Word: swarmed
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Dates: during 2010-2019
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...Monday, a swarm of nearly 500 earthquakes on the western edge of Yellowstone National Park began. Though they increased in frequency and intensity Tuesday, experts who monitor the area say they did not warrant emergency measures. A little over one year ago, there was some concern over a series of quakes centered around the north shore of Yellowstone Lake, which overlays some of the ancient, yet still simmering, Yellowstone Caldera. (See why a spurt of quake activity raised fears in Yellowstone...