Oregon Earthquake Swarm Continues To Puzzle Researchers

April 17, 2008

That’s how researchers at Oregon State University’s Hatfield Marine Science Center (HMSC) are describing a swarm of earthquakes they are monitoring off the central Oregon coast, about 150 nautical miles southwest of Newport. Since April 1, they have recorded more than 600 quakes in an area not known for a high level of seismic activity.

“We’ve never seen a swarm of earthquakes in an area such as this,” said Robert Dziak, who is among the scientists from OSU using a network of underwater hydrophones to listen for the sounds of ocean floor earthquakes and other phenomena from their labs at HMSC. “We’re not certain what it means.”
A marine geologist and seismologist who works with both OSU and the National Oceanic and Atmospheric Administration’s Pacific Marine Environmental Laboratory, Dziak called the swarm “unique” because it’s occurring in the middle of what’s known as the Juan de Fuca plate, rather than at the edges where it rubs against other such plates in the earth’s crust.

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