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Report on Etorofu-Yakeyama [Grozny Group] (Japan - administered by Russia) — 5 September-11 September 2012

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 5 September-11 September 2012
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2012. Report on Etorofu-Yakeyama [Grozny Group] (Japan - administered by Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 5 September-11 September 2012. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (5 September-11 September 2012)


Etorofu-Yakeyama [Grozny Group]

Japan - administered by Russia

45.012°N, 147.871°E; summit elev. 1158 m

All times are local (unless otherwise noted)


Based on visual observations and analyses of satellite imagery, SVERT reported that during 4-10 September fumarolic activity at Grozny Group increased. The Aviation Color Code remained at Yellow.

Geologic Background. 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.

Source: Sakhalin Volcanic Eruption Response Team (SVERT)