Contribution to the Community Geodetic Model: Line-of-Sight Deformation Time-series along the San Andreas Fault System from Sentinel-1 InSAR and GPS

David T. Sandwell, Xiaohua Xu, Emilie Klein, Peng Fang, & Yehuda Bock

Published August 15, 2019, SCEC Contribution #9714, 2019 SCEC Annual Meeting Poster #321

We present a crustal deformation time-series along the San Andreas Fault System by combining measurements from Sentinel-1 Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS) data. We assembled 9 tracks of Sentinel-1 InSAR data spanning 2014.11-2018.12, and produced 3758 interferograms, each of which covers roughly 250km x 420km area (~60 bursts) (5 descending tracks shown below, 4 ascending tracks available on-line). These interferograms are unwrapped using SNAPHU [Chen & Zebker, 2002], and then corrected with GPS solutions provided by Scripps Orbit and Permanent Array Center (SOPAC) [Klein et al., 2019]. We used coherence-based small baseline subset (SBAS) method [Tong & Schmidt, 2016] together with atmospheric correction by common-scene stacking (CSS) [Tymofyeyeva and Fialko, 2015] to construct deformation time series [Xu et. al., 2017]. By applying these approaches, one can acquire accurate line-of-sight deformation time-series that are precise in both large and small spatial scales. This product is now available on https://topex.ucsd.edu/gmtsar/insargen/ [Xu and Sandwell, in prep] and will be part of the SCEC community geodetic model. We further analyzed the moment accumulation rate by performing inversion on each fault segment and compared the results with earthquake cycle models.

Key Words
Community Geodetic Model, InSAR, GPS

Citation
Sandwell, D. T., Xu, X., Klein, E., Fang, P., & Bock, Y. (2019, 08). Contribution to the Community Geodetic Model: Line-of-Sight Deformation Time-series along the San Andreas Fault System from Sentinel-1 InSAR and GPS. Poster Presentation at 2019 SCEC Annual Meeting.

Related Projects & Working Groups
SCEC Community Models (CXM)