Aogashima

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 32.458°N
  • 139.759°E

  • 423 m
    1387 ft

  • 284060
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Aogashima.

The Global Volcanism Program has no Weekly Reports available for Aogashima.

The Global Volcanism Program has no Bulletin Reports available for Aogashima.

The small 2.5 x 3.5 km dominantly basaltic island of Aogashima is surrounded by steep cliffs and contains a small 1.7 x 1.5-km-wide caldera. Two pyroclastic cones were formed inside the caldera during the latest eruption from 1780 to 1785. Growth of the volcano began with construction of the Kurosaki stratovolcano in the NW part of the island, after which the main stratovolcano began growing in the SE. Both summit and flank vents produced pyroclastic surges and lava flows. Late in the construction of the main cone a 1-1.5 km crater was formed on the SE flank. About 3000 years ago pyroclastic surges swept over the entire island. During about the next 600 years, lava flows and scoria deposits filled the SE crater, which also collapsed repeatedly. The current Ikenosawa crater was considered by Takada et al. (1992) to have formed by ring collapse at the time of a debris avalanche, after which the volcano was quiescent until the eruptions of historical time.

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1780 Jul 27 1785 May (?) Confirmed 3 Historical Observations Maru-yama, SW part of Ikenosawa crater
1670 1680 Confirmed 2 Historical Observations Ikenosawa crater
1652 Unknown Confirmed 3 Historical Observations Ikenosawa crater
0600 BCE ± 200 years Unknown Confirmed 4 Radiocarbon (uncorrected) SE flank (Kintagaura)
1100 BCE ± 300 years Unknown Confirmed   Tephrochronology NNW flank
1200 BCE ± 50 years Unknown Confirmed   Radiocarbon (corrected)
1800 BCE ± 100 years Unknown Confirmed 2 Radiocarbon (corrected) Northwest flank

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.



Synonyms
Aoga-shima


Cones
Feature Name Feature Type Elevation Latitude Longitude
Kurasaki Stratovolcano
Maru-yama Cone 223 m


Craters
Feature Name Feature Type Elevation Latitude Longitude
Ikenosawa Caldera 423 m
Yuba-no-Tonbu Crater 210 m
The small 2.5 x 3.5 km basaltic island of Aoga-shima, seen here from the SE, is located in the central Izu Islands. Aoga-shima is surrounded by steep cliffs and contains a small 1.7 x 1.5-km-wide caldera. Two pyroclastic cones were formed inside the caldera during the volcano's latest eruption from 1780 to 1785.

Photo by Richard Fiske (Smithsonian Institution).

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

Japan Meteorological Agency, 1996. National Catalogue of the Active Volcanoes in Japan (second edition). Tokyo: Japan Meteorological Agency, 502 p (in Japanese).

Japan Meteorological Agency, 2013. National Catalogue of the Active Volcanoes in Japan (fourth edition, English version). Japan Meteorological Agency.

Kudo T, Hoshizumi H, 2006-. Catalog of eruptive events within the last 10,000 years in Japan, database of Japanese active volcanoes. Geol Surv Japan, AIST, http://riodb02.ibase.aist.go.jp/db099/eruption/index.html.

Kuno H, 1962. Japan, Taiwan and Marianas. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 11: 1-332.

Nakano S, Yamamoto T, Iwaya T, Itoh J, Takada A, 2001-. Quaternary Volcanoes of Japan. Geol Surv Japan, AIST, http://www.aist.go.jp/RIODB/strata/VOL_JP/.

Takada A, Murakami F, Yuasa M, 1994. Geological maps of Aogashima volcano and submarine volcanoes south of Izu Islands. Geol Surv Japan, 1:10,000 geologic map.

Takada A, Oshima O, Aramaki S, Ono K, Yoshida T, Kajima K, 1992. Geology of Aogashima volcano, Izu Islands, Japan. Bull Volc Soc Japan (Kazan), 37: 233-250.

Volcano Types

Stratovolcano
Caldera
Pyroclastic cone(s)

Tectonic Setting

Subduction zone
Oceanic crust (< 15 km)

Rock Types

Major
Basalt / Picro-Basalt
Andesite / Basaltic Andesite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
232
232
232
8,559

Affiliated Databases

Large Eruptions of Aogashima Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.