PRELIMINARY SUBSURFACE GEOLOGIC MODEL OF SOUTH-CENTRAL SAN JOAQUIN VALLEY, CALIFORNIA

Subsurface geologic framework models are a fundamental data product for managing risk to life-safety, public and private infrastructure, and economic welfare. In 2021, the governor and state legislature approved funding for the California Geological Survey (CGS) to develop a multi-benefit three-dimensional (3D) geologic framework mapping pilot project in support of improving the state’s capabilities in sustainable groundwater management, seismic hazard mitigation, mineral resource evaluations, and carbon sequestration. The initial product of this pilot project is presented here as a multilayer, stratigraphic 3D model of select subsurface formations and sequence boundaries within the Fresno and Bakersfield 1°x2° Quadrangles, in south-central San Joaquin Valley, covering 3,600 sq. mi. (9,000 sq. km.). Through collaboration with state partners, CGS developed the scope of work for this pilot project based on project stakeholder needs as well as data availability, density, and quality required for a 3D geological model. The results of this three-year pilot project will be used to develop a methodology for CGS 3D mapping projects applied to long-term strategies and prioritization of future projects across the state. Ongoing and future subsurface models will include more detailed assessments of potential carbon storage reservoirs to facilitate meeting the state’s carbon management goals.