Parallel InSAR Streams for the Community Geodetic Model: Evaluating Statewide Kinematics using Customizable Level-2 ARIA, Standardized Level-3 OPERA DISP-S1 Archives, and Preliminary NISAR Data

Simran S. Sangha, Gareth J. Funning, Marin Govorcin, & David Bekaert

Submitted August 30, 2026, SCEC Contribution #15448, 2026 SCEC Annual Meeting Poster #TBD

Over the past several years, our efforts have focused on expanding and refining InSAR time-series analysis to support the Statewide California Earthquake Center (SCEC) Community Geodetic Model (CGM). Here, we present a high-resolution (90-meter) 2014–2023 statewide surface velocity map derived from Level-2 Advanced Rapid Imaging and Analysis (ARIA) products, and detail how we build upon this foundational workflow to ingest the complementary 2016–2025 production of NASA’s operational OPERA Surface Displacement (DISP-S1) Level-3 archive.

These active product streams serve distinct, complementary niches within the geodetic community. The Level-2 ARIA products grant users full control over time-series inversions and network design, while the Level-3 OPERA DISP-S1 suite provides a standardized, ready-to-use time-series derived from a hybrid Persistent and Distributed Scatterer approach.

Using the Miami INsar Time-series software in Python (MintPy) and weather-model-based tropospheric corrections, our comprehensive ARIA-derived baseline across nine satellite tracks yields millimeter-per-year agreement with independent Global Navigation Satellite System (GNSS) observations. This statewide dataset successfully captures a diverse array of deformation signals, including:
- Broad right-lateral shear gradients associated with the Pacific-North American plate boundary.
- Sharp velocity discontinuities indicating shallow fault creep along the central San Andreas Fault, contrasted with broad elastic strain accumulation on locked segments.
- Extreme anthropogenic subsidence exceeding 10 cm/yr in the San Joaquin Valley.
- Localized infrastructure and hazard dynamics in the Los Angeles Basin, including subsidence at the Wilmington oil field and horizontal creeping of the Portuguese Bend landslide.

By leveraging this established ARIA velocity field as a high-fidelity benchmark, we are assessing and integrating our newly prepared 2016–2025 OPERA DISP-S1 time-series. We have adapted open-source workflows to handle the 30-meter spatial resolution and HDF5 format of the DISP-S1 products. Ultimately, utilizing both customizable Level-2 and standardized Level-3 archives provides reliable, low-latency updates to the CGM. Building upon these prepared analysis frameworks, we will present a preliminary analysis integrating early NASA-ISRO Synthetic Aperture Radar (NISAR) data to demonstrate their cross-mission adaptability.

Key Words
tectonics, insar, open-access

Citation
Sangha, S. S., Funning, G. J., Govorcin, M., & Bekaert, D. (2026, 08). Parallel InSAR Streams for the Community Geodetic Model: Evaluating Statewide Kinematics using Customizable Level-2 ARIA, Standardized Level-3 OPERA DISP-S1 Archives, and Preliminary NISAR Data. Poster Presentation at 2026 SCEC Annual Meeting.

Related Projects & Working Groups
Tectonic Geodesy