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Rasshua

Stratovolcano · Russia · 956m

The roughly 6.5 x 15 km Rasshua island has a volcanic edifice largely filling a caldera in the center, shown in this September 2019 Planet Labs satellite image monthly mosaic (N is at the top). The edifice comprises three main cones and the southern rim is visible south of the two lakes.
The roughly 6.5 x 15 km Rasshua island has a volcanic edifice largely filling a caldera in the center, shown in this September 2019 Planet Labs satellite image monthly mosaic (N is at the top). The edifice comprises three main cones and the southern rim is visible south of the two lakes. · Photo: Satellite image courtesy of Planet Labs Inc., 2019 (https://www.planet.com/). · Wikimedia Commons
Type
Stratovolcano
Country
Russia
Region
Northwestern Pacific Volcanic Regions / Kuril Volcanic Arc
Elevation
956m
Coordinates
47.770, 153.020
Last eruption
1957
Tectonic setting
Subduction zone / Oceanic crust (< 15 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

The elongated 6 x 13 km island of Rasshua in the central Kuriles contains three overlapping central cones within a 6 km caldera whose eastern margin is beyond the shoreline. An eroded central cone was constructed during the late Pleistocene, along with an isolated cone near the NW coast. Two Holocene cones were built within the crater of the central cone. The westernmost forms the 956 m high point of the island and is the source of lava flows that flooded the crater floor and descended to the coast. The easternmost cone, active during historical time, is truncated by a 500-m-wide crater that is breached to the SE. This crater may have formed during a violent eruption in 1846. The only other known historical eruption produced weak explosions in 1957. Fumarolic activity continues in the eastern crater and in the saddle between the two summit cones.

From Wikipedia

Rasshua is an uninhabited volcanic island near the center of the Kuril Islands chain in the Sea of Okhotsk in the northwest Pacific Ocean, 16 kilometres (9.9 mi) from Ushishir and 30 kilometres (19 mi) southwest of Matua. Its name is derived from the Ainu language for “fur coat”, "Rushu o a" (ルシュ・オ・ア), or "abundant furs", "Rushi o a" (ルシ・オ・ア).

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
1846~1857 · 1 eruptions · max VEI 31946~1957 · 1 eruptions · max VEI 118461868190219241946

Detailed timeline

  1. 1957VEI 1Observed
    1957-10-16 – Ongoing
  2. 1846VEI 3Observed
    1846 – Ongoing
    Eastern cone ?

External links

⚠ For reference only. Not for emergency response.