As of 1 p.m. Monday, Oregon's Mount Hood has seen about 40 earthquakes in close proximity over less than 18 hours. Such clusters of earthquakes are known as a swarm. The location of the quakes is on the southern flank of the volcano, and they are small, magnitude 2.0 or less.
Alicia Hotovec-Ellis is a volcano seismologist at the Pacific Northwest Seismic Network at the University of Washington and an expert on earthquake swarms. She says the swarms have happened in the same place before. The quakes on Mount Hood are not seen as a warning of an eruption and are probably related to water moving through rock.
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