- © 2015 by the Seismological Society of America
Online Material: Descriptions of validation events and scenarios; fixed and region‐dependent parameters; additional goodness‐of‐fit plots for ground‐motion prediction equations (GMPEs) versus data, simulations versus GMPEs, and pseudospectral accelerations (PSA) bias versus distance; and comparison of rupture models with associated PSA bias and time histories for Landers.
The Southern California Earthquake Center (SCEC) has completed phase 1 of its Broadband Platform (BBP) ground‐motion simulation results, evaluating the potential applications for engineering of the resulting 0.01–10 s pseudospectral accelerations (PSAs) generated by five different methods. The exercise included part A, in which the methods were evaluated based on the bias of simulation results to observations for 12 well‐recorded historical earthquakes: 7 in the western United States, 2 in Japan, and 3 in the eastern United States/Canada. In addition, part B evaluated simulation results for Mw 5.5, 6.2, and 6.6 scenarios at 20 and 50 km from the fault. The methods were assessed based on the bias of the median PSA for the 12 events in part A and on a specified acceptance criterion compared with Next Generation Attenuation‐West (NGA‐West) ground‐motion prediction equations (GMPEs) in part B. The results were evaluated by the bias of mean PSA from simulations using 1D velocity models with (see the electronic supplement of Goulet et al., 2015) with respect to recorded data corrected for site effects. The part A events and part B scenarios are described in Tables S1 and S2 (available in the electronic supplement to this article), respectively.
One of the five methods evaluated was the Broadband Synthetics Generator Module BBtoolbox, a hybrid method combining deterministic low‐frequency (LF) synthetics with high‐frequency (HF) scatterograms (Mai et al., 2010; Mena et al., 2010). The LFs may be computed using deterministic or dynamic descriptions in 1D or 3D media. The HF scatterograms are generated for each component of motion …