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Volcanic Plume, Gaua Volcano

Volcanic Plume, Gaua Volcano

Gaua Volcano, in the South Pacific archipelago Vanuatu, entered an “eruptive phase” on September 27, 2009, according to the Vanuatu Geohazards Observatory. Since then the volcano has exhibited near-continuous emissions of ash and steam, punctuated by intermittent explosions.

This satellite image shows the center of Gaua, including Mont Garet—the volcano’s summit—and the crescent-shaped Lake Letas. The brown-colored plume suggests that the volcano is emitting ash as well as steam and other volcanic gases. Green, relatively healthy vegetation sourrounds Mont Garet on three sides, but the vegetation to the west (top) is brown. It was likely either killed by toxic gases from the volcano or covered with ash. The Advanced Land Imager (ALI) aboard NASA’s Earth Observing-1 (EO-1) satellite captured this image on December 29, 2009.

ReliefWeb reported that 400 people were evacuated from coastal villages to the west of Mont Garet in late November 2009. The Vanuatu Geohazards Observatory measured 3,000 metric tons (7 million pounds) of sulfur dioxide emissions on December 17, 2009 [compared to 800 metric tons (2 million pounds) per day at Kilauea].

NASA Earth Observatory image by Robert Simmon, using EO-1 ALI data provided by the NASA EO-1 team. Caption by Robert Simmon.

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