Volcanic Eruptions

Explosions or emissions of lava, ashes and toxic gases from deep inside the earth, through volcanoes.

Definition source: National Park Service

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A researcher checks the calibration of a ground-mounted Global Positioning System (GPS) station on Mount St. Helens.

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Earth's Crust in Action

Lascar volcano in Chile is the most active volcano in the central Andes, with several eruptions occurring during the 1990s.

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In 1990, slow-moving pahoehoe lava from Kilauea Volcano gradually spread through the community of Kalapana, burning homes and covering parks, roads, and gardens. (Image courtesy of USGS)

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Sensing Remote Volcanoes

ASTER acquired this image of Mount St. Helens on August 8, 2000.

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Domes of Destruction

False-color composite image of Mount Kilauea, red indicates solidified rock from previous lava flows.

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Life on the Brink

Photograph of the eruption of Mt. Pinatubo, June 15, 1991

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Mar 5, 2000

Volcanoes and Climate Change

The image above shows the Greenland Ice Sheet

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Mar 9, 1996