Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 36.891°N
  • 138.114°E

  • 2454 m
    8049 ft

  • 283100
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Myokosan.

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

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

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.

Eruptive History

There is data available for 10 Holocene eruptive periods.

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
0750 BCE Unknown Confirmed   Tephrochronology
1200 BCE (?) Unknown Confirmed   Tephrochronology
2100 BCE ± 500 years Unknown Confirmed   Tephrochronology
2750 BCE ± 100 years Unknown Confirmed 4 Radiocarbon (corrected) Otagirigawa Ash; OT-a tephra
2900 BCE (?) Unknown Confirmed   Tephrochronology
3450 BCE (?) Unknown Confirmed   Tephrochronology
3700 BCE (?) Unknown Confirmed   Tephrochronology
4000 BCE (?) Unknown Confirmed   Tephrochronology
4300 BCE (?) Unknown Confirmed   Tephrochronology
4750 BCE ± 300 years Unknown Confirmed 5 Radiocarbon (corrected) Akakura Ash; AK-a tephra

Deformation History

There is no Deformation History data available for Myokosan.

Emission History

There is no Emissions History data available for Myokosan.

Photo Gallery

Myoko is a steep-sided stratovolcano in west-central Honshu that overlooks the popular resort of Lake Nojiri. This springtime view from Madarao, SE of Myoko, shows a 3-km-wide caldera breached to the east that is partially filled by a flat-topped lava dome forming the volcano's high point. Several episodes of edifice collapse at Myoko have produced major debris avalanches that traveled to the east and NE. The latest dated eruptions of Myoko occurred during the mid Holocene. No historical eruptions are known, but constant solfataric activity occurs.

Photo by Yukio Hayakawa, 1998 (Gunma University).
See title for photo information.

Smithsonian Sample Collections Database

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

Affiliated Sites