Day 198: Swarming

Gerry Broome, AP

"In the last eight days, there have been more than 400 earthquakes at Yellowstone National Park — where the volcanic system powers the geysers, mudpots and steam vents...When a bunch of earthquakes occur in a concentrated area in a short amount of time, geologists call it a "swarm." They're not unheard of at Yellowstone, but rarely have the earthquakes reached the magnitude and frequency of the past week." Read more from NPR

"While quakes are relatively common in Yellowstone, the intensity of this recent swarm has scientists baffled." -from NowPublic

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