BackgroundKita-Yatsugatake (North Yatsugatake) is a group of stratovolcanoes and lava domes at the NW end of the NNW-SSE-trending Yatsugatake volcanic massif. The basaltic-to-dacitic Kita Yatsugatake volcanic group contains the Tateshina, Yokodake, Shimagareyama, Chausuyama and Futagomine volcanoes.
Tateshinayama is sometimes known as Suwa Fuji because of its conical profile. A large lava flow forms the Tateshina-kogen plateau south of Tateshina and Yoko-dake volcanoes. A debris avalanche from edifice collapse in 888 AD created Matsubara Lake on the east side of the massif. Yokodake lava dome, capped by eight small craters, has been active into the Holocene. The most recent eruption took place about 800 years ago, when ash emission accompanied emplacement of a small lava flow.
(from: Smithsonian / GVP volcano information)
See also: Sentinel hub | Landsat 8 | NASA FIRMS