Updated tsunami maps show new hazards, and will be released on the 10th anniversary of the Japan earthquake | Wild Rivers Hotspot

Jessica Cejnar / Yesterday @ 4:13 pm Updated tsunami maps show new hazards, and will be released on the 10th anniversary of the Japan earthquake

This map shows the greater tsunami hazard zone identified in 2021 versus the region identified in 2009. Courtesy of CalOES and California Geological Survey

Although there has not been a drastic change in Del Norte, the new tsunami hazard maps show several areas more at risk than was initially thought.

Presented to the Del Norte County Board of Supervisors on Tuesday, the new maps take into account better science and modeling as well as lessons learned from the 2011 Tohoku earthquake and tsunami in Japan.

“Instead of being a 500-year return map, it’s updated to a 1,000-year return map, so don’t be as surprised as it happened in Japan,” said Kimmy Scott, director of emergency services at Del Norte, president of Redwood Coast Tsunami Work. “(The danger) hasn’t changed drastically, but there are some areas that go up to 101 in the city where it goes further and in the Birch area where it hasn’t been before. There are also areas in the Klamath River Valley that didn’t exist before.”

Now that the Board of Supervisors has adopted the new tsunami hazard maps, which have replaced the maps from 2009, Scott’s office and the Redwood Coast Tsunami Task Force will conduct a six-month public education and awareness campaign. This will include social media, broadcast, and a propaganda clip, she said, when it is safe to stay outside.

Scott said the maps will be released to the public in March, to celebrate the tenth anniversary of the earthquake and tsunami in Japan. California will also celebrate Tsunami Education Week from March 22-26, which will also include public awareness, she said.

“On the 24th, which is Wednesday, it will be the test of the live siren, which people know,” she said. “On the 24th, it won’t just be the sirens, we’ll activate the entire emergency alarm system – the sirens, the NOAA radio broadcast, the Everbridge push, the civil airlift, and people will see that on the TV – the way it was a real tsunami.”

Scott said the year will culminate in large-scale evacuation exercises in October. This will include activating the Del Norte County Emergency Operations Center, urging the public to conduct the evacuation, and setting the time and how long it will take.

Scott said updated tsunami hazard maps will play a vital role in this exercise.

“We just want everyone to have a muscle memory of where these new danger lines are,” she said. “It’s been proven over and over again if you train, when a disaster strikes and you don’t think clearly, it is a lot easier to go back to what we did.

On Tuesday, Scott presented the maps to the Board of Supervisors with representatives from the California Office of Emergency Services and the California Geological Survey. She is also joined by fellow Redwood Coast Tsunami Work Group co-president, Ryan Aylward, of the Eureka office of the National Weather Service.

Scott said updating the tsunami risk maps was an 18-month process, which included input from local first responders and other emergency preparedness representatives.

According to Jason Patton, an engineering geologist with the California Geological Survey, the maps are updated statewide and are based on both far-source and local tsunamis. In Del Norte, the Cascadia subduction zone will generate local tsunamis. The new maps are also based on high-resolution elevation data, Patton said, unlike the 2009 low-resolution topographic maps.

In a sign that the new maps are now calling an area near the intersection of US 101 and Washington Boulevard a dangerous area, Chairman Chris Howard asked about evacuation routes.

“Our intersection between Washington and Interstate 101 was primarily within the operating area of ​​the tsunami,” Howard said. “This causes a little bit of anxiety because it’s our four-lane highway, so to speak, north out of town. I suppose our OES and others really take this into account when planning evacuation routes.”

Scott noted that although 2021 maps depict the worst-case scenario, most of the tsunamis that will affect Del Norte County will be fewer events.

“We plan our business against a set of criteria with different levels of potential immersion,” she told supervisors. “We do not want to evacuate more people than is necessary, but we want to have the information and plans ready in case we face the worst scenario.”

Scott said Del Norte OES may not evacuate everyone in areas within risk limits on the new maps during a distant source tsunami. She said the California Geological Survey will let local emergency personnel know what to expect if a tsunami is on its way.

“We will have a series of small lines to be developed where we can evacuate the appropriate number of people,” she said.

Scott said she and her colleagues at CalOES, the California Geological Survey and the Redwood Coast Tsunami Task Force, submit new risk maps to Crescent City Council on February 16.

People can also see a virtual exhibition and other information about local earthquake and tsunami hazards by visiting the Redwood Coast Tsunami Work Group website, she said.

Documents:

• View tsunami hazard maps

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