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Iwakisan

Photo of this volcano
  • Japan
  • Stratovolcano
  • 1863 CE
  •  
  • Country
  • Primary Volcano Type
  • Last Known Eruption
  •  
  • 40.656°N
  • 140.303°E

  • 1625 m
    5331 ft

  • 283270
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Iwakisan.

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

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

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 13 confirmed Holocene eruptive periods.

1863 Mar 23 Confirmed Eruption Max VEI: 1

Episode 1 | Eruption Episode
1863 Mar 23 - Unknown Evidence from Observations: Reported

List of 3 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity weak or small
   - - - -    - - - - Blocks
1863 Mar 23    - - - - VEI (Explosivity Index)

[ 1856 May 20 ] Uncertain Eruption

[ 1848 Jan 18 ] Uncertain Eruption

1845 Apr 4 Confirmed Eruption Max VEI: 2

Episode 1 | Eruption Episode
1845 Apr 4 - Unknown Evidence from Observations: Reported

List of 2 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity weak or small
1845 Apr 4    - - - - VEI (Explosivity Index)

1844 Apr 7 Confirmed Eruption Max VEI: 2

Episode 1 | Eruption Episode Summit and south flank?
1844 Apr 7 - Unknown Evidence from Observations: Reported

List of 4 Events for Episode 1 at Summit and south flank?

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity weak or small
   - - - -    - - - - Avalanche Uncertain
   - - - -    - - - - Audible Sounds
1844 Apr 7    - - - - VEI (Explosivity Index)

[ 1833 Apr 11 ] Uncertain Eruption

[ 1807 Mar 31 ] Uncertain Eruption

[ 1800 May 11 ] Uncertain Eruption

[ 1794 Apr 3 ] Uncertain Eruption

[ 1793 Apr 2 ] Uncertain Eruption

1790 Oct 9 Confirmed Eruption Max VEI: 2

Episode 1 | Eruption Episode
1790 Oct 9 - Unknown Evidence from Observations: Reported

List of 3 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity
   - - - -    - - - - Ash
1790 Oct 9    - - - - VEI (Explosivity Index)

[ 1783 Dec 3 ] Uncertain Eruption

1782 Dec 1 ± 30 days - 1783 Mar 12 Confirmed Eruption Max VEI: 2

Episode 1 | Eruption Episode
1782 Dec 1 ± 30 days - 1783 Mar 12 Evidence from Observations: Reported

List of 3 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity
   - - - -    - - - - Crater Summit.
1782 Dec 1 ± 30 days    - - - - VEI (Explosivity Index)

[ 1782 Apr 12 ] Uncertain Eruption

[ 1769 ] Uncertain Eruption

[ 1709 Apr 23 ] Uncertain Eruption

[ 1694 Jun 19 ] Uncertain Eruption

[ 1672 Jul 12 - 1672 Jul 28 ] Uncertain Eruption

1618 Jan 31 Confirmed Eruption Max VEI: 2

Episode 1 | Eruption Episode
1618 Jan 31 - Unknown Evidence from Observations: Reported

List of 3 Events for Episode 1

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity Uncertain
   - - - -    - - - - Ash
1618 Jan 31    - - - - VEI (Explosivity Index)

[ 1605 Apr 10 ] Uncertain Eruption

1604 Feb 7 Confirmed Eruption Max VEI: 3

Episode 1 | Eruption Episode Torinoumi
1604 Feb 7 - Unknown Evidence from Observations: Reported

List of 3 Events for Episode 1 at Torinoumi

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity
   - - - -    - - - - Lahar or Mudflow
1604 Feb 7    - - - - VEI (Explosivity Index)

1600 Jul 23 - 1600 Jul 25 Confirmed Eruption Max VEI: 2

Episode 1 | Eruption Episode Torinoumi
1600 Jul 23 - 1600 Jul 25 Evidence from Observations: Reported

List of 5 Events for Episode 1 at Torinoumi

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity
   - - - -    - - - - Earthquakes (undefined)
   - - - -    - - - - Lahar or Mudflow
   - - - -    - - - - Property Damage
1600 Jul 23    - - - - VEI (Explosivity Index)

1600 Feb 22 Confirmed Eruption Max VEI: 2

Episode 1 | Eruption Episode Torinoumi
1600 Feb 22 - Unknown Evidence from Observations: Reported

List of 3 Events for Episode 1 at Torinoumi

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity
   - - - -    - - - - Lahar or Mudflow
1600 Feb 22    - - - - VEI (Explosivity Index)

