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Hachijōjima

Hachijojima

Estratovolcán · 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
Estratovolcán
País
Japan
Región
Northwestern Pacific Volcanic Regions / Izu Volcanic Arc
Altitud
854 m
Coordenadas
33.137, 139.766
Última erupción
1606
Contexto tectónico
Subduction zone / Oceanic crust (< 15 km)
Forma volcánica
Composite
Roca principal
Basalt / Picro-Basalt
Resumen geológico

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.

Resumen de Wikipedia

Resumen en inglés

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.

Wikipedia · CC BY-SA · Leer artículo completo →

Historial de erupciones

Resumen (VEI en el tiempo)
Haga clic en una barra para ver erupciones individuales
8020 BCE~7696 BCE · 1 erupciones · VEI máx. 47696 BCE~7372 BCE · 1 erupciones · VEI máx. ?5102 BCE~4778 BCE · 1 erupciones · VEI máx. 34778 BCE~4453 BCE · 1 erupciones · VEI máx. 53481 BCE~3156 BCE · 1 erupciones · VEI máx. ?2832 BCE~2508 BCE · 2 erupciones · VEI máx. 32508 BCE~2184 BCE · 1 erupciones · VEI máx. 42184 BCE~1860 BCE · 1 erupciones · VEI máx. 51535 BCE~1211 BCE · 1 erupciones · VEI máx. ?1211 BCE~887 BCE · 1 erupciones · VEI máx. ?563 BCE~238 BCE · 1 erupciones · VEI máx. 3238 BCE~86 · 1 erupciones · VEI máx. ?734~1059 · 1 erupciones · VEI máx. ?1383~1707 · 5 erupciones · VEI máx. 28020 BCE5750 BCE3156 BCE887 BCE1383

Línea de tiempo detallada

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

Enlaces externos

⚠ Solo como referencia. No apto para respuesta ante emergencias.