BackgroundOsore-yama contains a 5 km wide caldera partly filled by a shallow lake draining through the northern caldera wall.
Dissected lava domes ring the caldera floor. The andesitic-to-dacitic Osore-yama is largely Pleistocene in age, with activity dating back about 800,000 years. The last identified distal tephra deposit was erupted during the late Pleistocene. The only report of historical activity was in a Tohoku district travel document published in 1787, which stated that Yake-yama in Mutsu country (Osore-yama) had erupted.
(Source: Smithsonian / GVP volcano information)
See also: Sentinel hub | Landsat 8