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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