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Izu Tobu volcano group, Japan
Snow drapes the western flanks of Omura-yama scoria cone in the Izu-Tobu volcano group.
Omuro-yama, the most well-known feature of the Izu-Tobu volcano group (also known as the Higashi-Izu volcano group), formed about 5000 years ago.
The volcanic field is scattered over a broad, plateau-like area of more than 400 sq km on the east side of the Izu Peninsula.
About 70 subaerial monogenetic volcanoes formed during the last 140,000 years, and chemically similar submarine cones are located offshore.
The Izu-Tobu volcano group (Higashi-Izu volcano group) is scattered over a broad, plateau-like area of more than 400 sq km on the east 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 NW-SE- or NE-SW-trending fissure systems.
Thirteen eruptive episodes have been documented during the past 32,000 years.
Kawagodaira maar produced pyroclastic flows during the largest Holocene eruption about 3000 years ago.
The latest eruption occurred in 1989, when a small submarine crater was formed NE of Ito City.
PHOTO SOURCE: Akira Takada, Japanese Quaternary Volcanoes database, RIODB and Geol Surv Japan, AIST, courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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