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Zufallsfotos
News
Mittwoch, Jul 01, 2015
Following a small explosion in the Owakudani hydrothermal area and increased seismic activity, the alert level of the volcano was raised to 3 (on a scale of 1-5) on 30 June. ... [mehr]
Deformation at Hakone volcano (Owakudani valley in circle) during 7-21 May based on interference SAR data (GSI)
Freitag, Mai 22, 2015
Unrest at the Owakudani valley continues. Fumarolic activity has increased drastically. Ground has lifted by up to 15 cm during 7-21 May, or up to 20 cm when compared to early October last year. [mehr]
 

Hakone Vulkan

komplexer Vulkan 1438 m / 4,718 ft
Honshu, Japan, 35.23°N / 139.02°E
Aktueller Status: unruhig (2 von 5)
Hakone Webcams / aktuelle Daten
Hakone volcano books
Last update: 1 Jul 2015
Typische Aktivität: phreatic explosions
Ausbrüche des Hakone: 1170 AD ± 100 years (radiocarbon dated), 50 BC (?), 1050 BC (?), 1200 BC (?), 1400 BC ± 100 years, 3700 BC ± 100 years, 6000 BC ± 100 yearsNo recent earthquakes
UhrzeitMag. / TiefeDistanceOrt
Hakone volcano is located 80 km SW of Tokyo. It is a massive stratovolcano truncated by 2 overlapping calderas, the largest being 11 x 10 km wide. It contains several younger vents, mostly lava domes, on a SW-NE trend cutting through the center of the caldera. The Kami-yama stratovolcano, the youngest of these, forms the high point of the volcano.
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 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. Ōwakudani (大涌谷, lit. "Great Boiling Valley") is a valley with intense hydrothermal activity and the location of several phreatic explosions in the past.
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.

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