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Bolshoy Semyachik

Bolshoi Semiachik

Stratovolcano · Russia · 1720m

Bolshoi Semiachik is a group of late Pleistocene-Holocene cones and domes located within a large caldera. The massif is seen here from the western rim (Bort ridge). Bolshoi Semiachik volcano is the large late-Pleistocene edifice on the near the center of the horizon. Several Holocene extrusive domes and vigorously active thermal fields are located W and SW of the volcano.
Bolshoi Semiachik is a group of late Pleistocene-Holocene cones and domes located within a large caldera. The massif is seen here from the western rim (Bort ridge). Bolshoi Semiachik volcano is the large late-Pleistocene edifice on the near the center of the horizon. Several Holocene extrusive domes and vigorously active thermal fields are located W and SW of the volcano. · Photo: Copyrighted photo by Nikolai Smelov (Holocene Kamchataka volcanoes; http://www.kscnet.ru/ivs/volcanoes/holocene/main/main.htm).
Type
Stratovolcano
Country
Russia
Region
Northwestern Pacific Volcanic Regions / Eastern Kamchatka Volcanic Arc
Elevation
1720m
Coordinates
54.320, 160.020
Last eruption
-4450
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Basalt / Picro-Basalt
Geological summary

The Bolshoi Semiachik volcanic complex was constructed within a 10-km-wide caldera whose rim is exposed only on the west. The caldera occupies a large 20 x 30 km late-Pleistocene volcano-tectonic depression near the Pacific Coast of eastern Kamchatka. Post-caldera volcanism includes resurgent doming and the construction of numerous stratovolcanoes and lava domes, several of which have been active during the Holocene. Zubchatka (Bolshoi Semiachik), Zapadny Barany, Vostochny Barany, Zentralny Semiachik, Popkov, Plosky, and Burlyashchy volcanoes are the largest of the complex. The youngest volcanism and intense hydrothermal activity is located outside the caldera to the SE.

From Wikipedia

Bolshoy Semyachik is a volcano located in the eastern part of the Kamchatka Peninsula, Russia. It consists of a group of a few stratovolcanoes and lava domes.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
6800 BCE~6604 BCE · 1 eruptions · max VEI ?4646 BCE~4450 BCE · 1 eruptions · max VEI ?6800 BCE6212 BCE5625 BCE5233 BCE4646 BCE

Detailed timeline

  1. 4450 BCEVEI ?Geological estimate
    BCE 4450 – Ongoing
    Korona and Yezh lava domes
  2. 6800 BCE (±300 yrs)VEI ?Geological estimate
    BCE 6800 – Ongoing
    Ivanov lava dome

External links

⚠ For reference only. Not for emergency response.