Tsunamis are a serious threat to California’s coastline, and experts are warning about the potential devastation they could cause. If a major tsunami strikes, it could affect over 680,000 residents during the day. The estimated damage could reach $12.6 billion across the state’s coastal and bayside counties, not counting the impact on critical infrastructure like ports and roads.
There are two main types of tsunamis to consider. The first is a "distant-source" tsunami, which can occur after a significant earthquake far away, such as in Alaska. This type would allow for ample warning, with up to six hours for Los Angeles and five hours for San Francisco. However, despite the warning, the waves could be extremely high, causing severe flooding in many areas.
The second type, a "near-source" tsunami, is much more immediate. It can hit within 10 minutes of a nearby earthquake, leaving little time for people to evacuate. This scenario poses a greater risk to coastal communities, which are often densely populated.
For Southern California, a distant-source tsunami could lead to over 350 injuries or fatalities if residents delay evacuating for just half an hour after an official warning. Los Angeles County would bear the brunt, with around 200 expected casualties. The potential wave heights could reach 15 feet in places like Marina del Rey and Santa Monica Pier, while other areas could see waves as tall as 10 feet.
In the Central Coast region, the situation is similarly dire. A distant-source tsunami could result in more than 230 injuries or deaths, particularly in Santa Cruz County, which could see over 130 casualties. The damage estimates for this area could exceed $3.5 billion.
The Bay Area faces its own risks. A distant-source tsunami could injure or kill over 1,300 people if they wait to evacuate. Areas like San Francisco could see waves reaching 32 feet. The potential damage here could surpass $6.5 billion.
For the North Coast, the threat is even more pronounced due to its proximity to the Cascadia subduction zone. If a large earthquake occurs, more than 3,150 people in Del Norte County could be at risk. Flooding could reach as high as 50 feet in some areas.
Experts emphasize the importance of preparedness. Understanding the risks and knowing what to do in the event of a tsunami can save lives. With California’s coastline being vulnerable, residents are urged to stay informed and ready to act in case of an emergency.