Rishirizan

Photo of this volcano
Google Earth icon
  Google Earth Placemark
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 45.179°N
  • 141.242°E

  • 1721 m
    5645 ft

  • 285041
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Rishirizan.

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

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

Rishirizan is a highly dissected andesitic stratovolcano that forms a 20-km-wide island west of the northern tip of Hokkaido. Extensive erosion has produced an extremely rugged topography, with a dramatic sharp-topped, 1719-m-high summit flanked by steep-sided radial ridges. A stratovolcano and flank lava domes were constructed beginning less than 200,000 years ago. Eruptions at the stratovolcano ceased about 37,000 years ago, after which only flank vents were active. Late-stage eruptions took place from scoria cones and maars along a 15-km-long NW-SE trend that extends to the SE coast. Flank eruptions were dominantly basaltic, but also included andesitic and rhyolitic activity. Extensive late-stage lava flows during the late Pleistocene form much of the northern and western coasts and extend offshore. The latest eruptions took place a few thousand years ago.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
5830 BCE ± 300 years Unknown Confirmed   Radiocarbon (uncorrected) Rs-Ho 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
Risiri | Rishiri
Rishiri is a highly dissected andesitic stratovolcano that forms an island west of the northern tip of Hokkaido. The main edifice ceased erupting during the Pleistocene, and extensive erosion has created a rugged dissected summit flanked by radial knife-edged ridges. Scoria cones and maars on the lower flanks have been active during the late Pleistocene and early Holocene.

Photo by Yoshihiro Ishizuka, 1997 (Hokkaido University).
Rishiri volcano is a highly dissected stratovolcano that forms an island off the NW tip of Hokkaido. The composite cone (center) and flank scoria cones (middle ground) are mirrored on the surface of a maar on the lower south flank. The stratovolcano was constructed during the Pleistocene. Scoria cones and maars on the lower flanks erupted 30,000-8,000 years ago.

Photo by Yoshihiro Ishizuka, 1993 (Hokkaido University).

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.

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

Ishizuka Y, 1999. Eruptive history of Rishiri volcano, northern Hokkaido, Japan. Bull Volc Soc Japan (Kazan), 44: 23-40 (in Japanese with English abs).

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

Kuritani T, Yoshida T, Nagahashi Y, 2010. Internal differentiation of Kutsugata lava flow from Rishiri Volcano, Japan: Processes and timescales of segregation structures' formation. J Volc Geotherm Res, 195: 57-68.

Machida H, 1976. Stratigraphy and chronology of late Quaternary marker-tephras in Japan. Tokyo Metropolitan Univ Geog Rpt, 11: 109-132.

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
Pyroclastic cone(s)
Lava dome(s)

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Major
Andesite / Basaltic Andesite
Dacite
Basalt / Picro-Basalt
Minor
Rhyolite

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
178
9,895
12,933
94,414

Affiliated Databases

Large Eruptions of Rishirizan 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.