Something changes almost every day in Yellowstone: a geyser erupts that hasn’t erupted in years, a new fumarole pushes steam out of the ground, a hot spring runs dry. Almost every day there are earthquakes, most of them detectable only by the most sensitive of seismographs. Every once in a while there are bigger earthquakes, not necessarily as big as the one that caused the Hebgen Lake disaster, but still big enough to rattle dishes and people’s nerves.
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