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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 31.771°N
  • 130.592°E

  • 40 m
    131 ft

  • 282081
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Yonemaru-Sumiyoshiike.

The Global Volcanism Program has no Weekly Reports available for Yonemaru-Sumiyoshiike.

The Global Volcanism Program has no Bulletin Reports available for Yonemaru-Sumiyoshiike.

Volcano Types


Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Basalt / Picro-Basalt


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

Geological Summary

Yonemaru and Sumiyoshiike are two basaltic maars formed in coastal lowland deposits north of the Aira caldera. The eruptions occurred during a period of rising sea level at the beginning of the Holocene. The 500-m-wide Sumiyoshiike was created about 7000 years ago. The larger, 1.2-km-wide Yonemaru erupted about 2 km W of Sumiyoshiike about 6500 years ago and produced pyroclastic surges that traveled 4 km from the vent.

Eruptive History

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
6200 BCE (?) Unknown Confirmed 3 Tephrochronology Yonemaru
6250 BCE (?) Unknown Confirmed 2 Tephrochronology Sumiyoshi-ike

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
Sumiyoshiike Maar 40 m 31° 46' 17" N 130° 35' 31" E
Yonemaru Maar 15 m 31° 46' 34" N 130° 33' 55" E

Photo Gallery

Sumiyoshi-ike maar provides a backdrop to a campground on the south side of the lake. The 500-m-wide maar was created about 7000 years ago. Sumiyoshi-ike and Yonemaru are two maars that formed in coastal lowland deposits north of the Aira caldera during a period of rising sea level at the beginning of the Holocene. The larger, 1.2-km-wide Yonemaru maar erupted about 2 km west of Sumiyoshi-ike about 6500 years ago.

Copyrighted photo by Yoshihisa Kawanabe (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/).


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, 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.

Moriwaki H, Machida H, Hatsumi Y, Matsushima Y, 1986. Phreatomagmatic eruptions affected by postglacial transgression in the northern coastal area of Kagoshima Bay, southern Kyushu, Japan. Chigaku Zasshi (Jour Geog), 95: 24-43 (in Japanese with English abs).

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/.

Affiliated Databases

Large Eruptions of Yonemaru-Sumiyoshiike 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.