Cascadia’s Locked Fault Means Massive Earthquake Is Due in Pacific Northwest

The Cascadia fault in the Pacific Northwest is locked up, meaning that a massive megathrust earthquake could occur at any time, seismologists are warning.

“It’s impossible to know exactly when the next Cascadia earthquake will occur,” said Evelyn Roeloffs of the U.S. Geological Survey, speaking last year on the 313th anniversary of a massive quake that hit in 1700—the last major one in the region. “We can’t be sure that it won’t be tomorrow, and we shouldn’t make the mistake of assuming we have decades to prepare.”

The tectonic plates normally glide and rub against each other, but periodically they become wedged together. When the fault quits sliding and becomes “locked” in place, it builds energy until it finally ruptures, relieving hundreds or thousands of years of stored-up stress in seconds, Roeloff said.

Now, earthquake scientists from Canada and the U.S. who monitor seismic activity along the Cascadia coast have concluded that the dangerous fault line is fully locked, which carries serious implications for an earthquake in the Pacific Northwest.





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Last Edited by Jwnlwplus4 on 06/02/2015 07:31 AM