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Monte Unzen

Unzendake

Vulcano complesso · Japan · 1483 m

The Unzen volcanic complex comprises much of the Shimabara Peninsula east of Nagasaki, seen here looking to the W from across Shimabara Bay. Three large edifices are visible: Kinugasa to the N, Fugendake in the E-center, and Kusenbu on the S. Historical eruptive activity has occurred at the summit and flanks of Fugendake. Activity during 1990-95 formed a lava dome at the summit that produced pyroclastic flows (block-and-ash flows).
The Unzen volcanic complex comprises much of the Shimabara Peninsula east of Nagasaki, seen here looking to the W from across Shimabara Bay. Three large edifices are visible: Kinugasa to the N, Fugendake in the E-center, and Kusenbu on the S. Historical eruptive activity has occurred at the summit and flanks of Fugendake. Activity during 1990-95 formed a lava dome at the summit that produced pyroclastic flows (block-and-ash flows). · Foto: Photo by Tom Casadevall, 1991 (U.S. Geological Survey). · Wikimedia Commons
Tipo
Vulcano complesso
Paese
Japan
Regione
Western Pacific Volcanic Regions / Nankai Volcanic Arc
Altitudine
1483 m
Coordinate
32.761, 130.299
Ultima eruzione
1996
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

The massive Unzendake volcanic complex comprises much of the Shimabara Peninsula east of the city of Nagasaki. An E-W graben, 30-40 km long, extends across the peninsula. Three large stratovolcanoes with complex structures, Kinugasa on the north, Fugen-dake at the east-center, and Kusenbu on the south, form topographic highs on the broad peninsula. Fugendake and Mayuyama volcanoes in the east-central portion of the andesitic-to-dacitic volcanic complex have been active during the Holocene. The Mayuyama lava dome complex, located along the eastern coast west of Shimabara City, formed about 4000 years ago and was the source of a devastating 1792 CE debris avalanche and tsunami. Historical eruptive activity has been restricted to the summit and flanks of Fugendake. The latest activity during 1990-95 formed a lava dome at the summit, accompanied by pyroclastic flows that caused fatalities and damaged populated areas near Shimabara City.

Sintesi da Wikipedia

Il monte Unzen è un gruppo vulcanico attivo costituito da diversi stratovulcani sovrapposti. Si trova vicino alla città di Shimabara, nella prefettura di Nagasaki sull'isola di Kyūshū, la terza per grandezza delle quattro isole principali del Giappone. Fu molto attivo nella prima metà degli anni novanta ed un'eruzione nel 1991 uccise 43 persone che vi assistevano, tra cui 3 vulcanologi.

Wikipedia · CC BY-SA · Leggi l'articolo completo →

Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
4050 BCE~3848 BCE · 1 eruzioni · VEI max. ?2841 BCE~2639 BCE · 2 eruzioni · VEI max. ?2236 BCE~2035 BCE · 1 eruzioni · VEI max. ?1632 BCE~1430 BCE · 1 eruzioni · VEI max. ?1229 BCE~1027 BCE · 1 eruzioni · VEI max. ?787~988 · 1 eruzioni · VEI max. ?1593~1794 · 4 eruzioni · VEI max. 21794~1996 · 3 eruzioni · VEI max. 24050 BCE2639 BCE1027 BCE3841794

Cronologia dettagliata

  1. 1996VEI 2Osservata
    1996-02-10 – 1996-05-01
    Fugen-dake
  2. 1990VEI 1Osservata
    1990-11-17 – 1995-02-16
    Fugen-dake
  3. 1798VEI ?Stima geologica
    1798-11-13 – 1798-12
    Fugen-dake
  4. 1792VEI 2Osservata
    1792-02-10 – 1792-07-22
    Fugen-dake (summit, NNE), Mayu-yama
  5. 1690VEI ?Stima geologica
    1690 – 1692
  6. 1663VEI 2Osservata
    1663-04 – 1663-05
    Fugen-dake (Tsukumo-jima Pond)
  7. 1663VEI 2Osservata
    1663-12-11 – 1663-12-27
    NE flank of Fugen-dake (1200 m)
  8. 860VEI ?Stima geologica
    860 – In corso
  9. 1150 a.C. (±500 anni)VEI ?Stima geologica
    BCE 1150 – In corso
    Fugendake-Sancho
  10. 1450 a.C. (±500 anni)VEI ?Stima geologica
    BCE 1450 – In corso
    Fugen-dake (Kazaana)
  11. 2150 a.C. (±800 anni)VEI ?Stima geologica
    BCE 2150 – In corso
    Mayu-yama (Tengu-yama)
  12. 2640 a.C. (±500 anni)VEI ?Stima geologica
    BCE 2640 – In corso
    Mayu-yama (Shichimen-zan)
  13. 2720 a.C. (±300 anni)VEI ?Stima geologica
    BCE 2720 – In corso
    Fugen-dake
  14. 4050 a.C. (±3000 anni)VEI ?Stima geologica
    BCE 4050 – In corso
    Fugen-dake (Shimanomine)

Link esterni

⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.