Redoubt Activity - Color Code ORANGE : Alert Level WATCH
Alaska volcano 'more energetic,' scientists say
Mt. Redoubt volcano in Alaska still rumbling, but no eruption yet
The latest report on volatile Mt. Redoubt's status, from the Alaska Volcano Observatory website: "Unrest at Redoubt Volcano continues, though no eruption has yet occurred. Seismicity levels have risen within the last eight hours. Redoubt remains at Aviation Color Code ORANGE and Volcano Alert Level WATCH."
Feb. 2 (Bloomberg) -- Two volcanoes in Japan and another in eastern Russia erupted overnight, spreading ash as far as the Philippines and Vietnam, the Japan Meteorological Agency said on its Web site.
Seven minor eruptions occurred at Mount Sakurajima on Japan’s southern island of Kyushu, throwing rocks up to 2 kilometers, the agency said. Eruptions at Mount Asama in central Japan and Karymsky Volcano on the Russian peninsula of Kamchatka were also reported. There were no reports of damage or injuries.
“I woke up after midnight to the sound and shake of the eruption,” Daisuke Tanaka, 24, a convenience-store attendant, who lives about 20 kilometers away from Asama, said by telephone today. “The sound was as if an airplane was taking off nearby and it continued for 30 minutes.”
The eruptions occurred in a region where four tectonic plates, the Eurasian, Philippine, North American and Pacific, meet, causing seismic activity.
Japan has 108 active volcanoes representing about 10 percent of the world’s total. Forty-three people died in 1991 after Mount Unzen erupted on the southern island of Kyushu, while 15,000 people were evacuated after Mount Usu erupted on the northern island of Hokkaido in 2000.
The 2,568 meter Asama, which last had a minor eruption in August last year, is one of the most active volcanoes in Japan. A major eruption in 1783 killed more than 1,000 people.
The meteorological agency raised its alert levels for both Asama and Sakurajima, prohibiting people from entering the area around the volcano.
Submarine Eruption in the Tonga Islands
A submarine volcanic eruption occurred in the Tonga Islands of the South Pacific in mid-March 2009. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite captured this image of volcanic activity on March 18, 2009. In this image, the area around the eruption appears bright blue-green, likely resulting from sediment suspended in the water. The brilliant white patch at the center of the sediment-rich area may result from vapor released by the volcano. Northwest of the eruption site, a serpentine pumice raft floats on the water. The highly porous nature of pumice enables this volcanic rock to form floating rafts. (A larger pumice raft resulted from a similar eruption in the Tonga Islands in August 2006.)
The Tonga Islands occur along the Ring of Fire—a ring of heightened seismic activity in the Pacific Basin. According to a bulletin from the U.S. Air Force Weather Agency, this eruption was detected through a ground-based observation at Tonga Airport on Tongatapu Island on March 17, 2009.
Although the eruption appears unspectacular in this image, views from the ocean surface showed massive columns of volcanic ash and steam shooting 10 kilometers (6 miles) skyward, according to the Associated Press. The volcano did not, however, pose a danger to nearby islanders.