USGS Earthquake Ground Shaking and its Potential Effects in the San Francisco Bay Region for a Repeat of the Great 1906 Earthquake
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Preliminary Estimates of Transportation Lifelines Located in
Each Site Class for the Southern San Francisco Bay Region
Site Class Bridges Highways Railways
  %
B, 1b firm rock 9 11 0
C, II soft rock 21 32 0
D, III stiff soils 51 43 81
E, IV soft soils 19 14 19
Total 100 100 100