reported by previous studies, including the Blackwater fault, the Hunter Mountain fault, and the Coso geothermal plant.
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