No injuries were reported, but the Biscuit Basin area was closed for visitor safety.
In this photo released by the National Park Service, park staff assess the damage to Biscuit Basin boardwalks after a hydrothermal explosion at Biscuit Basin in Yellowstone National Park, Wyo., on Tuesday.CHEYENNE, Wyo. — A surprise eruption in Yellowstone National Park shot steam, water and dark-colored rock and dirt high into the sky Tuesday and sent sightseers running for safety.
Vlada March was on a tour in the basin when her guide said something unusual was happening. March started taking video. Rocks that fell from the sky smashed the boardwalk they had been walking on. March's mom, who had been sitting on a bench near the explosion, was shaken and dirty but otherwise fine, she said.
The explosion could have resulted from a clogged passageway in the extensive natural plumbing network that underlies Yellowstone's world-famous geysers, hot springs and other thermal features, said scientist Mike Poland with the Yellowstone Volcano Observatory. He said the explosion was “on the big side” of eruptions that occur periodically — usually when no one is around let alone throngs of tourists.
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