Mount St. Helens is a volcano in the state of Washington, seen here in 2004. It erupted in 1980, spewing out more than 1 cubic kilometer of material. Scientists believe, by comparison, that Martian supervolcanoes could spout 1,000 cubic kilometers of volcanic material.
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Swarm of earthquakes strikes Mount St. Helens
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In the past eight weeks, more than 130 small earthquakes have trembled beneath the surface of Mount St. Helens.
1:42 • Source: CNN
Strong earthquakes around the world 16 videos
Mount St. Helens is a volcano in the state of Washington, seen here in 2004. It erupted in 1980, spewing out more than 1 cubic kilometer of material. Scientists believe, by comparison, that Martian supervolcanoes could spout 1,000 cubic kilometers of volcanic material.
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