SCEC Award Number 21122 View PDF
Proposal Category Collaborative Proposal (Integration and Theory)
Proposal Title Investigation of Systematic Differences between CyberShake Studies 15.12 and 20.X Using Ground Motion Modeling Techniques Relevant to Seismic Hazard
Investigator(s)
Name Organization
Christine Goulet University of Southern California Xiaofeng Meng University of Southern California
Other Participants Scott Callaghan
SCEC Priorities 4b, 4c, 4d SCEC Groups GM, EEII, Seismology
Report Due Date 03/15/2022 Date Report Submitted 03/13/2024
Project Abstract
 We systematically compared CS22.10 and CS15.12 in southern California. We found that the updated rupture generator produces smaller ground motions in CS22.10 than the old rupture generator in CS15.12. The reason is likely more diffused radiation patterns produced by the updated rupture generator. Moreover, the addition of the Ely taper on the shallow layer of 3D velocity model slightly increases the simulated ground motions in CS22.10.
Intellectual Merit This project evaluates the improvement of CyberShake platform, which is one of the most advanced ground motion simulation programs in the world. The continued evolution of CyberShake platform is crucial for more accurate seismic hazard forecast in the state of California.
Broader Impacts More realistic CyberShake simulations will lead to significantly improved PSHA in real-world applications.
Exemplary Figure Figure 2. Direct PSA comparison between CS15.12 and CS22.10