"E-san, a small andesitic stratovolcano capped by a 618-m-high lava dome, is Hokkaido's southernmost active volcano. E-san occupies the eastern tip of the double-pronged Oshima Peninsula across the Tsugaru Strait from Honshu. Another lava dome is located to the NW. Both the E-san lava dome, which formed about 9000 years ago, and the NW dome have been active during the Holocene. A minor phreatic eruption in 1846 produced a mudflow that caused many fatalities. The latest activity at E-san was a small eruption in 1874. Active fumaroles occur at a thermal area on the upper NW flank."  -Smithsonian Volcano Archive
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