The burst reached hundreds of feet into the air, destroying a nearby boardwalk and ejecting grapefruit-sized rocks tens to hundreds of feet away. Larger blocks weighing hundreds of pounds were found closer to the explosion site.
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Hydrothermal explosion near Old Faithful startles tourists, but is not a precursor to a volcanic eruption
The hydrothermal explosion in Biscuit Basin damaged boardwalks and sent tourists running. But so far, there have been no reported injuries.
