LOS ANGELES COUNTY一 In March of this year, the California Geological Survey updated the Tsunami Hazard Area Maps for seven counties in California, including Los Angeles County.
This is the first time the maps have been updated since 2009 and a few areas saw a minor increase in hazard zones including Marina Del Rey, Port of Los Angeles, Long Beach, and Naples.
The changes to the maps were in part because of a recent tsunami modeling that reflected a large-scale disaster.
“One of the benefits of the new maps is that they incorporate a minimum baseline of flooding equal to a 1000-year event, which translates to a 5 percent probability of flood exceedance within the next 50 years,” said Rick Wilson senior engineering geologist and tsunami unit manager with the California Geological Survey. “In other words, we looked at extremely large but very rare tsunami events to create the maps.”
The 1000-year baseline and the extra buffer were added after research from the 2011 Great East Japan Earthquake and Tsunami, according to Wilson.
On March 11, 2011, Japan experienced a magnitude 9.0 earthquake near the Tōhoku region. The earthquake triggered a massive tsunami that took almost 20,000 lives and flooded more than 200 square miles,...
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