Washiba-Kumonotaira volcano in the Northern Japan Alps is a group of small shield volcanoes and possible lava domes. The volcanoes are located in a remote part of the Chubu Sangaku National Park.
The last activity was from Washiba-ike volcano less than 12,000 years ago.
Intraplate volcanism: A third tectonic setting where volcanism occurs is believed to be the result of mantle plumes and not directly related to plate boundaries. So called hot spot volcanoes fall into this category.
Divergent plate boundaries in oceans: Two ocean plates move apart from each other. Hot upwelling mantle material forms magmas that continuously produce new oceanic crust. An ocean widens.
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