Raususan, also known as Mendeleev, is a low compound stratovolcano located in the southern part of Kunashir Island. The dominantly andesitic-dacitic volcano is cut by two nested calderas, the larger 6-7 km in diameter and the smaller 3-3.5 km. A central cone that formed inside the younger caldera was breached to the west by a large debris avalanche about 4200 years ago. A lava dome that grew inside the avalanche scarp forms the 888 m high point of the volcano. Additional lava domes in the northern part of the older caldera are considered to represent flank activity of the younger caldera. The only unambiguous historical eruption was a small phreatic explosion in 1880. Four solfatara fields lie at the eastern and northern flanks of the central cone, and a geothermal field is located outside the caldera along the eastern coast.
Mendeleev volcano on the southern part of Kunashir Island towers above the village of Yuzhno-Kurilsk. Steam plumes rise above geothermal wells on the volcano's NW flanks, in one of several geothermal fields flanking the volcano. The volcano seen here lies within a 6-7 km wide caldera. The only unambiguous historical eruption from Mendeleev was a small phreatic explosion in 1880.
Photo by Alexander Rybin, 2001 (Institute of Marine Geology and Geophysics, Yuzhno-Sakhalin).
Last updated 2019-08-04 00:28:03