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If the ground starts to shake, get to higher ground ASAP – GeekWire

If the ground starts to shake, get to higher ground ASAP – GeekWire

 


Details from a new study predicting the potential effects of an earthquake in the Seattle Fault Zone and the resulting tsunami. (Photo by Washington DNR)

If a really big earthquake strikes off the coast of Seattle, the city’s shores can be hit by massive tsunamis within three minutes. In a worst-case scenario, waves hitting the Magnolia Bluff neighborhood in Seattle could reach 33 feet.

That’s the grim warning from a report released Thursday by the US State Department of Natural Resources.

The takeaway: If the ground starts shaking in the greater Seattle area, quickly move to higher ground.

Most often, when we think of tsunamis, we think of our offshore coast and our communities along the Pacific Ocean. “There is a long history of earthquakes on faults in Puget Sound,” Public Lands Commissioner Hilary Franz said, in a statement announcing the report.

Franz emphasized the importance of ensuring that communities at risk are informed and that response plans are developed.

While much attention has historically been given to earthquakes generated by the Cascadia subduction zone, which is centered along a submarine fault off the west coast, the new study focuses on the Seattle fault zone. This much shorter fault extends from east to west under the Puget Sound. It extends through the offshore city of Bremerton, through Bainbridge Island, through Seattle and east past Bellevue.

The last earthquake on this fault occurred about 1,100 years ago, and the fault is still active.

Map showing the Seattle Fault Zone (SFZ). (Photo by Washington DNR)

The research considered a worst-case and least likely scenario caused by a 7.5-magnitude earthquake. In this case, the tsunami waves will first hit north of Elliott Bay, the body of water off the coast of downtown Seattle; Alki Point west of Seattle; and the eastern shoreline of Bainbridge Island. The waves can reach Olympia, the southernmost point of the Puget Sound, within an hour and extend north into Canada.

The large waves and strong currents generated by the earthquake can last up to three hours. The tsunami will also cause widespread flooding of the coasts and prompt the floods of rivers that drain into the sound.

An earthquake will push some land masses upward, a phenomenon known as uplift, while others may be pushed downward or subside.

The report was written by geologists from the Washington Department of Geological Survey at DNR and included researchers from the National Oceanic and Atmospheric Administration (NOAA) and the University of Washington.

The study relied on information from geological records, indigenous oral history, and scientific models.

The report notes that warning signs of an impending tsunami include the earthquake itself, the drawing of water offshore or a sudden surge, or the roaring sound of the sea.

In January, the free MyShake app became widely available in Washington to provide early warnings that the earthquake had begun.

“It is important to be aware of the normal warning signs of a tsunami,” the report’s authors said. “It may be too much time to wait for an official signal.”

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