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Deformation at Hakone volcano (Owakudani valley in circle) during 7-21 May based on interference SAR data (GSI)
Friday, May 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. [more]
Earthquakes under Hakone volcano (JMA)
Thursday, May 07, 2015
An eruption warning has been declared for the volcano, as increased seismic activity under the Ōwakudani hydrothermal field were registered during the past days and could herald sudden phreatic explosions. ... [more]

Hakone volcano eruptions

complex volcano 1438 m / 4,718 ft
Honshu, Japan, 35.23°N / 139.02°E
Eruption list: 1170 AD ± 100 years (radiocarbon dated), 50 BC (?), 1050 BC (?), 1200 BC (?), 1400 BC ± 100 years, 3700 BC ± 100 years, 6000 BC ± 100 years


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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