Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 27.881°N
  • 128.223°E

  • 212 m
    695 ft

  • 282020
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Io-Torishima.

The Global Volcanism Program has no Weekly Reports available for Io-Torishima.

The Global Volcanism Program has no Bulletin Reports available for Io-Torishima.

Eruptive History

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1968 Jul 18 1968 Jul 18 Confirmed 1 Historical Observations
1967 Nov 25 ± 5 days Unknown Confirmed 1 Historical Observations
1959 Jun 8 1959 Jul 16 ± 15 days Confirmed 2 Historical Observations Iwo-dake
1903 Mar 15 ± 5 days 1903 Aug 26 ± 5 days Confirmed 2 Historical Observations
1868 Feb 1868 Apr Confirmed 1 Historical Observations
1855 Mar 1855 May Confirmed 2 Historical Observations
1829 Dec 1 1829 Dec 16 Confirmed 1 Historical Observations
1796 Oct 1796 Nov Confirmed 2 Historical Observations Iwo-dake
1664 Unknown Confirmed   Historical Observations

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.

Photo Gallery

The island of Tori-shima is seen in an aerial perspective from the SW in this computer-generated graphic image. The 1 x 2.7 km island (also known as Okinawa-Tori-shima), consists of two overlapping volcanoes. Iwo-dake (Sulfur Peak) forms the summit of the NW volcano (left), which contains a small lake, solfataras, and sulfur deposits that were mined in the past. A lava dome occupies the center of the inner of two sommas on the SE-most volcano (right), whose high point, Mae-dake, lies at the SE tip of the island.

Photo courtesy of Bird's-Eye Japan (
See title for photo information.

Smithsonian Sample Collections Database

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

Affiliated Sites