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Thursday, August 04, 2011

Alaska: Cleveland Volcano at Orange

Eruption Cleveland Volcano

August 4, 2011 | USGS
“AVO raised the Aviation Color Code to Orange and the Alert Level to Watch yesterday in response to observations of a new lava dome in the summit crater of Cleveland Volcano . New observations from August 2 show that the lava dome has grown from about 40 meters (131 feet) to about 50 meters (164 feet) in diameter since July 29. Weak thermal anomalies were detected in satellite images
 last night and this morning which is consistent with slow dome growth or a cooling dome.”

Active Volcanoes Eyed by Satellite

Natural-color image of the Puyehue-Cordon Caulle Volcanic Complex in Chile captured by NASA's Earth Observing-1 satellite on July 31. (NASA)

Two volcanoes have been imaged by the Advanced Land Imager (ALI) on NASA’s Earth Observing-1 (EO-1) satellite.

Puyehue-Cordón Caulle in Chile, which began erupting on June 4, continues to send out ash into the atmosphere.

ALI captured a picture of the volcano on July 31 with a pale ash plume rising, shadowing the lava flow beneath, during a minor eruption. Ground cameras showed the eruption column reached one mile (two kilometers) in height.

South of the plume in this image, areas free of lava are covered with a branching pattern of white snow and brown ash.

Natural-color image of Anak Krakatau in Indonesia captured by NASA's Earth Observing-1 satellite on July 31. (NASA)
On the same day, the satellite acquired an image of Anak Krakatau in the Sunda Strait in Indonesia, showing a thin plume of ash drifting westwards.The name of this little volcano literally means "Son of Krakatoa," and was the site of one of the biggest eruptions in the 19th century.Dark gray areas on the island mostly comprise lava flows from the 1970s through to the 1990s, and vegetation is growing on the older flows along the eastern side.

Contributing sources: 

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