EARTHQUAKE SWARM IN PACIFIC NORTHWEST—On the morning of Sunday, Feb. 28, undersea hydrophones began detecting the most intense swarm of earthquakes to occur in the last three years along the Juan de Fuca Ridge, about 200 miles off the Pacific Northwest coast. Each red dot represents an earthquake epicenter. Within five and a half days, undersea hydrophones detected 3,742 earthquakes. (Illustration by Jayne Doucette, WHOI Graphic Services)[back]
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