Shiretoko-Iozan

Photo of this volcano
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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 44.133°N
  • 145.161°E

  • 1562 m
    5123 ft

  • 285090
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Shiretoko-Iozan.

The Global Volcanism Program has no Weekly Reports available for Shiretoko-Iozan.

The Global Volcanism Program has no Bulletin Reports available for Shiretoko-Iozan.

Shiretoko-Iozan, one of many Japanese "sulfur mountains," is noted for the extrusion of molten sulfur during eruptions in 1889 and 1936. Located at the NE tip of Hokkaido on the Shiretoko Peninsula, the andesitic volcano contains two large craters at the summit that are breached to the NW. The southern crater contains a small flat-topped lava dome. The main cone, Nakadake, was constructed NW of the headwalls of the two breached craters. Historical eruptions have originated from the southernmost of three explosion craters along a NNE-SSW line on the NW flank of the main cone.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1935 Dec 1936 Oct Confirmed 1 Historical Observations NW flank
1890 Jun 15 Unknown Confirmed 1 Historical Observations NW flank
1889 Aug 9 1889 Oct 7 ± 7 days Confirmed 2 Historical Observations NW flank
[ 1880 Nov 24 ] [ 1880 Nov 26 ] Uncertain    
1876 Sep 23 1876 Sep 26 Confirmed 2 Historical Observations NW flank
1857 1858 Confirmed   Historical Observations
0850 ± 500 years Unknown Confirmed   Tephrochronology St-1 tephra

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

Siretoko-Iwo-zan | Siretoko-io-zan | Itasibeoni-Iwo-zan | Itashibeoni-Iwo-zan | Shiretoko-Io-zan | Shiretoko-Iwo-zan

Cones

Feature Name Feature Type Elevation Latitude Longitude
Nakadake
    Naka-dake
Cone
Shiretoko-Iozan Stratovolcano

Craters

Feature Name Feature Type Elevation Latitude Longitude
Chuhuku Crater
Kitadake
    Kita-dake
Crater
Minamidake
    Minami-dake
Crater

Domes

Feature Name Feature Type Elevation Latitude Longitude
Namakoyama
    Namako-yama
Dome
Nampo Dome
Shiretoko-Iwo-zan, one of many Japanese "sulfur mountains," is seen here in late Spring from the Shiretoko-Goko (Shiretoko Five Lakes) on the west side of the volcano. Shiretoko-Iwo-zan, located at the NE tip of Hokkaido on the Shiretoko Peninsula, is noted for the extrusion of molten sulfur during eruptions in 1889 and 1936. Two large craters at the summit are breached to the NW.

Copyrighted photo by Yasuo Ikeda, 1994 (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, 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.

Murayama I, 1987. Volcanoes of Japan (I). Tokyo: Daimedo, 315 p (2nd edition, in Japanese).

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/.

Volcano Types

Stratovolcano
Lava dome

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Major
Andesite / Basaltic Andesite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
6
1,516
7,890
209,060

Affiliated Databases

Large Eruptions of Shiretoko-Iozan 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.