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Niigata-Yakeyama

Photo of this volcano
  • Country
  • Volcanic Region
  • Landform | Volc Type
  • Last Known Eruption
  • 36.921°N
  • 138.036°E

  • 2,400 m
    7,874 ft

  • 283090
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number


Most Recent Bulletin Report: December 1992 (BGVN 17:12) Citation IconCite this Report

Steam emission unchanged

Steady white steam emission to heights of 30-250 m from vents near the summit continued through 1992, almost unchanged from previous years.

Information Contacts: JMA.

The Global Volcanism Program has no Weekly Reports available for Niigata-Yakeyama.

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.

07/1974 (CSLP 96-74) Eruption on 28 July causes ashfall over a wide area

08/1974 (CSLP 96-74) Activity continuing from near summit and W-flank fissure

04/1983 (SEAN 08:04) Fresh ash on snow

09/1987 (SEAN 12:09) Small ash eruption; fuming

10/1987 (SEAN 12:10) Increased fume from summit, decrease from flank

04/1989 (SEAN 14:04) Increased steaming, small ash eruption

12/1991 (BGVN 16:12) Increased steaming

12/1992 (BGVN 17:12) Steam emission unchanged




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


July 1974 (CSLP 96-74)

Eruption on 28 July causes ashfall over a wide area

Card 1895 (29 July 1974) Eruption on 28 July causes ashfall over a wide area

Mt. Yakeyama, which began erupting on 28 July, continues to belch smoke, spreading ashes over a wide area of Niigata Prefecture. The . . . mountain erupted at 0250 JST on 28 July for the first time in 25 years. Between 0.5 and 1 cm of ashes fell on cities and towns in the prefecture, including Joetsu and Arai. It was feared that mulberry trees, leaf tobacco, and vegetables had been seriously damaged by the ashes, and a helicopter was flown over the area to view the eruption and make a survey of the agricultural damage.

Information Contacts: Seismological Division, Japan Meteorological Agency (JMA).


August 1974 (CSLP 96-74)

Activity continuing from near summit and W-flank fissure

Card 1904 (12 August 1974) Activity continuing from near summit and W-flank fissure

Mt. Yakeyama . . . continues to emit white smoke (figure 1). Except for minor activity, this is the first eruption in 25 years. The eruptions have been occurring in or near the summit crater of the lava dome, and most of the smoke is issuing from a 200-300-m-long fissure on the western flank of the lava dome. A survey team determined that a mudflow began at the upper reaches of the Hayakawa stream, and trees near the fissure crater were washed away. Three mountain-climbing students from the Chiba University, who were camped near the fissure crater, were killed by ejected fragments or poisonous gases.

Figure (see Caption) Figure 1. Photograph showing white emissions from the flank of the central lava dome at Niigata-Yake-yama on 3 August 1974, three days after the first explosion. Courtesy of JMA.

Information Contacts: Seismological Division, JMA.


April 1983 (SEAN 08:04) Citation IconCite this Report

Fresh ash on snow

On the morning of 15 April, a local resident noticed gray-tinted snow on the N flank and a plume near the summit area. On 18 April, a joint observation team from the firehouse, the district forestry office, and the city office of [Itoigawa] (20 km NE of the volcano), visited the summit area and found that ash had fallen on the snow over the N flank. Analysis of an ash sample at Niigata University showed that the ash was not freshly magmatic, but was composed of fragmented old rock that contained mainly plagioclase, amphibole, and pyroxene phenocrysts. No seismic activity was recorded, but no JMA seismograph is installed within 30 km of the volcano.

The volcano is a 400-m-high lava dome that rests on 2,000-m-high mountains underlain by sedimentary rock. During its last eruption, a phreatic explosion from fissures in the N and W flanks [near the summit] on 28 July 1974, three climbers were killed by ejecta, ash fell as far as 100 km to the NE damaging about 220 km2 of farmland, and two mudflows descended the N flank.

Information Contacts: JMA, Tokyo.


September 1987 (SEAN 12:09) Citation IconCite this Report

Small ash eruption; fuming

A small ash ejection is presumed to have occurred between late April and 1 May when brown snow was observed on the flank. At 1000 on 2 May fume clouds were rising 30-50 m from the NE part of the summit. Plume height reached 100 m on 4 May, and on 19 May 100-150-m-high clouds issued from three sites on the NE flank and one site on the SE flank. Similar activity was seen on 27 May, when seven sites were active; two emitted grayish fume and had yellow sublimates.

On 8 June fuming continued from one site at the summit and two sites on the upper NE flank, but at lesser volumes than in May. By 18 June the fume reached only 20-30 m. When observed on 19, 23, and 29 July, clouds rose 70-100 m from 2-3 sites on the upper NE flank and in the summit region. Eight fuming sites were visible on 7 August from the foot of the mountain and small amounts of white fume were rising 50-70 m. Observations on 7 and 11 August showed discoloration in the area from the summit to the upper E flank.

Information Contacts: Y. Sawada, JMA; D. Shackelford, Fullerton, CA.


