Group A, Poster #181, Ground Motions (GM)
Apparent geometric decay in near field for a 1D layered earth
Poster Image:
Poster Presentation
2024 SCEC Annual Meeting, Poster #181, SCEC Contribution #14013 VIEW PDF
such a steep geometric decay and evaluate how well the conventional assumption—that S-waves dominate near-field observations—holds. To simulate conditions of ground motion prediction and stress drop estimation, we consider a series of Mw 4-5 point sources with varying focal mechanisms, source depths, and Brune’s time functions, located beneath the center of a circular area. For each point source, we calculate 3-component 1D synthetic seismograms at a set of uniformly distributed stations within this circle. We then estimate the Fourier spectral amplitudes, ranging from 0.2 Hz to 25 Hz, and regress their expected amplitude decay rates with distance and corresponding uncertainties.
SHOW MORE
SHOW MORE