jeudi, janv. 01, 1970
Mild explosive activity with ash emissions continue at Aso volcano, producing plumes rising to altitudes of 1.5-2.1 km (5,000-7,000 ft) a.s.l. A more violent explosion on 18 May sent a plume to 3 km (10,000 ft) altitude. [details]
Aso volcano on Kyushu Island, Japan, has become active again. Since Friday 13 May, the Nakadake vent of Aso has been producing small (phreatic) explosions with a 500 m (1,600 ft) tall steam-and-ash plume. ... [details]
Aso volcanAso volcano in central Kyushu Island in southwestern Japan is one of the world's most active volcanoes. In recent years, it has been the site of frequent ash eruptions.
Aso is no single edifice, but a complex of active vents in the center of a large 24 km wide caldera.
Introduction:The 24-km-wide Aso caldera was formed during four major explosive eruptions from 300,000 to 90,000 years ago. These produced voluminous pyroclastic flows that covered much of Kyushu. The last of these, the Aso-4 eruption, produced more than 600 cu km of airfall tephra and pyroclastic-flow deposits. A group of 17 central cones was constructed in the middle of the caldera, one of which, Naka-dake, is one of Japan's most active volcanoes. It was the location of Japan's first documented historical eruption in 553 AD. The Naka-dake complex has remained active throughout the Holocene. Several other cones have been active during the Holocene, including the Kometsuka scoria cone as recently as about 210 AD. Historical eruptions have largely consisted of basaltic to basaltic-andesite ash emission with periodic strombolian and phreatomagmatic activity. The summit crater of Naka-dake is accessible by toll road and cable car, and is one of Kyushu's most popular tourist destinations.
Source: GVP Aso volcano information
2 tourists were killed by volcanic gas 100 m south of the rim of Crater 1 on 23 November 1997. Since 1980, more than 70 people have been injured by volcanic gases at Aso and have been hospitalized.
3 people were killed and 11 injured by ballistic blocks ejected by an explosion that occurred at about 1pm local time on 6 September 1979.
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