Map: California updates tsunami hazard areas with most changes in the Bay Area

The California Geological Survey and the Governor’s Office of Emergency Services released an update to the state’s tsunami hazard area map, with the latest changes concentrated on seven counties — mostly in the Bay Area.

The designated area is primarily used to help cities and counties assess tsunami risk and develop plans to deal with the threat. However, the CGS does recommend that if you are on land and in the hazard area, you should leave immediately after feeling a long earthquake or if you receive an official evacuation notification.

Live Map: See the epicenter for the latest California earthquakes

The hazard areas were based from 2009 Tsunami Inundation Maps for Emergency Planning and improved high-resolution computer modeling of tsunami scenarios. The counties that saw updates Friday are Marin, Napa, San Diego, Santa Cruz, Solano, Sonoma and Ventura.

The last update was in July 2021. The update accounts for 1,000-year historical tsunami events. Previous maps only calculated 100- to 500-year historical events.