Etorofu-Yakeyama (Ivan Grozny), is located in the center of Iturup Island. It has a 3-3.5 km diameter caldera that is open to the south, where the large extrusive andesitic dome was emplaced. Several other lava domes of Holocene age were constructed to the NE; extrusion of these domes has constricted a former lake in the northern side of the caldera to an extremely sinuous shoreline. Historical eruptions, the first of which took place in 1968, have been restricted to Etorofu-Yakeyama.
The steep-sided Ivan Grozny lava dome is seen from the north with lava flows descending into Lopasnoye lake in the foreground. The Grozny volcano group in central Iturup Island contains the complex volcanoes of Ivan Grozny and Tebenkov. The forested Tebenkov volcano lies immediately to the NE of the Grozny dome complex. Historical eruptions, the first of which took place in 1968, have been restricted to Ivan Grozny.
Photo by A. Korablev, 1993 (Institute of Marine Geology and Geophysics, Yuzhno-Sakhalin).
Last updated 2019-08-04 00:28:03