Omanago Group

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 36.795°N
  • 139.507°E

  • 2341 m
    7678 ft

  • 283142
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Omanago Group.

The Global Volcanism Program has no Weekly Reports available for Omanago Group.

The Global Volcanism Program has no Bulletin Reports available for Omanago Group.

Eruptive History


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


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
3050 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected) Mitsu-dake

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 Omanago volcano group (upper left) consists of a series of five closely spaced lava domes in Nikko National Park. The highest of the dacitic domes is 2367-m-high Omanago, located at the SE end of the complex. Mitsu-dake, the NW-most dome, is a complex lava dome. The higher northern peak of the Mitsu-dake complex is out of view to the left, and the lower southern dome forms the low ridge behind the hot spring resort of Yunoko lake in the center of the photo. The prominent peak on the right horizon is Nantai volcano.

Photo by Lee Siebert, 1964 (Smithsonian Institution).
See title for photo information.

Smithsonian Sample Collections Database


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

Affiliated Sites