October 1987 (SEAN 12:10) Citation IconCite this Report

Increased fume from summit, decrease from flank

Observations from the N foot of the volcano (8 km from the crater) on 7 September showed that the fuming from the upper NE flank was continuing. Summit fuming had visibly increased since 7 August observations, but fuming from the upper NE flank had decreased in volume. On 14 and 24 September, white vapors were seen rising from the E flank.

Information Contacts: Y. Sawada, JMA; D. Shackelford, Fullerton, CA.


April 1989 (SEAN 14:04) Citation IconCite this Report

Increased steaming, small ash eruption

A white steam plume was rising from the volcano's upper E flank during observations by the staff of Takada Weather Station (from sites 10-20 km away) 1 May 1987-September 1988. Emissions gradually declined, and after a 9 November 1988 visit, no plume was observed.

Moderate steam emission was seen again on 30 March 1989, with a white vapor plume rising 100-150 m from 2 areas on the upper E flank. Steam from the upper NE flank rose about 30-50 m on 15 April. Four days later, steam with a small amount of ash was emitted to about 100-150 m above the upper E flank, the first sighting of a gray plume since May 1987. Observations from Sasagamine (about 8 km SE) on 26 April revealed gray plumes rising 250-300 m from many sites on the upper E flank. A 30 April steam plume, about 300-400 m high and blown 600 m by the wind (figure 2), was the highest since May 1987. Access to the volcano has been closed to tourists.

Figure (see Caption) Figure 2. Height of steam plumes at Niigata-Yake-yama, 1987-91. Courtesy of JMA.

Information Contacts: JMA.


December 1991 (BGVN 16:12) Citation IconCite this Report

Increased steaming

Steaming from vents near the summit has increased slightly since October. A seismometer installed near the volcano on 20 December recorded only 1 weak earthquake by 16 January. Steam emission has continued since late April 1987 (figure 1), when a small ash ejection occurred. Larger plumes in April 1989 also included ash.

Information Contacts: JMA.


December 1992 (BGVN 17:12) Citation IconCite this Report

Steam emission unchanged

Steady white steam emission to heights of 30-250 m from vents near the summit continued through 1992, almost unchanged from previous years.

Information Contacts: JMA.

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 20 confirmed Holocene eruptive periods.

1998 Mar 30 Confirmed Eruption VEI: 1

Episode 1 | Eruption Upper east flank
1998 Mar 30 - Unknown Evidence from Observations: Reported

List of 3 Events for Episode 1 at Upper east flank

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity
   - - - -    - - - - Ash weak or small
1998 Mar 30    - - - - VEI (Explosivity Index)

1997 Oct 29 - 1997 Dec 10 Confirmed Eruption VEI: 1

Episode 1 | Eruption Upper east flank
1997 Oct 29 - 1997 Dec 10 Evidence from Observations: Reported

List of 3 Events for Episode 1 at Upper east flank

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity
   - - - -    - - - - Ash weak or small
1997 Oct 29    - - - - VEI (Explosivity Index)

1989 Apr 19 - 1989 Apr 26 Confirmed Eruption VEI: 1

Episode 1 | Eruption Upper East flank
1989 Apr 19 - 1989 Apr 26 Evidence from Observations: Reported

List of 3 Events for Episode 1 at Upper East flank

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity
   - - - -    - - - - Ash
1989 Apr 19    - - - - VEI (Explosivity Index)

1987 Apr 25 ± 5 days Confirmed Eruption VEI: 1

Episode 1 | Eruption
1987 Apr 25 ± 5 days - Unknown Evidence from Observations: Reported

List of 3 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity Uncertain
   - - - -    - - - - Ash weak or small
1987 Apr 25 ± 5 days    - - - - VEI (Explosivity Index)

1983 Apr 14 (?) - 1983 Apr 15 (?) Confirmed Eruption VEI: 1

Episode 1 | Eruption
1983 Apr 14 (?) - 1983 Apr 15 (?) Evidence from Observations: Reported

List of 3 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity weak or small
   - - - -    - - - - Ash
1983 Apr 14
(?)
   - - - - VEI (Explosivity Index)

1974 Jul 28 - 1974 Jul 28 Confirmed Eruption VEI: 2

Episode 1 | Eruption WNW and NNE side of lava dome
1974 Jul 28 - 1974 Jul 28 Evidence from Observations: Reported

List of 7 Events for Episode 1 at WNW and NNE side of lava dome

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity moderate
   - - - -    - - - - Pyroclastic flow
   - - - -    - - - - Ash
   - - - -    - - - - Lahar or Mudflow moderate
   - - - -    - - - - Property Damage
1974 Jul 28    - - - - Fatalities
1974 Jul 28    - - - - VEI (Explosivity Index)

1963 Jul 10 - 1963 Sep 30 Confirmed Eruption VEI: 1

Episode 1 | Eruption
1963 Jul 10 - 1963 Sep 30 Evidence from Observations: Reported

List of 2 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity
1963 Jul 10    - - - - VEI (Explosivity Index)

1963 Feb 14 Confirmed Eruption VEI: 1

Episode 1 | Eruption
1963 Feb 14 - Unknown Evidence from Observations: Reported

List of 2 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity
1963 Feb 14    - - - - VEI (Explosivity Index)

