Hakkodasan

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 40.659°N
  • 140.877°E

  • 1585 m
    5199 ft

  • 283280
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Bulletin Report: June 1997 (BGVN 22:06) Citation IconCite this Report


Volcanogenic carbon dioxide kills soldiers in a topographic depression

On 14 July press reports noted that a party of the Ground Self Defense Force (Japanese army) on a training mission at the N foot of Hakkoda volcano without gas masks accidentally inhaled dangerous gases. In the darkness, some members of the party slipped into a depression (18 m long, 11 m wide, and 8 m deep), as did those who first tried to rescue them. The men were hospitalized on the evening of 12 July, but three lost their lives. There were no plants within the depression, and leaves on plants around it were dead. The fire station of the Aomori Prefecture mentioned that many holes and depressions emitting sulfurous acidic gases were located around this volcano. Local farmers reported dead animals in these depressions.

According to J. Hirabayashi, who inspected the depression on 13 July, its gases contained as much as 15-20 volume percent CO2 (much higher than the normal value of 0.035%), but no hydrogen sulfide. Delta 13C values were -5.7 for CO2 in the gas from the depression collected on 13 July, -6.1 for CO2 dissolved in water samples from the Hakkoda hotsprings, and -6.0 in the springwater from near the depression, collected on 14 July. These results indicated a magmatic origin for the CO2-rich gas because delta 13C of CO2 in volcanic gas in Japan ranges from -10 to 0 , whereas that in CO2 gas of organic origin ranges from -30 to -20 .

Information Contacts: Takeshi Ohba and Jun-ichi Hirabayashi, Tokyo Institute of Technology, 2-12-1 O-okayama,Meguro-ku, Tokyo 152, Japan (Email: ohba@ksvo.titech.ac.jp; jhirabay@ksvo.titech.ac.jp); Setsuya Nakada, Volcano Research Center, Earthquake Research Institute, University of Tokyo, Yayoi 1-1- 1, Bunkyo-ku, Tokyo 113, Japan (Email: nakada@eri.u-tokyo.ac.jp, URL: http://hakone.eri.u- tokyo.ac.jp/vrc/vrc.html).

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

Bulletin Reports - Index


Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

06/1997 (BGVN 22:06) Volcanogenic carbon dioxide kills soldiers in a topographic depression




Information is preliminary and subject to change. All times are local (unless otherwise noted)


June 1997 (BGVN 22:06) Citation IconCite this Report


Volcanogenic carbon dioxide kills soldiers in a topographic depression

On 14 July press reports noted that a party of the Ground Self Defense Force (Japanese army) on a training mission at the N foot of Hakkoda volcano without gas masks accidentally inhaled dangerous gases. In the darkness, some members of the party slipped into a depression (18 m long, 11 m wide, and 8 m deep), as did those who first tried to rescue them. The men were hospitalized on the evening of 12 July, but three lost their lives. There were no plants within the depression, and leaves on plants around it were dead. The fire station of the Aomori Prefecture mentioned that many holes and depressions emitting sulfurous acidic gases were located around this volcano. Local farmers reported dead animals in these depressions.

According to J. Hirabayashi, who inspected the depression on 13 July, its gases contained as much as 15-20 volume percent CO2 (much higher than the normal value of 0.035%), but no hydrogen sulfide. Delta 13C values were -5.7 for CO2 in the gas from the depression collected on 13 July, -6.1 for CO2 dissolved in water samples from the Hakkoda hotsprings, and -6.0 in the springwater from near the depression, collected on 14 July. These results indicated a magmatic origin for the CO2-rich gas because delta 13C of CO2 in volcanic gas in Japan ranges from -10 to 0 , whereas that in CO2 gas of organic origin ranges from -30 to -20 .

Information Contacts: Takeshi Ohba and Jun-ichi Hirabayashi, Tokyo Institute of Technology, 2-12-1 O-okayama,Meguro-ku, Tokyo 152, Japan (Email: ohba@ksvo.titech.ac.jp; jhirabay@ksvo.titech.ac.jp); Setsuya Nakada, Volcano Research Center, Earthquake Research Institute, University of Tokyo, Yayoi 1-1- 1, Bunkyo-ku, Tokyo 113, Japan (Email: nakada@eri.u-tokyo.ac.jp, URL: http://hakone.eri.u- tokyo.ac.jp/vrc/vrc.html).

Eruptive History


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


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1550 ± 100 years Unknown Confirmed 1 Radiocarbon (corrected) SW flank of O-dake (Jigoku-numa)
1340 ± 75 years Unknown Confirmed 1 Radiocarbon (corrected) SW flank of O-dake (Jigoku-numa)
0450 (?) Unknown Confirmed 1 Radiocarbon (corrected) O-dake, Hk-1 tephra
0050 BCE (?) Unknown Confirmed 1 Radiocarbon (corrected) O-dake, Hk-2 tephra
1150 BCE (?) Unknown Confirmed 1 Radiocarbon (corrected) O-dake, Hk-3 tephra
2250 BCE (?) Unknown Confirmed 3 Radiocarbon (corrected) O-dake, Hk-4 tephra
2850 BCE (?) Unknown Confirmed 2 Radiocarbon (corrected) O-dake, Hk-5 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.

Photo Gallery


The Hakkoda volcano consists of a group of 14 stratovolcanoes and lava domes south of Mutsu Bay at the northern end of Honshu. The NE rim of an 8-km-wide Pleistocene caldera forms an arcuate ridge across a flat caldera-floor moat NE of the Hakkoda group volcanoes, which bury the SE caldera wall. This view looks from the west towards a northern group of volcanoes, constructed within the caldera. Akakura-dake, Ido-dake, and Hakkoda-Otake (left to right) have well-preserved craters. No historical eruptions are known of the Hakkoda group.

Photo by Takashi Kudo, 1996 (Hokkaido University).
See title for photo information.
The 1552-m-high Takada-Otake, seen here from Suren swamp to its south, is one a group of stratovolcanoes and lava domes forming Hakkoda volcano in northernmost Honshu. Takada-Otake and other nearby volcanoes form a northern group of volcanoes that were constructed within an 8-km-wide caldera. The northern group appears to be younger than a southern volcano group that buries the southern caldera wall.

Photo by Takashi Kudo, 1996 (Hokkaido University).
See title for photo information.
The Hakkoda volcano group forms the skyline SE of the northern Honshu city of Aomori. A group of stratovolcanoes and lava domes was constructed within an 8-km-wide caldera. From left to right, the peaks are Takada-Otake, Akakura-dake, Ido-dake, and Hakkoda-Otake (the highest peak of the complex, at the right center). No historical eruptions are known from the Hakkoda group, although an active fumarolic area and hot springs are present.

Photo by Hisashi Sasaki, 1996 (Hokkaido University).
See title for photo information.

Smithsonian Sample Collections Database


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

Affiliated Sites