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Hachijō-jima

Hachijojima

Stratovolcano · Japan · 854m

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. · Photo: Photo by Ichio Moriya (Kanazawa University). · Wikimedia Commons
Type
Stratovolcano
Country
Japan
Region
Northwestern Pacific Volcanic Regions / Izu Volcanic Arc
Elevation
854m
Coordinates
33.137, 139.766
Last eruption
1606
Tectonic setting
Subduction zone / Oceanic crust (< 15 km)
Landform
Composite
Major rock type
Basalt / Picro-Basalt
Geological summary

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.

From Wikipedia

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 · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
8020 BCE~7696 BCE · 1 eruptions · max VEI 47696 BCE~7372 BCE · 1 eruptions · max VEI ?5102 BCE~4778 BCE · 1 eruptions · max VEI 34778 BCE~4453 BCE · 1 eruptions · max VEI 53481 BCE~3156 BCE · 1 eruptions · max VEI ?2832 BCE~2508 BCE · 2 eruptions · max VEI 32508 BCE~2184 BCE · 1 eruptions · max VEI 42184 BCE~1860 BCE · 1 eruptions · max VEI 51535 BCE~1211 BCE · 1 eruptions · max VEI ?1211 BCE~887 BCE · 1 eruptions · max VEI ?563 BCE~238 BCE · 1 eruptions · max VEI 3238 BCE~86 · 1 eruptions · max VEI ?734~1059 · 1 eruptions · max VEI ?1383~1707 · 5 eruptions · max VEI 28020 BCE5750 BCE3156 BCE887 BCE1383

Detailed timeline

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

External links

⚠ For reference only. Not for emergency response.