Freitag, Mär 01, 2013
The latest bulletin of the Japan Meteorological Agency mentions that an increase in seismicity since January 11 near the intra-caldera dome Komagatake is beginning to worry scientists about a possible new activity. ... [mehr]
Hakone VulkanHakone volcano is located 80 km SW of Tokyo. It contains 2 overlapping calderas, the largest being 11 x 10 km wide, and several younger lava domes aligned on a SW-NE trend cutting through the center of the calderas.
The calderas are breached to the east by the Haya-kawa canyon. The scenic Lake Ashi (Ashinoko) was created by a phreatic eruption 3000 yeas ago, which followed the collapse of the NW flank of the largest and youngest of the lava domes, Kami-yama, and dammed the Haya-kawa valley.
The last activity of Hakone volcano was ca. 800 years ago and consisted in phreatic explosions.
Lake Ashi and other major thermal areas in the caldera are a tourist destination SW of Tokyo.
Beschreibung:The Hakone volcano calderas were formed as a result of 2 major explosive eruptions about 180,000 and 49,000-60,000 years ago.
Dome growth after the caldera formation occurred progressively to the south. The , forms the high point of Hakone.
The latest magmatic eruption from Hakone was ca. 2900 years ago and produced a pyroclastic flow and a lava dome in the explosion crater. Phreatic eruptions have last occurred in the 12-13th centuries AD. Seismic swarms occurred at Hakone during the 20th century.
(Source: Smithsonian / GVP volcano information)
1991 seismic swarm
On 22 April 1991, 300 earthquakes were recorded 5 km beneath the central part of the caldera, but no eruption has followed.