2026 SCEC Community Stress Drop Validation Workshop, Phase II Report

Annemarie S. Baltay, & Rachel E. Abercrombie

Published 2026, SCEC Contribution #15674

The Community Stress Drop Validation Study aims to understand and reduce uncertainties in estimated spectral stress drop and related source parameters, strengthening their use in empirical ground motion models and earthquake source representations in simulations. In Phase I, the community researchers evaluated existing approaches by estimating stress drop for the 2019 Ridgecrest earthquake sequence. Phase II of the study is designed to address problems exposed in Phase I applying evolving methods to synthetic data and a new empirical data set for the San Francisco Bay Area with an additional focus on seismic moments and magnitudes and site amplification and attenuation. The aim of this in-person workshop was to develop the design for the planned synthetic tests and begin analysis of the first synthetic data, together with selection of the optimal Bay Area empirical dataset. The format will be primarily discussion based.

Citation
Baltay, A. S., & Abercrombie, R. E. (2026). 2026 SCEC Community Stress Drop Validation Workshop, Phase II Report. , : Statewide California Earthquake Center. https://www.scec.org/events/2026-community-stress-drop-validation-workshop-phase-ii/