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Japan · Stratovolcano

Oshima Ōshima

Oshima-Oshima

Type
Stratovolcano
Elevation
732m
Last eruption
1790
Oshima Ōshima
Photo: Asacyan · CC BY-SA 3.0 · Wikimedia Commons
Type
Stratovolcano
Country
Japan
Region
Northwestern Pacific / Northeast Japan Volcanic Arc
Elevation
732m
Coordinates
41.510, 139.367
Last eruption
1790
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Basalt / Picro-basalt

Geological summary

Oshima-Oshima, a 10 km2 island about 105 km W offshore from the SW tip of Hokkaido, is the emergent summit of two coalescing basaltic-to-andesitic stratovolcanoes.

Excerpt from the Global Volcanism Program, Smithsonian Institution · Read the full summary on GVP →

From Wikipedia

Ōshima is an uninhabited island in the Sea of Japan, 50 kilometers (31 mi) west of Matsumae town and therefore the westernmost point of Hokkaido. It is part of the town of Matsumae in Oshima Subprefecture in Hokkaido, Japan. To distinguish Ōshima from other islands with the same name, it is sometimes known as Oshima Ōshima (渡島大島) or Matsumae Ōshima (松前大島).

Wikipedia · CC BY-SA · Read full article →

Eruption history

6 recordedGlossary

Record summary

Confirmed eruptions
5
Uncertain eruptions
1
Span of confirmed record
800 BCE (±100 yrs) – 1790
Largest confirmed eruption
VEI 4 (1741)
Confirmed eruptions since 1900
0
Summary (VEI over time)
Click a bar to see individual eruptions · Use arrow keys to move between bars, Enter to open
800 BCE~601 BCE · 1 eruptions · max VEI ?196~395 · 1 eruptions · max VEI ?1591~1790 · 4 eruptions · max VEI 4800 BCE202 BCE3959931591

Detailed timeline

  1. 1790VEI 2Observed
    1790-01 – end unknown
    Nishi-yama
  2. 1786VEI 2Method not stated
    1786 – end unknown
    Nishi-yama
  3. 1759VEI 2Observed
    1759-08-19 – end unknown
    Nishi-yama
  4. 1741VEI 4Observed
    1741-08-18 – 1742-05
    Nishi-yama
  5. 250 (±150 yrs)VEI ?Geological estimate
    250 – end unknown
    Nishi-yama
  6. 800 BCE (±100 yrs)VEI ?Geological estimate
    800 BCE – end unknown
    Nishi-yama

Nearby volcanoes

External links

⚠ For reference only. Not for emergency response.