37 years ago today the 1989 Loma Prieta earthquake hit San Francisco. It was a 6.9 earthquake that severely shook the bay area region at 5:04 p.m. for 20 seconds. It was so strong that we felt it down here in Los Angeles. Heavy glass vases walked off my display cabinets and the garage addition cracked and separated from the house. A quarter of the swimming pool water came out of the pool in waves. It went under the fence and flooded the neighbor’s garage. I was in a liquefaction zone.
Seeing the destruction and all those people trapped under the collapsed bridges was like a nightmare. Buildings were leaning over and being propped up by two by fours in the streets of San Francisco. People were trapped and crushed in the San Francisco-Oakland Bay Bridge and Cypress Street Viaduct, Nimitz. The top decks of the bridges collapsed onto the lower decks trapping people for days. It also cut off a major regional travel artery into and out of the city. It took years to rebuild the bridges.
The earthquake triggered major revisions to California building codes focusing on soft-soil amplification, foundation anchoring, cripple wall bracing and structural ductility. Old homes just fell off their foundations because the homes weren’t bolted to the foundations. Soft-story buildings had to be retrofitted after the second floors pancaked onto the first floors over carports. Homes in liquefaction zones needed reinforcement. The modern seismic retrofit industry started as a result of that earthquake. Seismic retrofit became mandatory in order to get insurance on older homes for mortgages.
There were aftershocks for days. I ended up with earthquake PTSD for a few months. Every time the people down the office hall from me rolled their heavy cart down the hallway the shaking would cause my heartrate to shoot up thinking it’s another earthquake. Because of that earthquake collapsing the bridges and overpasses I still get very nervous waiting for a light under an overpass. I do what I can to make sure I’m not under the overpass when the light turns red.
Hard to believe it’s been 37 years. We have learned a lot about earthquakes in the meantime and made major changes to building codes. We still have to be prepared for the next big earthquake. Everyone should have an earthquake kit and plan ready. A big earthquake could strike any day in California. #lomaprietaearthquake #california #losangeles #marycummins
Mary Cummins of Cummins Real Estate is a certified residential licensed appraiser in Los Angeles, California. Mary Cummins is licensed by the California Bureau of Real Estate appraisers and has over 43 years of experience.
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