"The average duration of strong shaking in Seattle is about 100 seconds, about four times as long as from the 2001 Nisqually earthquake," the magnitude 6.8 earthquake that rattled the Seattle region, study collaborator Art Frankel, a USGS seismologist and affiliate faculty member at the University of Washington, said in a statement.

The simulations don't paint a pretty picture for Seattle or the coastal areas of Washington, Oregon, British Columbia and Northern California, but the locations of some epicenters were a bit more forgiving than others. "Have your earthquake kit and know what you would do in an earthquake. If a magnitude 9.0 earthquake were to hit the Pacific Northwest, People in Seattle would fare much better if the epicenter struck beneath the tip of northwest Washington. Live Science is part of Future US Inc, an international media group and leading digital publisher. © Over the course of the 50 simulations, "we always saw the strongest shaking along the coast, since they are closest to the offshore fault," Wirth told Live Science. It would be worse for Seattle if the epicenter of a magnitude 9.0 earthquake hit offshore but sent seismic waves inland, as this simulation shows. "We varied it randomly in our simulations.".

(There are other active faults in the Pacific Northwest, but the CSZ is capable of triggering the strongest earthquakes, according to the Washington State Department of Natural Resources. The peak ground velocity describes the maximum speed at which the ground moves during an earthquake and typically correlates well with felt shaking intensity — and damage — during large earthquakes. You can imagine if you shake a plate that has some Jell-O on it, the Jell-O will shake much more [than the plate] because it's so weak.".

"The last one occurred in the year 1700.

Moreover, places close to strong patches also experience strong shaking. That's the best we can do.". It's impossible to predict earthquakes with current technology, but the Pacific Northwest isn't due for a big earthquake quite yet. "That kind of weak material tends to make the ground shake more," Wirth said. ABCNews.com

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For each simulation, they randomly changed three variables: the location of the earthquake's starting point at ground level, known as the epicenter; how far inland the earthquake ruptured (i.e., how close it got to major inland cities, such as Seattle and Portland, Oregon); and the location of strong patches, or places that are known to produce especially strong ground shaking. Earthquake experts say current building codes don’t reflect the Seattle area’s riskiest features — but the outlook could improve if the Really Big One can wait. Simulated peak ground velocities from a magnitude-9.0 earthquake on the Cascadia Subduction Zone highlight differences in the effect of such an earthquake throughout the Puget Sound region. There was also consistently strong shaking in areas on top of sedimentary basins, which are basins filled with layers of different sediments, including the Seattle basin. Seattle could escape catastrophic damage if the conditions are right.

At the fault line, the offshore Juan de Fuca plate is moving toward, and eventually under, the plate holding the continent of North America.

5 Nov 12:44: Magnitude recalculated from 3.1 to 2.6. 5 Nov 15:50: Hypocenter depth recalculated from 29.1 to … [The 10 Biggest Earthquakes in History], The Pacific Northwest is in earthquake country largely because of the Cascadia Subduction Zone (CSZ), a 620-mile-long (1,000 kilometers) fault stretching from northern Vancouver Island, Canada, to Cape Mendocino, California, according to the Pacific Northwest Seismic Network.

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