where y is in g, a = -2.487, b = 0.534, c = -1.280, h = 3.94, e_{1} = 0, e_{2} = 0.365, e_{3} = 0.065, e_{4} = 0.053, σ_{event} = 0.117 and σ_{record} = 0.241 (or alternatively σ_{station} = 0.145 and σ_{record} = 0.232). For r_{hypo}:
where y is in g, a = -2.500, b = 0.544, c = -1.284 and σ = 0.292 (do not report site coefficients for r_{hypo}).
Base classifications on recently collected detailed site information from site investigations, census data, topographic maps, data from previous reports on depth of bedrock, and data from public and private companies. Subscripts correspond to classification in Eurocode 8.