A significant limitation of site-specific probabilistic seismic hazard analysis (known as PSHA) is usually overlooked. The seismic design loads derived from PSHA can only be expected to control the risk at individual locations (site-specific risk); they cannot be expected to control the risk at multiple locations simultaneously affected by an earthquake (aggregate risk). This article presents a method of calculating the seismic design loads for controlling both the site-specific and the aggregate risks.

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