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Global Volcanism Program | Image GVP-02933

Beginning in October 1980, activity during 17 eruptive episodes built this lava dome that grew to 876 m above the crater floor, shown here in April 1983. During a 12-month period beginning in 1983 the dome primarily grew by magma rising into the interior of the dome, called endogenous dome growth. Hundreds of small gas-and-steam explosions occurred at the dome. Photo by Bob Symonds, 1983 (U.S. Geological Survey).

Beginning in October 1980, activity during 17 eruptive episodes built this lava dome that grew to 876 m above the crater floor, shown here in April 1983. During a 12-month period beginning in 1983 the dome primarily grew by magma rising into the interior of the dome, called endogenous dome growth. Hundreds of small gas-and-steam explosions occurred at the dome.

Photo by Bob Symonds, 1983 (U.S. Geological Survey).

Keywords: lava dome | volcanic gas | crater | eruption


St. Helens