Kim Olsen and Rumi Takedatsu
Department of Geological Sciences, San Diego State University

SCEC Broadband Platform (BBP) Phase I Ground Motion Simulation Results: SDSU Module

SCEC Broadband Platform (BBP) Validation Exercise

SCEC has completed phase 1 of its BBP ground motion simulation results, evaluating the potential application for engineering of the resulting PSAs generated by 5 different methods. The evaluation included Part A, where the methods were evaluated based on the bias of simulation results to observations for 7 well-recorded historical earthquakes with station distances between 1 and 193 km, and Part B, where simulation results for Mw6.2 and Mw6.6 strike-slip and reverse-slip scenarios were evaluated at 20 km and 50 km from the fault. The methods were assessed based on the bias of the median PSA for the 7 events in Part A, and on a specified acceptance criterion compared to NGA-West2 GMPEs in Part B.

One of the 5 methods was the hybrid method BBtoolbox version 1.4, combining low-frequency (LF) deterministic synthetics with high-frequency (HF) scattering functions, convolved with an appropriate source-time function (Mai et al., 2010; Mena et al., 2010). In the validation exercise, the LFs are generated using GFs and the kinematic source generator module by Graves and Pitarka (2010, ‘GP’), identical to those used by the GP method in the exercise.

2013 SCEC Annual Meeting