Aso (Japan)

Status Unknown Eruption 2019 1592m
Caldera (Subduction zone / Continental crust (> 25 km))

Aso

The 24-km-wide Asosan 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 km3 of airfall tephra and pyroclastic-flow deposits. A group of 17 central cones was constructed in the middle of the caldera, one of which, Nakadake, is one of Japan's most active volcanoes. It was the location of Japan's first documented historical eruption in 553 CE. The Nakadake 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 CE. Historical eruptions have largely consisted of basaltic to basaltic-andesite ash emission with periodic strombolian and phreatomagmatic activity. The summit crater of Nakadake is accessible by toll road and cable car, and is one of Kyushu's most popular tourist destinations.

The 24-km-wide Aso caldera was formed during four major explosive eruptions during the Pleistocene. These produced voluminous pyroclastic flows that swept over much of Kyushu. A group of 17 central cones, seen here from the ENE caldera rim, was constructed in the central part of the caldera. One of these, Naka-dake, is one of Japan's most active volcanoes, with historical eruptions dating back to 553 CE. The summit crater of Naka-dake is accessible by toll road and cable car, and is one of Kyushu's most popular tourist destinations.

Photo by Norm Banks, 1981 (U.S. Geological Survey).

Last updated 2019-08-25 06:30:04

Latest activity

ACTIVITY CONT. VA AT 20190825/0600Z FL060 EXTD E OBS VA DTG

Tokyo VAAC - 2019-08-25 06:05:00 UTC ()

ERUPTED AT 20190825/0230Z FL060 EXTD E OBS VA DTG

Tokyo VAAC - 2019-08-25 02:45:00 UTC ()

POSS ACTIVITY CONT. VA CLD UNKNOWN AT 20190823/0000Z

Tokyo VAAC - 2019-08-23 00:04:00 UTC ()

POSS ACTIVITY CONT. VA CLD UNKNOWN AT 20190822/1800Z

Tokyo VAAC - 2019-08-22 18:04:00 UTC ()

POSS ACTIVITY CONT. VA CLD UNKNOWN AT 20190822/1200Z

Tokyo VAAC - 2019-08-22 12:04:00 UTC ()

POSS ACTIVITY CONT. VA CLD UNKNOWN AT 20190822/0600Z

Tokyo VAAC - 2019-08-22 06:04:00 UTC ()

ACTIVITY CONT. VA AT 20190822/0000Z FL050 EXTD N OBS VA DTG

Tokyo VAAC - 2019-08-22 00:03:00 UTC ()

POSS ACTIVITY CONT. VA CLD UNKNOWN AT 20190821/1800Z

Tokyo VAAC - 2019-08-21 18:02:00 UTC ()

ACTIVITY CONT. VA AT 20190821/1200Z FL080 EXTD N OBS VA DTG

Tokyo VAAC - 2019-08-21 12:06:00 UTC ()

VA AT 20190821/1021Z 15NM NE OF KUE FL100 EXTD N REPORTED

Tokyo VAAC - 2019-08-21 10:57:00 UTC ()