Onikobe

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Onikobe volcano

caldera 769 m / 2,523 ft
Honshu, Japan, 38.83°N / 140.7°E
Current status: (probably) extinct (0 out of 5)

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Typical eruption style: explosive
Onikobe volcano eruptions: about 200,000 years ago
Last earthquakes nearby:

Time	Mag. / Depth	Distance	Location
Sun, 19 May
Sun, 19 May 13:33 UTC	M 0.8 / 10 km	18 km	岩手県内陸南部 (Iwate Pref.)
Sun, 19 May 10:01 UTC	M 0.5 / 6 km	9 km	岩手県内陸南部 (Iwate Pref.)
Sun, 19 May 08:10 UTC	M 1 / 8 km	14 km	岩手県内陸南部 (Iwate Pref.)
Sun, 19 May 07:24 UTC	M 0.8 / 6 km	7 km	宮城県北部 (Miyagi pref.)
Sun, 19 May 06:10 UTC	M 0.6 / 8 km	7 km	宮城県北部 (Miyagi pref.)

View all recent quakes

Onikobe volcano is a caldera SW of Kurikoma volcano in northern Honshu, Japan. It is probably extinct, but there are prominent geysers and hot springs in the caldera, known since about 1700 years ago.
In 1938 a new geyser (Benten geyser, or generally called Onikobe geyser) formed at a site where local residents had dug a borehole to create an onsen (hot spring).

Background:

Takahinata is a lava dome was last active about 350,000 years ago according to a fission-track date. Onikobe itself was active until about 200,00 years ago.
The caldera of Onikobe is one of the few calderas in Japan that show the classic pattern of ring fractures and a resurgent dome.
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Sources:
- GVP
- Nishimura, T., et al (2006) "Investigation of the Onikobe geyser, NE Japan, by observing the ground tilt and flow parameters", Earth Planets Space, 58, e21–e24 (eLetter)
- Nomura, J., and Arii, K. (1940) "Study on the new Fukiage geyser of Onikobe
Benten I", Current news of Saito-Hoonkai, No. 168, 1–19

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