Dear researchers

Maximum-direction ground motions are used to prepare seismic hazard maps provided in United State Geologic Survey (USGS) instead of geomean ground motions (the product of hazard assessment using modern ground motion attenuation functions). It is mentioned in ASCE 7-10 that the adjustment to get “maximum direction values” from “geomean values” is a factor of 1.1 for the short-period parameters and 1.3 for the long-period parameters.

Does anyone know how these factors have been derived?

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