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Maly Semyachik

Caldera · Russia · 1527m

Maly Semiachik is located within several nested Pleistocene calderas and composed of three overlapping edifices along a NE-SW line. Activity migrated to the SW, eventually forming the youngest cone, Ceno-Semiachik. It contains the historically active Troitsky crater, which formed during an explosive eruption about 400 years ago. It contains a hot, acidic lake this 1972 photo.
Maly Semiachik is located within several nested Pleistocene calderas and composed of three overlapping edifices along a NE-SW line. Activity migrated to the SW, eventually forming the youngest cone, Ceno-Semiachik. It contains the historically active Troitsky crater, which formed during an explosive eruption about 400 years ago. It contains a hot, acidic lake this 1972 photo. · Photo: Photo by Oleg Volynets, 1972 (Institute of Volcanology, Petropavlovsk). · Wikimedia Commons
Type
Caldera
Country
Russia
Region
Northwestern Pacific Volcanic Regions / Eastern Kamchatka Volcanic Arc
Elevation
1527m
Coordinates
54.135, 159.674
Last eruption
1952
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Basalt / Picro-Basalt
Geological summary

Maly Semyachik is a compound stratovolcano located in a 10-km-wide caldera within the 15 x 20 km mid-Pleistocene Stena-Soboliny caldera. Following construction during the late Pleistocene of the Paleo-Semiachik volcano beginning about 20,000 years before present (BP), activity migrated to the SW, forming Meso-Semiachik (about 11,000-9,000 BP) and Ceno-Semiachik (about 8,000 BP to the present). An initial stage lasting about 3,500 years was dominantly explosive, constructing the present cone. A second stage beginning about 4,400 years ago was marked by alternating constructive and destructive processes. A crater lake fills the historically active Troitsky Crater, which formed during a large explosive eruption about 400 years ago.

From Wikipedia

Maly Semyachik is a stratovolcano located in the eastern part of Kamchatka Peninsula, Russia. It is a compound stratovolcano located in a 10-km-wide caldera within the 15×20-km mid-Pleistocene Stena-Soboliny caldera. Three overlapping stratovolcanoes were constructed sequentially along a NE-SW line, with the youngest cone, Tseno-Semyachik, at the southwest end. A hot, acidic crater lake fills the historically active Troitsky Crater, which formed during a large explosive eruption of Ceno-Semiachik about 400 years ago.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
7550 BCE~7233 BCE · 1 eruptions · max VEI ?7233 BCE~6917 BCE · 1 eruptions · max VEI ?6283 BCE~5966 BCE · 1 eruptions · max VEI ?5966 BCE~5650 BCE · 2 eruptions · max VEI ?5650 BCE~5333 BCE · 1 eruptions · max VEI ?5333 BCE~5016 BCE · 1 eruptions · max VEI ?4699 BCE~4383 BCE · 2 eruptions · max VEI ?3749 BCE~3432 BCE · 1 eruptions · max VEI ?2482 BCE~2166 BCE · 2 eruptions · max VEI ?1849 BCE~1532 BCE · 1 eruptions · max VEI ?899 BCE~582 BCE · 2 eruptions · max VEI ?582 BCE~265 BCE · 1 eruptions · max VEI ?1319~1635 · 2 eruptions · max VEI 41635~1952 · 5 eruptions · max VEI 37550 BCE5333 BCE2799 BCE582 BCE1635

Detailed timeline

  1. 1952VEI 2Observed
    1952-12-05 – Ongoing
    Ceno-Semiachik (Toitsky Crater)
  2. 1945VEI 2Observed
    1945-09 – 1946-04-15
    Ceno-Semiachik (Toitsky Crater)
  3. 1852VEI 2Observed
    1852-04-15 – 1852-07
    Ceno-Semiachik (Troitsky Crater)
  4. 1851VEI 2Observed
    1851-09 – Ongoing
    Ceno-Semiachik (Troitsky Crater)
  5. 1804VEI 3Observed
    1804 – Ongoing
    Ceno-Semiachik (Troitsky Crater)
  6. 1550VEI 4Geological estimate
    1550 – Ongoing
    Ceno-Semiachik (Crater VI--Troitsky)
  7. 1400 (±50 yrs)VEI ?Geological estimate
    1400 – Ongoing
    Ceno-Semiachik (Crater V)
  8. 550 BCEVEI ?Geological estimate
    BCE 550 – Ongoing
    Ceno-Semiachik
  9. 650 BCEVEI ?Geological estimate
    BCE 650 – Ongoing
    Ceno-Semiachik
  10. 850 BCEVEI ?Geological estimate
    BCE 850 – Ongoing
    Ceno-Semiachik
  11. 1800 BCE (±50 yrs)VEI ?Geological estimate
    BCE 1800 – Ongoing
    Ceno-Semiachik (SW flank)
  12. 2250 BCEVEI ?Geological estimate
    BCE 2250 – Ongoing
    Ceno-Semiachik
  13. 2450 BCEVEI ?Geological estimate
    BCE 2450 – Ongoing
    Ceno-Semiachik (Crater IV)
  14. 3500 BCE (±50 yrs)VEI ?Geological estimate
    BCE 3500 – Ongoing
    Ceno-Semiachik flank (Obmanuvshy)
  15. 4500 BCE (±50 yrs)VEI ?Geological estimate
    BCE 4500 – Ongoing
    Ceno-Semiachik flank (Yushny cone)
  16. 4650 BCEVEI ?Geological estimate
    BCE 4650 – Ongoing
    Ceno-Semiachik
  17. 5050 BCEVEI ?Geological estimate
    BCE 5050 – Ongoing
    Ceno-Semiachik
  18. 5450 BCEVEI ?Geological estimate
    BCE 5450 – Ongoing
    Ceno-Semiachik
  19. 5750 BCEVEI ?Geological estimate
    BCE 5750 – Ongoing
    Ceno-Semiachik
  20. 5850 BCEVEI ?Geological estimate
    BCE 5850 – Ongoing
    Ceno-Semiachik
  21. 6150 BCEVEI ?Geological estimate
    BCE 6150 – Ongoing
    Ceno-Semiachik
  22. 6950 BCEVEI ?Geological estimate
    BCE 6950 – Ongoing
    Meso-Semiachik east flank (Vostochny)
  23. 7550 BCEVEI ?Geological estimate
    BCE 7550 – Ongoing
    Meso-Semiachik

External links

⚠ For reference only. Not for emergency response.