Table 2 Site classification based on Vs30 (National Earthquake Hazard Reduction Provision, 1998)
From: Seismic hazard microzonation of Bengkulu City, Indonesia
NEHRP Site Class | General Description | Range of Vs30 [m/s] |
|---|---|---|
A | Hard Rock | Vs30 > 1500 |
B | Rock | 760 ≤ Vs30 ≤ 1500 |
C | Very Dense Soil and Soft Rock | 360 ≤ Vs30 ≤ 760 |
D | Stiff Soil [15 ≤ N ≤ 50 or 50 kPa ≤ N ≤ 100 kPa] | 180 ≤ Vs30 ≤ 360 |
E | Soil or any profile with more than 3 soft clay defiled as soil with PI > 20, w ≥ 40%, and su < 25 kPa | Vs30 < 180 |
F | Soils requiring site-specific evaluation | – |