Global Volcanism Program | Image GVP-05673
Esan volcano has lava dome at the eastern tip of the Oshima Peninsula. This is Hokkaido's southernmost active volcano and a minor phreatic eruption in 1846 produced a lahar that caused many fatalities. Active fumaroles are at a thermal area on the upper NW flank.
Photo by Ken-ichi Arai, 1996 (Hokkaido University).