Asama Volcano on the Japanese island of Honshu showed signs of unrest, including ash plumes and increased seismic activity, starting in late January 2009.
Composed of visible and infrared light, this image shows a relatively calm-looking Redoubt Volcano on May 5, 2009. The only visible sign of activity is a steam plume at the summit.
Acquired February 9, 2010, this image shows ocean water discolored by the submarine eruption of Fukutoku-Okanoba. The water affected by ash appears electric blue, in contrast to the surrounding navy blue water.
Lahars present an ongoing threat to those living around New Zealand’s Mount Ruapehu. On March 18, 2007, one such slurry burst out of Mount Ruapehu’s caldera and flowed down the side of the volcano.