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  1. NZtoUSA

    SEISMIC: USGS Unified Hazard Tool Parameters vs. Design Code Seismic Design Parameters

    I'm curious why the unified hazard tool PGAs I'm getting are 0.05g smaller than those from AASHTO or my state seismic tool. There really is no good explanation on the USGS, except to say that they are different so you shouldn't use the UHT... Anyone have an idea why? Are they disregarding some...

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