Table 3.--Average amplification
|
Average amplification factors* |
Average S-wave velocity |
Surficial geologic unit |
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|
Short Period |
Intermediate Period |
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|
(2.0 to 6.0 Hz) |
(0.5 to 1.5 Hz) |
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| (1) | SD(1) | (2) | (1) | SD(1) | (2) | (m/s) | |
| 1.0 | 0.09 | 1.0 | 1.0 | 0.13 | 1.0 | 710 | Mesozoic and pre-Mesozoic crystalline and metasedimentary rocks. |
| 1.8 | 0.12 | 1.2 | 1.8 | 0.17 | 1.5 | 407 | Tertiary and pre-Tertiary sedimentary rocks. |
| 1.6 | 0.12 | 1.3 | 2.2 | 0.10 | 1.5 | 368 | Pleistocene alluvium |
| 1.9 | 0.11 | 1.3 | 2.2 | 0.16 | 1.7 | 321 | Holocene alluvium |
(1) Average amplification for all sites within the indicated surficial geologic unit.
(2) Amplification from regression relationship between S-wave velocity and site response using
average S-wave velocities for the indicated geologic unit.
SD(1) Standard deviation for average (1).
*Normalized to 1.0 for Mesozoic units. (pre-normalization values for Mesozoic units: 1.4, short period (1);
1.9, short period (2); 1.0, intermediate period (1); 1.3, intermediate period (2))
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