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Yellowstone National Park, Wyo.

Trembling earth: More than 1,700 tiny earthquakes have rattled Yellowstone National Park since Jan. 17, the second-largest cluster of such rumblings ever recorded there. The quakes, which have ranged from magnitude 0.5 to 3.1, are concentrated about 10 miles northwest of the Old Faithful geyser. That seismically active region sits atop the caldera of a “supervolcano’’ that last erupted 640,000 years ago. If it exploded again, it would kill people for hundreds of miles around, and cover most of the U.S. with ash. Geophysicists say, though, that this swarm of tremors shows little sign of building toward a devastating event. “We’re not seeing a pattern that is really discernible yet,” said Henry Heasler of the Yellowstone Volcano Observatory.

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