The Volcano Adventure Guide: Excellent information and background for anyone wishing to visit active volcanoes safely and enjoyably. The book presents guidelines to visiting 42 different volcanoes around the world.
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).
Volcanoes in the Solar System: The Earth is not the only place with volcanic activity. Active volcanism also occurs at at least 3 other bodies in our Solar System.
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