Unified Interior Regions

California

States L2 Landing Page Tabs

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Image: Destroyed Causeway
October 17, 1989

Destroyed Causeway

Liquefaction and subsequent strong tidal action destroyed a causeway carrying the Moss Beach access road across tidewater basin near Moss Landing.

Image: Reinforcement Bars of Cypress Viaduct
October 17, 1989

Reinforcement Bars of Cypress Viaduct

Reinforcement bars exposed at the base of the Cypress viaduct near 14th Street.

Image: Aerial View of Slide
October 17, 1989

Aerial View of Slide

Aerial view of slide at Daly City. This is the largest slide triggered by the earthquake in San Mateo County, displacing approximately 36,700 cubic meters (48,000 cubic yards) of material. The base is about 152 me (500 ft) across at its widest point.

Image: Lateral Compression
October 17, 1989

Lateral Compression

Drain grating shows the effects of lateral compression.

Image: Roadcut near Summit Road
October 17, 1989

Roadcut near Summit Road

This roadcut near Summit Road failed during the initial earthquake and subsequent aftershocks. To mitigate further sliding, Caltrans decreased the slope angle.

Image: Vent of Sand Volcano
October 17, 1989

Vent of Sand Volcano

Vent of sand volcano produced by liquefaction is about 4 ft across in strawberry field near Watsonville. Strip spanning vent is conduit for drip irrigation system. Furrow spacing is about 1.2 m (4 ft) on center.

Image: Crushed Car
October 17, 1989

Crushed Car

Crushed car near the intersection of Fifth and Townsend Streets, South of Market.

Image: Ground Cracking and Differential Settlement
October 17, 1989

Ground Cracking and Differential Settlement

Ground cracking and differential settlement dueg to liquefaction of beach and Salinas River deposits damaged approach and abutment of bridge linking Moss Landing spit to the mainland, near Moss Landing Marine Laboratory.

Image: Cypress Viaduct
October 17, 1989

Cypress Viaduct

Remnant portion of the north- and south-bound Cypress viaduct exposing box girders near 14th Street.

Image: Radio Transmission Towers
October 17, 1989

Radio Transmission Towers

KGO radio transmission towers, built on bay mud in a salt-evaporation pond used by the Leslie Salt Company. Note progressively less damage to towers away from viewer.

Image: Radio Transmission Towers
October 17, 1989

Radio Transmission Towers

KGO radio transmission towers.

Image: Buckled Sidewalk
October 17, 1989

Buckled Sidewalk

Downtown sidewalk buckled due to compression.