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Grozny Ridge

Etorofu-Yakeyama [Grozny Group]

Complex volcano · Japan - administered by Russia · 1158m

The Yakeyama (Grozny) andesitic lava dome is seen from the N with lava flows descending into Lopasnoye lake in the foreground. The Etorofu-Yakeyama (Ivan Grozny) volcano group in central Iturup Island includes multiple Holocene lava domes.
The Yakeyama (Grozny) andesitic lava dome is seen from the N with lava flows descending into Lopasnoye lake in the foreground. The Etorofu-Yakeyama (Ivan Grozny) volcano group in central Iturup Island includes multiple Holocene lava domes. · Photo: Photo by A. Korablev, 1993 (Institute of Marine Geology and Geophysics, Yuzhno-Sakhalin). · Wikimedia Commons
Type
Complex volcano
Country
Japan - administered by Russia
Region
Northwestern Pacific Volcanic Regions / Kuril Volcanic Arc
Elevation
1158m
Coordinates
45.012, 147.871
Last eruption
2013
Tectonic setting
Subduction zone / Intermediate crust (15-25 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

The Etorofu-Yakeyama (Ivan Grozny) complex is located in the center of Iturup Island. It has a 3-3.5 km diameter caldera open to the south, where a 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. Recorded eruptions, the first of which took place in 1968, have been from the central Yakeyama (Grozny) dome.

From Wikipedia

Grozny Group is a complex volcano located in the central part of Iturup Island, Kuril Islands, controlled by Russia, and claimed by Japan.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
1968~1973 · 2 eruptions · max VEI 11973~1977 · 2 eruptions · max VEI 21986~1991 · 1 eruptions · max VEI 22009~2013 · 2 eruptions · max VEI 219681977199120002009

Detailed timeline

  1. 2013VEI 2Observed
    2013-02-16 – 2013-04-04
    Etorofu-Yake-yama / Ivan Grozny
  2. 2012VEI 2Observed
    2012-08-16 – 2012-08-25
    Etorofu-Yake-yama / Ivan Grozny
  3. 1989VEI 2Observed
    1989-05-03 – 1989-08-05
    Ivan Grozny
  4. 1973VEI 1Observed
    1973-01-16 – 1973-01-16
    Ivan Grozny
  5. 1973VEI 2Observed
    1973-05-16 – 1973-05-17
    Ivan Grozny (N flank of cent. dome)
  6. 1970VEI 1Observed
    1970-07-02 – Ongoing
    Ivan Grozny
  7. 1968VEI 1Observed
    1968-02-16 – 1968-02-16
    Ivan Grozny

External links

⚠ For reference only. Not for emergency response.