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High Seismic Risk

jurisdiction has high seismic risk if it is located in a county which is categorized in the 2021 IBC for Risk Category II as having a design spectral response acceleration at short-periods (SDS) greater than or equal to 0.5g based on the most conservative of site class C or D, or as having a design spectral response acceleration at long-periods (SD1),  greater than or equal to 0.2g, or was mapped in the 2021 IRC as having high or very high earthquake risk (Seismic Design Category D0, D1, D2, and E for residential buildings).