1962 Mar 14 - 1962 Mar 14 Confirmed Eruption VEI: 1

Episode 1 | Eruption
1962 Mar 14 - 1962 Mar 14 Evidence from Observations: Reported

List of 3 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity
   - - - -    - - - - Ash
1962 Mar 14    - - - - VEI (Explosivity Index)

1949 Feb 5 - 1949 Sep 13 Confirmed Eruption VEI: 2

Episode 1 | Eruption NE-SW fissures, both sides of summit
1949 Feb 5 - 1949 Sep 13 Evidence from Observations: Reported

List of 6 Events for Episode 1 at NE-SW fissures, both sides of summit

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Seismicity (volcanic) Before eruption.
   - - - -    - - - - Seismicity (volcanic)
   - - - -    - - - - Phreatic activity
   - - - -    - - - - Ash
   - - - -    - - - - Lahar or Mudflow
1949 Feb 5    - - - - VEI (Explosivity Index)

1854 Confirmed Eruption  

Episode 1 | Eruption NW flank
1854 - Unknown Evidence from Observations: Reported

List of 1 Events for Episode 1 at NW flank

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity Uncertain

1852 Nov 1 - 1853 May (?) Confirmed Eruption VEI: 2

Episode 1 | Eruption NW flank
1852 Nov 1 - 1853 May (?) Evidence from Observations: Reported

List of 4 Events for Episode 1 at NW flank

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Phreatic activity
   - - - -    - - - - Audible Sounds
1852 Nov 1    - - - - VEI (Explosivity Index)

1773 Confirmed Eruption VEI: 3

Episode 1 | Eruption Koyaike Ash; tephra layer KG-a
1773 - Unknown Evidence from Observations: Reported

List of 5 Events for Episode 1 at Koyaike Ash; tephra layer KG-a

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Pyroclastic flow
   - - - -    - - - - Lahar or Mudflow
   - - - -    - - - - Property Damage
1773    - - - - VEI (Explosivity Index)

1361 Confirmed Eruption VEI: 3

Episode 1 | Eruption Koyaike Ash; tephra layer KG-b
1361 - Unknown Evidence from Observations: Reported

List of 7 Events for Episode 1 at Koyaike Ash; tephra layer KG-b

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Pyroclastic flow
   - - - -    - - - - Lava flow
   - - - -    - - - - Lava dome
   - - - -    - - - - Lahar or Mudflow
   - - - -    - - - - Property Damage
1361    - - - - VEI (Explosivity Index)

0989 Confirmed Eruption  

Episode 1 | Eruption Koyaike Ash; tephra layer KG-c?
0989 - Unknown Evidence from Observations: Reported

List of 3 Events for Episode 1 at Koyaike Ash; tephra layer KG-c?

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Pyroclastic flow Uncertain
   - - - -    - - - - Ash

0887 Confirmed Eruption VEI: 4

Episode 1 | Eruption Koyaike Ash; tephra layer KG-c
0887 - Unknown Evidence from Observations: Reported

List of 7 Events for Episode 1 at Koyaike Ash; tephra layer KG-c

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Pyroclastic flow
   - - - -    - - - - Lava flow
   - - - -    - - - - Earthquakes (undefined)
   - - - -    - - - - Lahar or Mudflow
   - - - -    - - - - Property Damage
0887    - - - - VEI (Explosivity Index)

0813 (?) Confirmed Eruption  

Episode 1 | Eruption
0813 (?) - Unknown Evidence from Observations: Reported

List of 4 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Phreatic activity
   - - - -    - - - - Pyroclastic flow
   - - - -    - - - - Lava flow

0700 BCE ± 100 years Confirmed Eruption VEI: 3

Episode 1 | Eruption Koyaike Ash; tephra layer KG-d
0700 BCE ± 100 years - Unknown Evidence from Isotopic: 14C (calibrated)

List of 3 Events for Episode 1 at Koyaike Ash; tephra layer KG-d

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Pyroclastic flow
0700 BCE ± 100 years    - - - - VEI (Explosivity Index)

1750 BCE (?) Confirmed Eruption  

Episode 1 | Eruption
1750 BCE (?) - Unknown Evidence from Isotopic: 14C (calibrated)

List of 4 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Pyroclastic flow
   - - - -    - - - - Lava flow
   - - - -    - - - - Lahar or Mudflow

1900 BCE ± 1050 years Confirmed Eruption  

Episode 1 | Eruption Koyaike Ash; tephra layer KG-e
1900 BCE ± 1050 years - Unknown Evidence from Correlation: Tephrochronology

List of 6 Events for Episode 1 at Koyaike Ash; tephra layer KG-e

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Pyroclastic flow
   - - - -    - - - - Lava flow
   - - - -    - - - - Lava dome
   - - - -    - - - - Ash
   - - - -    - - - - Lahar or Mudflow
Deformation History

There is no Deformation History data available for Niigata-Yakeyama.

Emission History

There is no Emissions History data available for Niigata-Yakeyama.

GVP Map Holdings

Maps are not currently available due to technical issues.

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.

Smithsonian Sample Collections Database

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

External Sites