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Hachijō-jima

Hachijojima

Stratovulcano · Japan · 854 m

Nishiyama volcano, seen here from the older Higashiyama, forms the NW part of Hachijojima island. The island's airport and its largest town occupy the flanks. The small volcanic island of Kojima (upper left) lies several kilometers to the west. Major activity from the early Holocene until about 4,000 years ago was restricted to flank eruptions.
Nishiyama volcano, seen here from the older Higashiyama, forms the NW part of Hachijojima island. The island's airport and its largest town occupy the flanks. The small volcanic island of Kojima (upper left) lies several kilometers to the west. Major activity from the early Holocene until about 4,000 years ago was restricted to flank eruptions. · Foto: Photo by Ichio Moriya (Kanazawa University). · Wikimedia Commons
Tipo
Stratovulcano
Paese
Japan
Regione
Pacifico nord-occidentale / Izu Volcanic Arc
Altitudine
854 m
Coordinate
33.137, 139.766
Ultima eruzione
1606
Contesto tettonico
Subduction zone / Oceanic crust (< 15 km)
Forma vulcanica
Composite
Roccia principale
Basalt / Picro-Basalt
Sintesi geologica

Hachijojima, in the central Izu Islands about 300 km S of Tokyo, consists of two small Quaternary dominantly basaltic stratovolcanoes forming an elongated NW-SE-trending island. The eroded Pleistocene-to-Holocene Higashiyama volcano occupies the SE end of the 14-km-long island. The symmetrical Holocene Nishiyama volcano the NW end has cones on the SE flank. The small volcanic island of Kojima lies several kilometers W of Hachijojima. Growth of Higashiyama began several tens of thousands of years ago, and included the formation of two small calderas. The initial submarine and early subaerial eruptions of Nishiyama took place from 10,000 to 8,000 years before present (BP). Its latest major activity, from the early Holocene until about 4,000 BP, was restricted to flank eruptions. Eruptions recorded since the 15th century have been restricted to the summit of Nishiyama and a submarine vent of unknown location.

Sintesi da Wikipedia

Riassunto in inglese

Hachijō-jima is a volcanic island of Japan in the Pacific Ocean. It is about 287 km (178 mi) south of the special wards of Tokyo. It is part of the Izu archipelago and within the Fuji-Hakone-Izu National Park. Its only municipality is Hachijō. On 1 March 2018, its population was 7,522 people living on 63 km2. Some inhabitants speak Hachijō language, which is considered an endangered language and the number of speakers is unknown. The island has been inhabited since the Jōmon period, and was used as a place of exile during the Edo period. In modern times, it has been used for farming sugarcane and housing a secret submarine base during World War II; it is now a tourist destination within Japan.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
8020 BCE~7696 BCE · 1 eruzioni · VEI max. 47696 BCE~7372 BCE · 1 eruzioni · VEI max. ?5102 BCE~4778 BCE · 1 eruzioni · VEI max. 34778 BCE~4453 BCE · 1 eruzioni · VEI max. 53481 BCE~3156 BCE · 1 eruzioni · VEI max. ?2832 BCE~2508 BCE · 2 eruzioni · VEI max. 32508 BCE~2184 BCE · 1 eruzioni · VEI max. 42184 BCE~1860 BCE · 1 eruzioni · VEI max. 51535 BCE~1211 BCE · 1 eruzioni · VEI max. ?1211 BCE~887 BCE · 1 eruzioni · VEI max. ?563 BCE~238 BCE · 1 eruzioni · VEI max. 3238 BCE~86 · 1 eruzioni · VEI max. ?734~1059 · 1 eruzioni · VEI max. ?1383~1707 · 5 eruzioni · VEI max. 28020 BCE5750 BCE3156 BCE887 BCE1383

Cronologia dettagliata

  1. 1707VEI 2Stima geologica
    1707 – In corso
  2. 1606VEI 2Osservata
    1606-01-23 – In corso
    Submarine flank
  3. 1605VEI 2Osservata
    1605-10-27 – In corso
    Nishi-yama SE flank
  4. 1518VEI 2Osservata
    1518-02 – 1523
    Nishi-yama
  5. 1487VEI 2Osservata
    1487-12-07 – In corso
    Nishi-yama
  6. 850 (±200 anni)VEI ?Stima geologica
    850 – In corso
    Nishi-yama summit and SE flank
  7. 150 a.C. (±50 anni)VEI ?Stima geologica
    BCE 150 – In corso
    Nishi-yama
  8. 350 a.C. (±500 anni)VEI 3Stima geologica
    BCE 350 – In corso
    NW flank of Higashi-yama
  9. 1150 a.C. (±700 anni)VEI ?Stima geologica
    BCE 1150 – In corso
    SE flank of Nishi-yama (Kanda-yama)
  10. 1250 a.C. (±800 anni)VEI ?Stima geologica
    BCE 1250 – In corso
    Nishi-yama
  11. 2050 a.C.VEI 5Stima geologica
    BCE 2050 – In corso
    SE of Nishi-yama, NE of Higashi-yama
  12. 2450 a.C. (±500 anni)VEI 4Stima geologica
    BCE 2450 – In corso
    Nishi-yama
  13. 2550 a.C. (±500 anni)VEI 3Stima geologica
    BCE 2550 – In corso
    S flank of Higashi-yama (Myohoji)
  14. 2700 a.C. (±100 anni)VEI 3Stima geologica
    BCE 2700 – In corso
    Between Nishi-yama & Higashi-yama
  15. 3350 a.C. (±1300 anni)VEI ?Stima geologica
    BCE 3350 – In corso
    Nishi-yama
  16. 4650 a.C.VEI 5Stima geologica
    BCE 4650 – In corso
    Nishi-yama
  17. 5020 a.C. (±370 anni)VEI 3Stima geologica
    BCE 5020 – In corso
    Higashi-yama south flank
  18. 7650 a.C. (±3000 anni)VEI ?Stima geologica
    BCE 7650 – In corso
    Nishi-yama
  19. 8020 a.C. (±2640 anni)VEI 4Stima geologica
    BCE 8020 – In corso
    Nishi-yama

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