What is the most active volcano in Japan?

After Miocene, most caldera volcanoes disappeared while many stratovolcanoes were formed, because the stress fields changed their directions from NE and SW to east and west (1). Today, there are more than 80 historical volcanoes and 85 active volcanoes in Japan (2). read more

Mount Asama is the most active volcano on Japan's main island (Honshu). It sits just 145 kilometers from Tokyo in Gunma and Nagano prefectures. Mount Asama had a major eruption in 1783 that caused widespread damage and triggered major fires that destroyed vast areas of Japan. read more

The most active volcano in Japan, and one of the largest in the world is Mt Aso. It stands on the island of Kyushu. Aso also has one of the largest calderas in the world, indeed almost a caldera complex - the overall dimensions of the caldera are 25 km by 18 km with an estimated circumference of 120 km. read more