Swarm of tremors rumble beneath Central Oregon Coast, could be precursor to the 'big one'

KATU.com - 05-23

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PORTLAND, Ore. — Experts are watching a swarm of tremors along the Pacific Northwest coast, which they say could one day be a precursor to the “big one.”. These tremors are tiny earthquakes that happen while tectonic plates slowly slip past each other. Most of the time they are too small for people to feel.