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St. Helens

Incandescence is visible in fractures in a growing lava dome in the crater of Mount St. Helens on October 18, 1980. Several earlier lava domes formed after May 18, 1980 had been removed by explosive eruptions. This photo shows the beginning stages of the lava dome that grew incrementally until the end of the eruption in October 1986.

Type/Process: Lava Dome
Volcanic Status: Historical
Image Number: 028-089
Photographer: Terry Leighley, 1980 (U.S. Geological Survey)
Summit Elevation: 2549 meters
Latitude/Longitude: 46.20 N / 122.18 W
Timeframe: Last known eruption 1964 or later
Region: Canada and Western USA

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