No, Mount Fuji is not a supervolcano, which is simply a volcano that has erupted with an explosivity index of at least 8. An eruption of this size has not occurred in recorded history, likely last occurring in New Zealand about 26,000 years ago.
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Geological CharacteristicsMt. Fuji has a composite structure due to multiple accumulations of lava, lapilli, and ash from repeated eruptions. It is unique that Mt. Fuji's volcanic product is basalt, given that most other Japanese volcanoes are made of andesite.
Volcanoes that have produced exceedingly voluminous pyroclastic eruptions and formed large calderas in the past 2 million years include Yellowstone in northwest Wyoming, Long Valley in eastern California, Toba in Indonesia, and Taupo in New Zealand.
Rising gradually to more than 4 km (2.5 mi) above sea level, Hawaii's Mauna Loa is the largest active volcano on our planet. Its submarine flanks descend to the sea floor an additional 5 km (3 mi), and the sea floor in turn is depressed by Mauna Loa's great mass another 8 km (5 mi).