In his recent paper, “PSHA Validated by Quasi Observational Means,” Musson (2012) intended to confirm the validity of Cornell–McGuire probabilistic seismic-hazard analysis (PSHA) by “quasi-observational means.” However, Musson proved exactly the opposite (i.e., PSHA is invalid). Musson’s attempts to prove the validity of Cornell–McGuire PSHA were founded on confusion between probability (a dimensionless quantity) and frequency (a dimensional quantity with unit of per year [1/yr]) and a misunderstanding and misuse of statistics.

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PSHA is a mathematical formulation derived from a rigorous probability analysis on the statistical relationships of earthquake magnitudes, locations, and ground-motion attenuation. The basic formulation of...

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