The Bay Bridge had lost one section of the upper deck during the quake and was closed for about a month while the California Department of Transportation made repairs.
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During the 1989 Loma Prieta earthquake, a portion of the eastern section's upper deck collapsed onto the lower deck and the bridge was closed for a month.
We investigated the tsunami recorded at Monterey, California, during the 1989 Loma Prieta earthquake (MW=6.9). The first arrival of the tsunami was about 10 min after the origin time of the earthquake.
Also known as the Great Chilean earthquake (Spanish: Gran terremoto de Chile), it was the most powerful earthquake ever recorded. The earthquake hit on May 22 in the afternoon (19:11 GMT, 15:11 local time), approximately 100 miles (160 km) off the coast of Chile, parallel to the city of Valdivia.
Despite the terrifying image of a 250-foot wave about to wash over the Golden Gate Bridge, tsunamis do not actually pose a considerable threat to the Bay Area. Bay Curious is a podcast that answers your questions about the Bay Area.
In Ward's simulations, the wave reaches a maximum height of about 30 feet. “That's barely to the top the pylon,” says Ward, who is confident that the bridge would have no trouble withstanding the wave energy. “It probably wouldn't even touch the steel.”