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Harunasan

Photo of this volcano
  • Japan
  • Stratovolcano
  • 550 CE
  •  
  • Country
  • Primary Volcano Type
  • Last Known Eruption
  •  
  • 36.477°N
  • 138.851°E

  • 1449 m
    4754 ft

  • 283122
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Harunasan.

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

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

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 3 confirmed Holocene eruptive periods.

0550 Jun 1 ± 10 years ± 30 days Confirmed Eruption Max VEI: 5

Episode 1 | Eruption Episode Futatsu-dake
0550 Jun 1 ± 10 years ± 30 days - Unknown Evidence from Correlation: Anthropology

List of 8 Events for Episode 1 at Futatsu-dake

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion violent, strong, or large
   - - - -    - - - - Pyroclastic flow
   - - - -    - - - - Lava dome
   - - - -    - - - - Bombs
   - - - -    - - - - Pumice
   - - - -    - - - - Lahar or Mudflow
   - - - -    - - - - Property Damage
0550 Jun 1 ± 10 years ± 30 days    - - - - VEI (Explosivity Index)

0520 Jun 1 ± 10 years ± 30 days Confirmed Eruption Max VEI: 4

Episode 1 | Eruption Episode Futatsu-dake
0520 Jun 1 ± 10 years ± 30 days - Unknown Evidence from Correlation: Anthropology

List of 6 Events for Episode 1 at Futatsu-dake

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion violent, strong, or large
   - - - -    - - - - Pyroclastic flow
   - - - -    - - - - Ash
   - - - -    - - - - Lahar or Mudflow
   - - - -    - - - - Property Damage
0520 Jun 1 ± 10 years ± 30 days    - - - - VEI (Explosivity Index)

0450 ± 50 years Confirmed Eruption Max VEI: 3

Episode 1 | Eruption Episode Futatsu-dake
0450 ± 50 years - Unknown Evidence from Correlation: Tephrochronology

List of 4 Events for Episode 1 at Futatsu-dake

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Ash
   - - - -    - - - - Pumice
0450 ± 50 years    - - - - VEI (Explosivity Index)
Deformation History

There is no Deformation History data available for Harunasan.

Emission History

There is no Emissions History data available for Harunasan.

Photo Gallery

Harunasan has a small summit caldera containing Haruna-Fuji cone (right). Viscous lava flows and lava domes have formed within and around the caldera. Its western side is currently filled by Lake Haruna, which is visible to the left of the cone. The Futatsudake lava dome, outside the caldera to the E, was the source of two large explosive eruptions during the 6th century CE. This view from the NE also shows a plume emanating from Asamayama on the distant horizon above Lake Haruna.

Photo by Ichio Moriya (Kanazawa University).
Harunasan volcano has an irregular profile, seen here from an archaeological site to the ENE. The peak to the left-center is Futatsudake lava dome, the source of two large explosive eruptions during the 5th and 6th centuries. Tephra layers from both Harunasan and Asamayama buried structures at the archaeological site.

Photo by Tom Simkin, 1993 (Smithsonian Institution).
The summit of Harunasan is seen here from near Maebashi City, SE of the volcano. It contains a caldera and lava domes inside the caldera and on its rim and flanks. Futatsudake, the peak to the right, was the source of two major explosive eruptions during the 5th and 6th centuries.

Photo by Tom Simkin, 1993 (Smithsonian Institution).
Haruna-Fuji is a cone of Harunasan, seen here above Lake Haruna in the W side of the caldera. The Futatsudake lava dome to the E was the source of two large explosive eruptions during the 6th century CE.

Photo by Yukio Hayakawa, 1998 (Gunma University).
Harunasan volcano is seen here from Gunma University in the city of Maebashi to the SE. A small caldera is at the summit along with several cones and lava domes that have formed within it. Two major explosive eruptions originated from the Futatsudake lava dome on the eastern side of the volcano during the 6th century.

Photo by Yukio Hayakawa, 1998 (Gunma University).
GVP Map Holdings

The maps shown below have been scanned from the GVP map archives and include the volcano on this page. Clicking on the small images will load the full 300 dpi map. Very small-scale maps (such as world maps) are not included. The maps database originated over 30 years ago, but was only recently updated and connected to our main database. We welcome users to tell us if they see incorrect information or other problems with the maps; please use the Contact GVP link at the bottom of the page to send us email.

Smithsonian Sample Collections Database

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

External Sites