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Izu-Tobu

Pyroclastic cone · Japan · 1406m

Snow mantles the western flanks of Omurayama scoria cone in the Izu-Tobu volcano group. Omuroyama formed about 5,000 years ago. The volcanic field is located across a broad, plateau-like area of more than 400 km2 on the E side of the Izu Peninsula. About 70 monogenetic cones erupted during the last 140,000 years, and chemically similar submarine cones are located offshore.
Snow mantles the western flanks of Omurayama scoria cone in the Izu-Tobu volcano group. Omuroyama formed about 5,000 years ago. The volcanic field is located across a broad, plateau-like area of more than 400 km2 on the E side of the Izu Peninsula. About 70 monogenetic cones erupted during the last 140,000 years, and chemically similar submarine cones are located offshore. · Photo: Copyrighted photo by Akira Takada (Japanese Quaternary Volcanoes database, RIODB, http://riodb02.ibase.aist.go.jp/strata/VOL_JP/EN/index.htm and Geol Surv Japan, AIST, http://www.gsj.jp/). · Wikimedia Commons
Type
Pyroclastic cone
Country
Japan
Region
Northwestern Pacific Volcanic Regions / Izu Volcanic Arc
Elevation
1406m
Coordinates
34.900, 139.098
Last eruption
1989
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Cluster
Major rock type
Basalt / Picro-Basalt
Geological summary

The Izu-Tobu volcano group (Higashi-Izu volcano group) is scattered over a broad, plateau-like area of more than 400 km2 on the E side of the Izu Peninsula. Construction of several stratovolcanoes continued throughout much of the Pleistocene and overlapped with growth of smaller monogenetic volcanoes beginning about 300,000 years ago. About 70 subaerial monogenetic volcanoes formed during the last 140,000 years, and chemically similar submarine cones are located offshore. These volcanoes are located on a basement of late-Tertiary volcanic rocks and related sediments and on the flanks of three Quaternary stratovolcanoes: Amagi, Tenshi, and Usami. Some eruptive vents are controlled by fissure systems trending NW-SE or NE-SW. Thirteen eruptive episodes have been documented during the past 32,000 years. Kawagodaira maar produced pyroclastic flows during the largest Holocene eruption about 3,000 years ago. The latest eruption occurred in 1989, when a small submarine crater was formed NE of Ito City.

From Wikipedia

Izu-Tobu is a large, dominantly basaltic range of volcanoes on the east side of the Izu Peninsula which lies on the Pacific coast of the island of Honshu in Japan. The field covers a total area of 400 km2. The only recorded activity was a submarine phreatic eruption, between the city of Ito and Hatsushima island, that lasted for just 10 minutes in 1989. Ito, home to 74,000 people, is known for its hot springs.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
8050 BCE~7715 BCE · 1 eruptions · max VEI 32361 BCE~2027 BCE · 2 eruptions · max VEI 41357 BCE~1023 BCE · 1 eruptions · max VEI 41023 BCE~688 BCE · 1 eruptions · max VEI 31654~1989 · 2 eruptions · max VEI 18050 BCE5708 BCE3030 BCE688 BCE1654

Detailed timeline

  1. 1989VEI 1Observed
    1989-07-13 – 1989-07-13
    Teishi-kaikyu (4 km NE of Ito City)
  2. 1930VEI ?Geological estimate
    1930-03-01 – Ongoing
    3.6 km NE of Teishi-jima
  3. 750 BCEVEI 3Geological estimate
    BCE 750 – Ongoing
    Iwano-yama, Iyuzan, and other vents
  4. 1150 BCE (±50 yrs)VEI 4Geological estimate
    BCE 1150 – Ongoing
    Kawagodaira
  5. 2050 BCEVEI ?Geological estimate
    BCE 2050 – Ongoing
    Yoichizaka
  6. 2100 BCE (±100 yrs)VEI 4Geological estimate
    BCE 2100 – Ongoing
    Omuro-yama
  7. 8050 BCEVEI 3Geological estimate
    BCE 8050 – Ongoing
    Akakubo

External links

⚠ For reference only. Not for emergency response.