Research Article
Probabilistic Seismic Hazard Analysis for Yemen
Table 3
Soil classification scheme based on shear wave velocities.
| Soil index value | NEHRP/CDMG class | Brief description | Shear wave velocities () m/s |
| 1.0 | AB | Very hard to firm rocks mostly metamorphic and igneous rocks | >760 | 1.5 | BC | Firm sedimentary rocks (mid-Miocene age) and weathered metamorphic | 760 | 2.0 | C | Sedimentary formation midlower Pleistocene age | 550–760 | 2.5 | CD | Weak rock to gravelly soils-deeply weathered and highly fractured bedrock | 270–550 | 3.0 | D | Holocene alluvial soils | 180–270 | 3.5 | DE | Young alluvium/water-saturated alluvial deposits | 90–180 |
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