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Monte Kusatsu-Shirane

Kusatsu-Shiranesan

Stratovulcano · Japan · 2165 m

The summit of Kusatsu-Shiranesan contains three craters with the largest, Yugama, holding the turquoise lake shown here. Rafts of yellow sulfur float on the surface of the acidic lake. This 1977 view looks across the lake from the SW-most crater (Karagama) to the NE-most crater (Mizugama), located beyond the notch to the left. Small-to-moderate phreatic explosions have been recorded from all three craters since the 1800s.
The summit of Kusatsu-Shiranesan contains three craters with the largest, Yugama, holding the turquoise lake shown here. Rafts of yellow sulfur float on the surface of the acidic lake. This 1977 view looks across the lake from the SW-most crater (Karagama) to the NE-most crater (Mizugama), located beyond the notch to the left. Small-to-moderate phreatic explosions have been recorded from all three craters since the 1800s. · Foto: Photo by Lee Siebert, 1977 (Smithsonian Institution). · Wikimedia Commons
Tipo
Stratovulcano
Paese
Japan
Regione
Northwestern Pacific Volcanic Regions / Northeast Japan Volcanic Arc
Altitudine
2165 m
Coordinate
36.618, 138.528
Ultima eruzione
2018
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

The Kusatsu-Shiranesan complex, located immediately north of Asama volcano, consists of a series of overlapping pyroclastic cones and three crater lakes. The andesitic-to-dacitic volcano was formed in three eruptive stages beginning in the early to mid-Pleistocene. The Pleistocene Oshi pyroclastic flow produced extensive welded tuffs and non-welded pumice that covers much of the E, S, and SW flanks. The latest eruptive stage began about 14,000 years ago. Historical eruptions have consisted of phreatic explosions from the acidic crater lakes or their margins. Fumaroles and hot springs that dot the flanks have strongly acidified many rivers draining from the volcano. The crater was the site of active sulfur mining for many years during the 19th and 20th centuries.

Sintesi da Wikipedia

Riassunto in inglese

Mount Kusatsu-Shirane is a 2,165 m (7,103 ft) active stratovolcano in Kusatsu, Gunma, Japan. It is called Kusatsu Shirane to differentiate it from the Mount Nikkō-Shirane on the other side of Gunma Prefecture. The summit of Kusatsu-Shirane volcano, located immediately north of Asama volcano, consists of a series of overlapping pyroclastic cones and three crater lakes. The largest of these is Yu-gama, an acidic emerald green lake with rafts of yellow sulfur sometimes seen floating on its surface.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
6550 BCE~6264 BCE · 2 eruzioni · VEI max. 33980 BCE~3694 BCE · 1 eruzioni · VEI max. 21124 BCE~838 BCE · 1 eruzioni · VEI max. 4552 BCE~267 BCE · 1 eruzioni · VEI max. 319~304 · 1 eruzioni · VEI max. 21447~1732 · 1 eruzioni · VEI max. ?1732~2018 · 24 eruzioni · VEI max. 36550 BCE4551 BCE2266 BCE267 BCE1732

Cronologia dettagliata

  1. 2018VEI 1Osservata
    2018-01-23 – 2018-01-23
    Motoshiranesan
  2. 1989VEI 1Stima geologica
    1989-01-06 – 1989-01-06
    NW part of Yu-gama
  3. 1983VEI 1Osservata
    1983-07-26 – 1983-12-21
    Yu-gama, Kara-gama
  4. 1982VEI 1Osservata
    1982-10-26 – 1982-12-29
    Kara-gama, Yu-gama
  5. 1976VEI 1Osservata
    1976-03-02 – 1976-03-02
    NE corner of Mizu-gama Crater
  6. 1958VEI 1Osservata
    1958-12-31 – In corso
    Yu-gama
  7. 1942VEI 1Osservata
    1942-02-02 – In corso
    Fissure east and south of Yu-gama
  8. 1941VEI 1Osservata
    1941-01-19 – 1941-01-19
  9. 1940VEI 1Osservata
    1940-04-07 – 1940-09-13
  10. 1939VEI 1Osservata
    1939-02 – 1939-08-28
    Yu-gama
  11. 1938VEI 1Osservata
    1938-07-17 – 1938-10-05
    Yu-gama
  12. 1937VEI 1Osservata
    1937-11-27 – 1938-02-16
    Yu-gama
  13. 1934VEI 2Osservata
    1934 – In corso
  14. 1933VEI ?Stima geologica
    1933 – In corso
  15. 1932VEI 3Osservata
    1932-10-01 – 1932-11
    NE part of Yu-gama, SE outer rim
  16. 1927VEI 2Osservata
    1927-12-29 – 1927-12-31
    N Yu-gama & S outer rim (in 1927, not 1928)
  17. 1925VEI 2Osservata
    1925-01-22 – 1925-01-30
    Northern part of Yu-gama
  18. 1905VEI 2Osservata
    1905-10 – 1905-10
    Yu-gama
  19. 1903VEI ?Stima geologica
    1903 – In corso
  20. 1902VEI 1Osservata
    1902-07-15 – 1902-09-24
    North side of Yumi-ike
  21. 1900VEI 1Osservata
    1900-10-01 – 1900-10-01
    NE part of Yu-gama
  22. 1897VEI 2Osservata
    1897-07-08 – 1897-08-16
    NE part of Yu-gama
  23. 1882VEI 2Osservata
    1882-08-06 – 1882-08-16
    Yu-gama, NE end of Kara-gama
  24. 1805VEI 2Osservata
    1805 – In corso
    Yu-gama
  25. 1470 (±150 anni)VEI ?Stima geologica
    1470 – In corso
  26. 50VEI 2Stima geologica
    50 – In corso
    Yu-gama
  27. 550 a.C.VEI 3Stima geologica
    BCE 550 – In corso
    Yu-gama
  28. 1120 a.C. (±150 anni)VEI 4Stima geologica
    BCE 1120 – In corso
    Moto-Shirane
  29. 3750 a.C.VEI 2Stima geologica
    BCE 3750 – In corso
    Shirane
  30. 6270 a.C. (±200 anni)VEI ?Stima geologica
    BCE 6270 – In corso
  31. 6550 a.C.VEI 3Stima geologica
    BCE 6550 – In corso
    Shirane

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