California's Hidden Tsunami Risk: Near-Shore Earthquakes
While California isn't typically known for devastating tsunamis, experts are raising concerns about the potential danger posed by near-shore earthquakes. These earthquakes, occurring just offshore, could trigger tsunamis that reach coastal communities with alarming speed.
A near-shore tsunami presents a unique challenge because the time between the earthquake and the arrival of the first wave can be as little as 10 minutes. This leaves very little time for emergency alerts to be issued and for residents to evacuate to safety.
Who is at Risk?
The entire 840-mile California coastline is potentially vulnerable, from densely populated Southern California cities to more remote areas in the north. Hazard mitigation plans for Los Angeles City and County highlight the potential for locally generated tsunamis to reach significant heights in various locations:
- Marina del Rey: Up to 5 feet above mean sea level
- Manhattan Beach and San Pedro: Up to 7 feet
- Long Beach and Santa Monica Pier: Up to 8 feet
- Malibu: Up to 9 feet
- Catalina Island: Up to 30 feet
These heights are dependent on the specific fault that ruptures and its location.
Preparing for the Unpredictable
The potential for damage and casualties along the California coast is significant. Experts emphasize the importance of understanding tsunami risks and developing preparedness plans. Knowing evacuation routes and heeding warnings are crucial steps in protecting yourself and your community.
More than 680,000 Californians are in a tsunami hazard area during the daytime. A major tsunami could cause an estimated $12.6 billion in damage across California's coastal counties, and that's not even including ports and harbors.
Stay Informed and Be Ready
Keep abreast of the latest tsunami advisories and warnings from official sources like the National Weather Service. Familiarize yourself with your local community's emergency plans and evacuation routes. Taking proactive steps can greatly improve your safety in the event of a tsunami.