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Earth and Space Sciences · Glossary

What is Lava dome?

Definition 6.4 University Earth and Space Sciences — Year 2 · Chapter 6 — Volcanic Eruptions

A lava dome is a steep-sided mound of viscous lava, typically dacite or rhyolite, extruded slowly from a vent and piling up over it instead of flowing away.

Left: a Hawaiian fountain on the Pu‘u ‘Ō‘ō cone of Kīlauea, October 1983 (J. D. Griggs, USGS). Centre: the Plinian column of Mount St. Helens, 18 May 1980 (Austin Post, USGS). Right: the eruption column of Mount Pinatubo on 12 June 1991, three days before the climactic eruption (Dave Harlow, USGS). All three photographs are in the public domain. Left: a Hawaiian fountain on the Pu‘u ‘Ō‘ō cone of Kīlauea, October 1983 (J. D. Griggs, USGS). Centre: the Plinian column of Mount St. Helens, 18 May 1980 (Austin Post, USGS). Right: the eruption column of Mount Pinatubo on 12 June 1991, three days before the climactic eruption (Dave Harlow, USGS). All three photographs are in the public domain. Left: a Hawaiian fountain on the Pu‘u ‘Ō‘ō cone of Kīlauea, October 1983 (J. D. Griggs, USGS). Centre: the Plinian column of Mount St. Helens, 18 May 1980 (Austin Post, USGS). Right: the eruption column of Mount Pinatubo on 12 June 1991, three days before the climactic eruption (Dave Harlow, USGS). All three photographs are in the public domain.
Left: a Hawaiian fountain on the Pu‘u ‘Ō‘ō cone of Kīlauea, October 1983 (J. D. Griggs, USGS). Centre: the Plinian column of Mount St. Helens, 18 May 1980 (Austin Post, USGS). Right: the eruption column of Mount Pinatubo on 12 June 1991, three days before the climactic eruption (Dave Harlow, USGS). All three photographs are in the public domain.
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