Region-Specific Fourier-Based Site Amplification Modeling

Jeff Bayless, Andreas Skarlatoudis, & Jonathan P. Stewart

Published August 1, 2019, SCEC Contribution #9322, 2019 SCEC Annual Meeting Poster #024

There is increasing recognition that simulations can be utilized in engineering applications, but for the simulations to be accepted, they need to be validated first. To facilitate future validations, we develop a Fourier-based site amplification model regionalized for Southern California using an expanded database. We perform a residual analysis to infer site response in Southern California from earthquake recordings, and develop frequency-dependent amplification of Fourier amplitude ordinates as a function of site parameters Vs30, depth, and identified basin structures (LA, San Fernando, etc.). The product is a Southern California region-specific nonlinear amplification model for the horizontal component of Fourier amplitude spectra (FAS). This model serves as an improvement to the existing response spectra-based model used frequently on the SCEC BBP, and as an epistemic alternative to the existing nonlinear models developed through ground response simulations.

Key Words
Site Amplification, Ground Motion Model

Citation
Bayless, J., Skarlatoudis, A., & Stewart, J. P. (2019, 08). Region-Specific Fourier-Based Site Amplification Modeling. Poster Presentation at 2019 SCEC Annual Meeting.

Related Projects & Working Groups
Ground Motions