Project Abstract
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Simulations were performed on the SCEC Broadband Platform for a suite of earthquake scenarios, using multiple rupture generators (GP and UCSB) and three broadband simulation techniques (GP, UCSB, SDSU). RotD50 was computed at 60 total sites in 20 and 40 kilometer distance-to-rupture bands around the fault plane for each scenario/rupture generator/simulation technique combination, using the default parametric settings for each technique. The spectral amplitude predictions were compared between each simulation technique over the period range of 0.01-10 seconds in order to provide insight as to how the methods, in their default form, compare given the same input rupture model. These insights will serve as a baseline for referencing the future differences observed between models; a) when default settings are adjusted and b) for forward earthquake validations and simulations, to allow for meaningful comparisons. In addition to analyzing the average results with respect to spectral period, spatial comparison results are presented in map form – both to compare simulation techniques with each other, and to compare simulation predictions with those of several Ground Motion Prediction Equations. Results are presented for the first earthquake scenario, using both rupture generators. Further interpretation of the results not presented here will be documented in a supplemental report to SCEC, utilizing finalized versions of the Broadband Platform simulation codes. |
