2025 SCEC CVM Workshop Report: Multi-Scale Seismic Velocity Models for the San Andreas Fault System in the Western US

Patricia Persaud, Kim Olsen, Arthur Rodgers, Philip Maechling, & Yehuda Ben-Zion

Published May 7, 2025, SCEC Contribution #14196

SCEC hosted a virtual workshop on April 4, 2025 to accelerate the development and improvement of multi-scale seismic velocity models that are essential for accurate ground motion simulations and seismic hazard assessments in California and beyond. While significant progress has been made, challenges remain in integrating new data, improving resolution, merging models, and assessing uncertainties. This workshop focused on planning a coordinated research approach to develop multi-scale P- and S-wave velocity models for the San Andreas fault system in the Western US, targeting seismic wavefield simulations up to 5-10 Hz, a frequency range critical for engineering applications. Participants discussed tomography workflows, strategies for merging high-resolution local models and regional models, integrating diverse geophysical data, and developing robust uncertainty quantification methods. The workshop also addressed the development of essential IT tools for model management and access, ensuring practical implementation of workshop recommendations. Discussions at the workshop will guide the development of the next generation of SCEC CVMs, which will advance our understanding of crustal structures and seismic hazards.

Workshop website: https://www.scec.org/events/2025-SCEC-CVM-Workshop

Citation
Persaud, P., Olsen, K., Rodgers, A., Maechling, P., & Ben-Zion, Y. (2025). 2025 SCEC CVM Workshop Report: Multi-Scale Seismic Velocity Models for the San Andreas Fault System in the Western US. , : Statewide California Earthquake Center. https://www.scec.org/wp-content/uploads/2025/05/2025-SCEC-CVM-Workshop-Report_Final.pdf