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Mount Azuma-kofuji

Azumayama

Stratovolcano · Japan · 1949m

The Azuma Kofuji cone with its 300-m-wide crater is one of many volcanic features of the Azumayama complex. This volcano group consists of a cluster of cones and lava domes. Volcanic activity has migrated to the E, with the Higashi-Azuma volcano group being the youngest. This photo was taken from the NW on the flanks of Issaikyoyama, which has been the site of historical eruptions (mostly small phreatic explosions).
The Azuma Kofuji cone with its 300-m-wide crater is one of many volcanic features of the Azumayama complex. This volcano group consists of a cluster of cones and lava domes. Volcanic activity has migrated to the E, with the Higashi-Azuma volcano group being the youngest. This photo was taken from the NW on the flanks of Issaikyoyama, which has been the site of historical eruptions (mostly small phreatic explosions). · Photo: Photo by Lee Siebert, 1988 (Smithsonian Institution). · Wikimedia Commons
Type
Stratovolcano
Country
Japan
Region
Northwestern Pacific Volcanic Regions / Northeast Japan Volcanic Arc
Elevation
1949m
Coordinates
37.735, 140.244
Last eruption
1977
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

The Azumayama volcanic group consists of a cluster of stratovolcanoes, shield volcanoes, lava domes, and pyroclastic cones. The andesitic and basaltic complex was constructed in two E-W rows above a relatively high basement of Tertiary sedimentary rocks and granodiorites west of Fukushima city. Volcanic activity has migrated to the east, with the Higashi-Azuma volcano group being the youngest. The symmetrical Azuma-Kofuji crater and a nearby fumarolic area on the flank of Issaikyo volcano are popular tourist destinations. The Azumayama complex contains several crater lakes, including Goshikinuma and Okenuma. Historical eruptions, mostly small phreatic explosions, have been restricted to Issaikyo volcano at the northern end of the Higashiyama group.

From Wikipedia

Mount Azuma-kofuji (吾妻小富士) is an active stratovolcano in Fukushima prefecture, Japan.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
5700 BCE~5444 BCE · 1 eruptions · max VEI 25444 BCE~5188 BCE · 1 eruptions · max VEI 14676 BCE~4420 BCE · 1 eruptions · max VEI ?4165 BCE~3909 BCE · 1 eruptions · max VEI 33141 BCE~2885 BCE · 1 eruptions · max VEI 12885 BCE~2629 BCE · 1 eruptions · max VEI ?1861 BCE~1606 BCE · 1 eruptions · max VEI ?1094 BCE~838 BCE · 1 eruptions · max VEI ?326 BCE~70 BCE · 1 eruptions · max VEI ?442~698 · 1 eruptions · max VEI ?1209~1465 · 1 eruptions · max VEI 11465~1721 · 1 eruptions · max VEI 11721~1977 · 12 eruptions · max VEI 15700 BCE3909 BCE1861 BCE70 BCE1721

Detailed timeline

  1. 1977VEI 1Observed
    1977-12-07 – 1977-12-07
    Issaikyo (Oana)
  2. 1966VEI 1Geological estimate
    1966-05-16 – 1966-08-16
    Issaikyo (Oana)
  3. 1952VEI 1Geological estimate
    1952-06-18 – Ongoing
    Issaikyo
  4. 1950VEI 1Observed
    1950-02-10 – 1950-02-19
    Issaikyo (Oana and NW of Oana)
  5. 1914VEI 1Geological estimate
    1914-11-12 – 1914-11-14
    Issaikyo
  6. 1896VEI 1Geological estimate
    1896-09-05 – 1896-09-19
  7. 1895VEI 1Observed
    1895-03-08 – 1895-09-13
    Issaikyo (near Oana)
  8. 1894VEI 1Observed
    1894-03-16 – 1894-04-12
    Issaikyo (near Oana)
  9. 1893VEI 1Observed
    1893-05-19 – 1893-07-13
    Issaikyo (west of Oana)
  10. 1893VEI 1Observed
    1893-11-09 – 1893-11-10
    Issaikyo
  11. 1844VEI 1Geological estimate
    1844 – Ongoing
    Issaikyo (Oana)
  12. 1800VEI ?Observed
    1800 – Ongoing
    Issaikyo (Oana)
  13. 1711VEI 1Observed
    1711 – Ongoing
    Issaikyo (Oana area)
  14. 1331VEI 1Observed
    1331 – Ongoing
    Issaikyo
  15. 600 (±200 yrs)VEI ?Geological estimate
    600 – Ongoing
  16. 150 BCE (±200 yrs)VEI ?Geological estimate
    BCE 150 – Ongoing
    Issaikyo
  17. 950 BCE (±100 yrs)VEI ?Geological estimate
    BCE 950 – Ongoing
    Issaikyo
  18. 1800 BCE (±50 yrs)VEI ?Geological estimate
    BCE 1800 – Ongoing
    Issaikyo
  19. 2750 BCE (±200 yrs)VEI ?Geological estimate
    BCE 2750 – Ongoing
    Issaikyo
  20. 3000 BCE (±50 yrs)VEI 1Geological estimate
    BCE 3000 – Ongoing
    Issaikyo
  21. 4150 BCE (±500 yrs)VEI 3Geological estimate
    BCE 4150 – Ongoing
    Azuma Ko-Fuji
  22. 4550 BCE (±1000 yrs)VEI ?Geological estimate
    BCE 4550 – Ongoing
    Issaikyo-Minami
  23. 5400 BCE (±200 yrs)VEI 1Geological estimate
    BCE 5400 – Ongoing
    Goshiki-numa
  24. 5700 BCE (±50 yrs)VEI 2Geological estimate
    BCE 5700 – Ongoing
    Oke-numa

External links

⚠ For reference only. Not for emergency response.