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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 34.5°N
  • 131.6°E

  • 641 m
    2102 ft

  • 283001
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Abu.

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

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

Basic Data

Volcano Number

Last Known Eruption



6850 BCE

641 m / 2102 ft


Volcano Types

Pyroclastic cone(s)
Lava dome(s)

Rock Types

Andesite / Basaltic Andesite
Basalt / Picro-Basalt

Tectonic Setting

Subduction zone
Continental crust (> 25 km)


Within 5 km
Within 10 km
Within 30 km
Within 100 km

Geological Summary

The Abu volcano group, located along the Japan Sea coast near the SW end of Honshu, consists of basaltic-to-dacitic lava flows, small shield volcanoes (some of which have associated cinder cones) and lava domes. More than 40 monogenetic volcanoes are located in an area of 400 sq km. Iraoyama at 641 m forms the high point of this group of small volcanic edifices, some of which form offshore islands or submarine vents. Volcanism here is considered to be related to subduction of the Philippine Sea Plate. An earlier phase of activity at the dominantly Pleistocene Abu volcano group during the late-Pliocene to early Pleistocene was followed by renewed activity about 800,000 years ago that continued into the Holocene. The latest dated eruption was dated by thermoluminescence at about 8800 years ago.


The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

Hayakawa Y, 1996. (pers. comm.).

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Japan Association Quaternary Research, 1987. Quaternary Maps of Japan: Landforms, Geology, and Tectonics. Tokyo: Univ Tokyo Press.

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

Kiyosugi K, Conner C B, Zhao D, Connor L J, Tanaka K, 2010. Relationships between volcano distribution, crustal structure, and P-wave tomography: an example from the Abu Monogenetic Volcano Group, SW Japan. Bull Volc, 72: 331-340.

Koyaguchi T, 1986. Textural and compositional evidence for magma mixing and its mechanism, Abu volcano group, Southwestern Japan. Contr Mineral Petr, 93: 33-45.

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.

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/.

Ono K, Soya T, Mimura K, 1981. Volcanoes of Japan. Geol Surv Japan Map Ser, no 11, 2nd edition, 1:2,000,000.

Eruptive History

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
6850 BCE (?) Unknown Confirmed   Thermoluminescence Kasa-yama

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.


Feature Name Feature Type Elevation Latitude Longitude
Anduke Pyroclastic cone
Era Pyroclastic cone
Gongen-yama Pyroclastic cone
Husuma-yama Pyroclastic cone
Irao-san Pyroclastic cone
Iraro-san Minami Pyroclastic cone
Jyoman Pyroclastic cone
Kaneue Pyroclastic cone
Kasayama Pyroclastic cone 112 m 34° 26' 58" N 131° 24' 7" E
Katamata Pyroclastic cone
Komure-yama Pyroclastic cone
Nishi-Daihokusei Pyroclastic cone
Shiun-zan Pyroclastic cone
Sugihara Pyroclastic cone
Ubukanishi Pyroclastic cone


Feature Name Feature Type Elevation Latitude Longitude
Hashimasho Submarine crater
Hirasesho Submarine crater
Hukase Submarine crater
Hutashimasho Submarine crater
Nishi-Oshima Submarine crater
Okinosho Submarine crater
Oonoguri Submarine crater
Osabaguri Submarine crater
Tubase Submarine crater


Feature Name Feature Type Elevation Latitude Longitude
Nabe-yama Dome 369 m

Photo Gallery

This forested lava dome is part of the 571-m-high Abu volcano group, located along the Japan Sea coast near the SW end of Honshu. The Abu volcanic field consists of lava flows and small shield volcanoes, some of which have associated cinder cones and lava domes. Abu volcano is of either late-Pleistocene or early Holocene age.

Photo by Ichio Moriya (Kanazawa University).

Smithsonian Sample Collections Database

There are no samples for Abu in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites

Large Eruptions of Abu 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).
MODVOLC - HIGP MODIS Thermal Alert System Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.
MIROVA Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.