Hakone volcano

complex volcano 1438 m / 4,718 ft
Honshu, Japan, 35.23°N / 139.02°E
Current status: normal or dormant (1 out of 5)
Last update: 2 Oct 2018

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.

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Typical eruption style: phreatic explosions
Hakone volcano eruptions: 1170 AD ± 100 years (radiocarbon dated), 50 BC (?), 1050 BC (?), 1200 BC (?), 1400 BC ± 100 years, 3700 BC ± 100 years, 6000 BC ± 100 years

Latest nearby earthquakes

TimeMag. / DepthDistance/Location
Tue, 1 Jun 2021 (GMT) (2 earthquakes)
Jun 02, 2021 08:33:05.100 (1 Jun 2021 23:33:05 GMT)
2.5

163 km
18 km (11 mi)
North Pacific Ocean, 12 km south of Odawara, Kanagawa, Japan
Jun 01, 2021 22:55:49.25 (1 Jun 2021 13:55:49 GMT)
2.5

30 km
38 km (24 mi)
North Pacific Ocean, 25 km southwest of Kamakura, Kanagawa, Japan

Background

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.

See also: Sentinel hub | Landsat 8
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