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Journal Articles Journal of Geophysical Research : Solid Earth Year : 2021

Integrated Sentinel-1 InSAR and GNSS Time-Series Along the San Andreas Fault System

, , (1) ,
1
Xiaohua Xu
  • Function : Author
David T. Sandwell
  • Function : Author
Yehuda Bock
  • Function : Author

Abstract

Measuring crustal strain and seismic moment accumulation, is crucial for understanding the growth and distribution of seismic hazards along major fault systems. Here, we develop a methodology to integrate 4.5 years (2015-2019.5) of Sentinel-1 Interferometric Synthetic Aperture Radar (InSAR) and continuous Global Navigation Satellite System (GNSS) time series to achieve 6 to 12-day sampling of surface displacements at ∼500 m spatial resolution over the entire San Andreas fault system. Numerous interesting deformation signals are identified with this product (video link: https://www.youtube.com/watch?v=SxNLQKmHWpY). We decompose the line-of-sight InSAR displacements into three dimensions by combining the deformation azimuth from a GNSS-derived interseismic fault model. We then construct strain rate maps using a smoothing interpolator with constraints from elasticity. The resulting deformation field reveals a wide array of crustal deformation processes including, on- and off-fault secular and transient tectonic deformation, creep rates on all the major faults, and vertical signals associated with hydrological processes. The strain rate maps show significant off-fault components that were not captured by GNSS-only models. These results are important in assessing the seismic hazard in the region.
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insu-03747292 , version 1 (08-08-2022)

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Xiaohua Xu, David T. Sandwell, Emilie Klein, Yehuda Bock. Integrated Sentinel-1 InSAR and GNSS Time-Series Along the San Andreas Fault System. Journal of Geophysical Research : Solid Earth, 2021, 126, ⟨10.1029/2021JB022579⟩. ⟨insu-03747292⟩
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