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Table 2 Site classification based on fundamental site period and corresponding NEHRP site classes (after Zhao et al. 2006)

From: Seismic microzonation of a region with complex surficial geology based on different site classification approaches

Site class Description Site period NEHRP site class
Hard rock    A
 SC I Rock T0 < 0.2 s A + B
 SC II Hard soil 0.2 ≤ T0 < 0.4 s C
 SC III Medium soil 0.4 ≤ T0 < 0.6 s D
 SC IV Soft soil T0 ≥ 0.6 s E + F