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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.
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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Swarm of earthquakes strikes Mount St. Helens

In the past eight weeks, more than 130 small earthquakes have trembled beneath the surface of Mount St. Helens.

Swarm of earthquakes strikes Mount St. Helens

In the past eight weeks, more than 130 small earthquakes have trembled beneath the surface of Mount St. Helens.