Poster #123, Stress and Deformation Over Time (SDOT)
A decade of geodetic deformation linked to fluid injection at the North Brawley Geothermal Field
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Poster Presentation
2020 SCEC Annual Meeting, Poster #123, SCEC Contribution #10470 VIEW PDF
ion history. We then test whether models of aseismic slip and/or poroelastic deformation can explain this time history using a sparse inversion technique based on the small baseline subset (SBAS) method in InSAR processing. We find evidence for both aseismic slip on known fault structures and other sources of deformation during the last decade, with some of these episodes not previously identified. Anomalous transient signals at several GNSS stations are particularly difficult to reconcile with the InSAR and leveling observations and suggest an unusual source mechanism. We then compare the deformation history with injection and production parameters and seismicity catalogs. This long-term deformation history allows us to probe the geothermal field’s response to both long-term and short-term temporal changes in operational parameters, which has implications for other geothermal operations around the world.
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