Hakone volcan

Mise à jour: 18 août. 2022 11:00 GMT - Refresh
volcan complexe 1438 m / 4,718 ft
Honshu (Japon), 35.23°N / 139.02°E
Condition actuelle: normal / en sommeil (1 sur 5)
Last update: 12 déc. 2021 (Smithsonian / USGS Weekly Volcanic Activity Report)

Hakone (Hakoneyama) 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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Style éruptif tipique: phreatic explosions
Eruptions du volcan Hakone: 1170 AD ± 100 years (radiocarbon dated), 50 BC (?), 1050 BC (?), 1200 BC (?), 1400 BC ± 100 years, 3700 BC ± 100 years, 6000 BC ± 100 years
Derniers séismes proches: No recent earthquakes

Introduction

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 essaim sismique
Le 22 avril 1991, 300 séismes ont été enregistrés 5 km sous la partie centrale de la caldeira, mais aucune éruption a suivi.

See also: Sentinel hub | Landsat 8 | NASA FIRMS
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