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California updates tsunami risk maps for 7 counties

California updates tsunami risk maps for 7 counties

 


The California Geological Survey has released updated tsunami risk maps for seven counties to help users determine if they are in flood risk areas and plan. Friday’s revised interactive maps cover San Diego, Santa Cruz, Ventura, Marin, Sonoma, and Solano. and Napa Counties. The new maps reflect new data and improved computer modeling since the publication of a previous series of maps in 2009, as well as threats from tsunamis that originated far and locally, the Geological Survey said in a press release. Modeling in Santa Cruz County shows that an earthquake in a subduction zone off the Aleutian Islands could unleash a tsunami 18-25 feet (5.5-7.6 meters) over the Santa Cruz Pass, more than double the height suggested in 2009, the agency said. Experts say this is the worst case scenario. “The other part of that also is that if we have a local earthquake, it’s always a good idea to remind people that you want to move away from the coast because there is the potential for a local earthquake to cause a landslide in our flooded valley and create that ‘Local Tsunami’ The shores of California have been hit by more than 150 tsunamis since 1800, and while most were minor, some were highly destructive and deadly. In 1964, a tsunami triggered by a powerful earthquake struck Alaska’s Crescent City, California, hours later. Much of the commercial area was leveled and dozens of people were killed, and most recently, the tsunami from the 2011 earthquake in Japan caused about $100 million in damages to California ports and harbors, and ocean surges from a volcanic eruption in Tonga last January cost about $10 million. dollars in damage to ports in Santa Cruz and Ventura counties, and Santa Cruz County officials say they will use the new mapping tool to help prepare areas that may be in the path of a potential tsunami. The State of California is part of the state’s Department of Conservation.

Sacramento, California –

The California Geological Survey has released updated tsunami risk maps for seven counties to help users determine if they are in areas at risk of inundation and plan.

Revised interactive maps released Friday cover San Diego, Santa Cruz, Ventura, Marin, Sonoma, Solano, and Napa counties.

The new maps reflect new data and improved computer modeling since the publication of a previous series of maps in 2009, as well as threats from tsunamis that originated far and locally, the Geological Survey said in a press release.

In one example of the updates, new modeling for Santa Cruz County shows that an earthquake in a subduction zone off the Aleutian Islands could unleash a tsunami 18-25 feet (5.5-7.6 meters) over the Santa Cruz Pass, more than twice the height suggested in 2009, the agency said. .

But experts say this is the worst case scenario.

“The other part of that also is if we have a local earthquake, it is always a good idea to remind people that you want to move away from the coast because there is a possibility of a local earthquake causing a landslide in our flooded valley and creating a local tsunami,” said Dave Reed, response manager. recovery and resilience.

The Geological Survey said California’s beaches have been hit by more than 150 tsunamis since 1800, and while most were minor, some were highly destructive and deadly.

On March 28, 1964, a tsunami caused by a powerful earthquake struck Alaska’s Crescent City, California, hours later. A large part of the commercial district rumbled and dozens of people were killed.

Most recently, a tsunami from the 2011 earthquake in Japan caused about $100 million in damages to California’s harbors and ports, and ocean waves from last January’s volcanic eruption in Tonga caused nearly $10 million in damage to ports in Santa Cruz and Ventura counties.

Santa Cruz County officials say they will use the new mapping tool to help prepare areas that may be in the path of a potential tsunami.

The California Geological Survey is part of the state’s Department of Conservation.

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