A statewide InSAR velocity map for California produced by a comprehensive large scale analysis of ARIA standard products
Simran S. Sangha, Gareth J. Funning, Marin Govorcin, & David BekaertIn Preparation January 21, 2026, SCEC Contribution #15010
Routine wide-swath SAR acquisitions with the current generation of satellite missions is enabling the possibility for routine monitoring of fault behavior over wide continental regions, including interseismic strain accumulation on faults, and shallow fault creep. The Southern California Earthquake Center (SCEC) Community Geodetic Model project is an attempt to produce a consensus set of processed Interferometric Synthetic Aperture Radar (InSAR) and Global navigation satellite system (GNSS) data that can be used by the scientific community for the purposes of constraining seismic hazard and tectonic behavior. We contribute to this effort using InSAR data from the Sentinel-1 satellites, processed routinely using a cloud-based system by, the Caltech-JPL Advanced Rapid Imaging and Analysis (ARIA) Center for Natural Hazards project (https://aria.jpl.nasa.gov/). The full archive of standardized Geocoded UNWrapped (GUNW) interferograms from 9 Sentinel-1 tracks that cover the entire state of California, is used to produce surface deformation velocity maps at a statewide scale. We validate these maps against GNSS velocity data, test the effectiveness of weather model-based troposphere corrections, and show some examples of deformation features apparent in the data, including subsidence of the San Joaquin Valley and shallow creep on the central San Andreas fault.
Citation
Sangha, S. S., Funning, G. J., Govorcin, M., & Bekaert, D. (2026). A statewide InSAR velocity map for California produced by a comprehensive large scale analysis of ARIA standard products. Scientific Reports, (in preparation).
Related Projects & Working Groups
Community Geodetic Model (CGM), Community Earth Models (CEM), Tectonic Geodesy, Research Computing (RC)
