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Hachijō-jima

Hachijojima

Stratovolkan · 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
Tipe
Stratovolkan
Negara
Japan
Wilayah
Pasifik Barat Laut / Izu Volcanic Arc
Ketinggian
854 m
Koordinat
33.137, 139.766
Letusan terakhir
1606
Kondisi tektonik
Subduction zone / Oceanic crust (< 15 km)
Bentuk lahan
Composite
Batuan utama
Basalt / Picro-Basalt
Ringkasan geologi

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.

Ringkasan Wikipedia

Ringkasan Inggris

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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Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
8020 BCE~7696 BCE · 1 letusan · VEI maks. 47696 BCE~7372 BCE · 1 letusan · VEI maks. ?5102 BCE~4778 BCE · 1 letusan · VEI maks. 34778 BCE~4453 BCE · 1 letusan · VEI maks. 53481 BCE~3156 BCE · 1 letusan · VEI maks. ?2832 BCE~2508 BCE · 2 letusan · VEI maks. 32508 BCE~2184 BCE · 1 letusan · VEI maks. 42184 BCE~1860 BCE · 1 letusan · VEI maks. 51535 BCE~1211 BCE · 1 letusan · VEI maks. ?1211 BCE~887 BCE · 1 letusan · VEI maks. ?563 BCE~238 BCE · 1 letusan · VEI maks. 3238 BCE~86 · 1 letusan · VEI maks. ?734~1059 · 1 letusan · VEI maks. ?1383~1707 · 5 letusan · VEI maks. 28020 BCE5750 BCE3156 BCE887 BCE1383

Garis waktu rinci

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

Tautan eksternal

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