II. Bay Bridge

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15. Aerial view of roadbed collapse near the interface of the cantilever and truss sections of the San Francisco-Oakland Bay Bridge. View northwestward. [C.E. Meyer, U.S. Geological Survey]

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16. Aerial view of the collapsed section of the San Francisco-Oakland Bay Bridge. View westward. [C.E. Meyer, U.S. Geological Survey]

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17. Sand boil or sand volcano measuring 2 m (6.6 ft) in length erupted in median of Interstate Highway 80 west of the Bay Bridge toll plaza when ground shaking transformed loose water-saturated deposit of subsurface sand into a sand-water slurry (liquefaction). Vented sand contains marine-shell fragments. [J.C. Tinsley, U.S. Geological Survey]