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Myōjin-shō

Myojinsho

Caldera · Japan · 11 m

Steam emission from the blocky summit of a lava dome formed during a submarine eruption at the Beyonesu Rocks vent of the Myojinsho caldera in 1952. This 22 September photo was taken six days after the dome began to breach the sea surface. Later that day the eruption became highly explosive and the dome was destroyed. Three cycles of dome growth and destruction occurred until October 1953.
Steam emission from the blocky summit of a lava dome formed during a submarine eruption at the Beyonesu Rocks vent of the Myojinsho caldera in 1952. This 22 September photo was taken six days after the dome began to breach the sea surface. Later that day the eruption became highly explosive and the dome was destroyed. Three cycles of dome growth and destruction occurred until October 1953. · Foto: Photo courtesy of Helen Foster, 1952 (U.S. Geological Survey). · Wikimedia Commons
Tipo
Caldera
Paese
Japan
Regione
Pacifico nord-occidentale / Izu Volcanic Arc
Altitudine
11 m
Coordinate
31.888, 139.918
Ultima eruzione
1970
Contesto tettonico
Subduction zone / Oceanic crust (< 15 km)
Forma vulcanica
Caldera
Roccia principale
Dacite
Sintesi geologica

Beyonesu Rocks are part of the barely exposed rim of the largely submarine Myojinsho caldera. Formation of the 8-9 km wide caldera was followed by construction of a large (2.6 km3) lava dome and/or lava flow complex on the caldera floor, originally located at a depth of 1,000-1,100 m. Most eruptions recorded since the late-19th century have occurred from the dacitic post-caldera Myojinsho lava dome on the NE caldera rim. Deposits from submarine pyroclastic flows associated with growth of the dome cover it and extend both into the NE part of the caldera and down its outer slopes. An explosive submarine eruption from Myojinsho in 1952 destroyed a Japanese research vessel, killing all 31 on board. Submarine eruptions have also been observed from other points on the caldera rim and outside of the caldera. The Beyonesu Rocks were named after the French warship the Bayonnaise, which was surveying volcanic islands south of Tokyo Bay in 1850.

Sintesi da Wikipedia

Riassunto in inglese

Myōjin-shō (明神礁) is a submarine volcano located about 450 kilometers south of Tokyo on the Izu-Ogasawara Ridge in the Izu Islands. Volcanic activity has been detected there since 1869. Since then it has undergone more eruptions, the most powerful of which resulted in the appearance and disappearance of a small island.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
1869~1884 · 2 eruzioni · VEI max. 01884~1900 · 1 eruzioni · VEI max. 21900~1915 · 2 eruzioni · VEI max. 11931~1946 · 1 eruzioni · VEI max. 01946~1961 · 8 eruzioni · VEI max. 21961~1977 · 2 eruzioni · VEI max. 21977~1992 · 7 eruzioni · VEI max. 02008~2023 · 2 eruzioni · VEI max. ?18691900194619772008

Cronologia dettagliata

  1. 2023VEI ?Osservata
    2023-01-26 – 2023-01-26
  2. 2018VEI ?Osservata
    2018-03-24 – 2018-03-24
  3. 1988VEI 0Stima geologica
    1988-03-18 – 1988-03-19
    Myojinsho
  4. 1987VEI 0Stima geologica
    1987-10-21 – 1987-12-09
    Myojinsho
  5. 1986VEI 0Stima geologica
    1986-10-24 – 1986-10-24
    Myojinsho
  6. 1983VEI 0Stima geologica
    1983-05-12 – In corso
    Myojinsho
  7. 1982VEI 0Stima geologica
    1982-08-10 – In corso
    Myojinsho
  8. 1980VEI 0Stima geologica
    1980-11-15 – 1980-12-23
    Myojinsho
  9. 1979VEI 0Stima geologica
    1979-07-13 – In corso
    Myojinsho
  10. 1971VEI 0Stima geologica
    1971-03-18 – In corso
  11. 1970VEI 2Osservata
    1970-01-29 – 1970-06-16
    Myojinsho
  12. 1960VEI 2Osservata
    1960-07-21 – In corso
    Myojinsho
  13. 1959VEI 0Osservata
    1959-07-02 – In corso
  14. 1958VEI 0Osservata
    1958-07-02 – In corso
  15. 1957VEI 0Osservata
    1957-05-02 – In corso
  16. 1955VEI 0Osservata
    1955-06-25 – In corso
    4 km north of Bayonnaise Rocks
  17. 1954VEI 0Osservata
    1954-11-04 – 1954-11-05
    Myojinsho
  18. 1952VEI 2Osservata
    1952-09-16 – 1953-10-16
    Myojinsho
  19. 1946VEI 2Osservata
    1946-02-04 – In corso
    Island at 31.95 N 140.02 E
  20. 1934VEI 0Osservata
    1934-05-16 – In corso
    9 km E of Bayonnaise Rocks
  21. 1915VEI 0Osservata
    1915-02-16 – 1915-07-16
    11 km east, 19 km NE, 4 km SW
  22. 1906VEI 1Osservata
    1906-04-07 – 1906-04-14
    9-15 km SE of Bayonnaise Rocks
  23. 1896VEI 2Osservata
    1896-07-02 – In corso
    14 km north of Bayonnaise Rocks
  24. 1871VEI 0Stima geologica
    1871-07-02 – In corso
    Volcano Uncertain
  25. 1869VEI 0Stima geologica
    1869-05-06 – In corso
    Volcano Uncertain

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