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How quakes could tip us off to the ‘Really Big One’

Episodic tremors
A map of coastal Washington state and British Columbia shows the sweep of an episodic tremor and slow slip event, or ETS, from February to April 2017. The colors denote the time of the event as shown on the color-coded time bar at the bottom. The gray circles on the color bar indicate the number of tremor events per day. (UNAVCO Graphic / Kathleen Hodgkinson)

WASHINGTON, D.C. — Is it the tick of Earth’s heartbeat, or a ticking time bomb? Either way, instruments that monitor a 14-month pattern in seismic activity could serve as an super-early warning system for the “Really Big One,” the massive earthquake that’s expected to hit the Pacific Northwest sometime in the next few centuries.

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By Alan Boyle

Mastermind of Cosmic Log, contributing editor at GeekWire, author of "The Case for Pluto: How a Little Planet Made a Big Difference," president of the Council for the Advancement of Science Writing. Check out "About Alan Boyle" for more fun facts.

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