© Asahi Shimbun file photoMount Fuji, Japan's most famous volcano.
Japan should brace for a catastrophic volcanic eruption at some point, say experts, citing a massive buildup of magma at many of the nation's 110 active volcanoes. The last particularly serious eruption in Japan occurred in 1914, when Mount Sakurajima in southern Kagoshima Prefecture blew its top. According to study by volcanologists, Japan, which lies on the Pacific Rim of Fire, has been shaken by more than 1,000 volcanic eruptions over the past 2,000 years.
"The possibility of a major eruption in the future is real," said Yoichi Nakamura, a professor of volcanology at Utsunomiya University who has been analyzing volcanic eruptions with a team of researchers.
To be classified as active, a volcano must have erupted within the past 10,000 years or still be spewing gases, according to the Japan Meteorological Agency.
The active volcanoes include sites in the disputed Northern Territories off northeastern Hokkaido as well as undersea volcanoes.
Of the 110 active volcanoes, the agency monitors activity of the 47 around the clock to detect signs of an imminent eruption.