Seismic hazard implications of post-seismic deformation and stress transfer from the 2019 Searles Valley California Earthquakes
Abstract
The July 4th M6.4 and July 5th 2019 M7.1 Searles Valley earthquakes offer a unique opportunity to evaluate how a combination of co- and post-seismic deformation observations and numerical modeling may provide insight into seismic hazard evaluations such as potential of earthquake triggering. In this study we processed Interferometric Synthetic Aperture Radar (InSAR) and SAR sub-pixel offset estimates to delineate the surface rupture from these earthquakes and to measure the co-seismic deformation of the rupture and the surrounding region. We use geodetic measurements to monitor surface deformation in nearby fault systems and compare these observations with Coulomb stress transfer from both the M6.4 and M7.1 events, the community's preliminary field mapped rupture, and local geological maps. We integrate these observations into models of Coulomb stress transfer and permanent surface deformation to investigate the dynamics of this rupture sequence relative to past earthquakes of the region, between the two events, and the future potential for seismicity in the region. As additional imagery becomes available, we plan to extend this study to measure post-seismic deformation along the Garlock fault as well as regions of static stress change from nearby large earthquakes. In addition, we seek to explore what these data may reveal about the physics and mechanics behind earthquakes. This publication represents the views of the authors and does not necessarily reflect the views of the California Seismic Safety Commission or the Defense Nuclear Facilities Safety Board.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.S41C..08S
- Keywords:
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- 7299 General or miscellaneous;
- SEISMOLOGY