An unnamed undersea volcano, located about 1 kilometer (half a mile) off the southern coast of Iwo Jima, which Japan calls Ioto, started its latest series of eruptions on Oct. 21. (Kyodo News via AP) ...

Mount Ontake, about 210 kilometres west of Tokyo, sits on the border of Nagano and Gifu prefectures, on the main Japanese island of Honshu. The volcano’s last major eruption was in 1979.

Japan has 111 active volcanoes, with the majority of them located around the Pacific Ring of Fire. The construction of new islands as a result of undersea volcanoes and seismic activity is not ...

The volcano is only 2.5 miles across the bay from the city of Kagoshima, which has a population of nearly 600,000. Japan is one of the most seismically active nations in the world and sits on the ...