[ 1597 Jun 13 ] Uncertain Eruption

[ 1597 Jan ] Uncertain Eruption

0550 BCE ± 500 years Confirmed Eruption  

Episode 1 | Eruption Episode Torinoumi lava dome
0550 BCE ± 500 years - Unknown Evidence from Correlation: Tephrochronology

List of 1 Events for Episode 1 at Torinoumi lava dome

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Lava dome

1050 BCE (?) Confirmed Eruption  

Episode 1 | Eruption Episode Summit and central lava dome
1050 BCE (?) - Unknown Evidence from Correlation: Tephrochronology

List of 3 Events for Episode 1 at Summit and central lava dome

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Lava dome
   - - - -    - - - - Pumice

4050 BCE (?) Confirmed Eruption  

Episode 1 | Eruption Episode West summit lava dome
4050 BCE (?) - Unknown Evidence from Correlation: Tephrochronology

List of 4 Events for Episode 1 at West summit lava dome

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Lava dome
   - - - -    - - - - Ash
   - - - -    - - - - Pumice

8050 BCE (?) Confirmed Eruption  

Episode 1 | Eruption Episode Torinoumi lava dome
8050 BCE (?) - Unknown Evidence from Isotopic: K/Ar

List of 1 Events for Episode 1 at Torinoumi lava dome

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Lava dome
Deformation History

There is no Deformation History data available for Iwakisan.

Emission History

There is no Emissions History data available for Iwakisan.

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.


Title: Computer Generated Geologic Map of Japan
Publisher: Geological Survey of Japan
Country: Japan
Year: 1990
Series: No 22
Map Type: Geology
Scale: 1:2,000,000
Map of Computer Generated Geologic Map of Japan

Title: China, Japan, Soviet Union
Publisher: DMA Aerospace Center
Country: Japan, USSR, China
Year: 1988
Series: ONC
Map Type: Topographic
Scale: 1:1,000,000
Map of China, Japan, Soviet Union

Title: Japan, South Korea
Publisher: DMA Aerospace Center
Country: Japan, S Korea
Year: 1988
Series: ONC
Map Type: Topographic
Scale: 1:1,000,000
Map of Japan, South Korea

Title: Japan, Soviet Union
Publisher: DMA Aerospace Center
Country: Japan, USSR
Year: 1987
Series: TPC
Map Type: Topographic
Scale: 1:500,000
Map of Japan, Soviet Union

Title: (A) Q Maps of Japan Landforms, Geol, Tect: NEast
Publisher: Univ of Tokyo Press & Japan Association for Quaternary Research
Country: Japan
Year: 1987
Map Type: Geology
Scale: 1:1,000,000
Map of (A) Q Maps of Japan Landforms, Geol, Tect: NEast

Title: Japan
Publisher: DMA Aerospace Center
Country: Japan
Year: 1985
Series: TPC
Map Type: Topographic
Scale: 1:500,000
Map of Japan

Title: Historical Japan
Publisher: National Geographic Society
Country: Japan
Year: 1984
Series: National Geographic
Map Type: Geographic
Scale: 1:2,982,000
Map of Historical Japan

Title: Funakawa
Publisher: Geographical Survey Institute of Japan
Country: Japan
Year: 1983
Map Type: Topographic
Scale: 1:50,000
Map of Funakawa

Title: Geol Map of Japan/ Geol Atlas
Publisher: Geol Survey of Japan
Country: Japan
Year: 1982
Map Type: Geology
Scale: 1:1,000,000
Map of Geol Map of Japan/ Geol Atlas

Title: North Japan
Publisher: Geographical Survey Institute of Japan
Country: Japan
Year: 1980
Series: CIM 1:1 mil
Map Type: Topographic
Scale: 1:1,000,000
Map of North Japan

Title: North Japan
Publisher: Geographical Survey Institute of Japan
Country: Japan
Year: 1980
Map Type: Topographic
Scale: 1:1,000,000
Map of North Japan

Title: North Japan
Publisher: Geographical Survey Institute of Japan
Country: Japan
Year: 1980
Map Type: Topographic
Scale: 1:1,000,000
Map of North Japan

Title: Geological Map of Japan
Publisher: Geological Survey of Japan
Country: Japan
Year: 1978
Map Type: Geology
Scale: 1:1,000,000
Map of Geological Map of Japan

Title: Geological Map of Japan
Publisher: Geological Survey of Japan
Country: Japan
Year: 1978
Map Type: Geology
Scale: 1:1,000,000
Map of Geological Map of Japan

Title: Distribution Map of Hot Springs in Japan
Publisher: Geological Survey of Japan
Country: Japan
Year: 1975
Series: 1:2,000,000
Map Type: Unknown
Scale: 1:2,000,000
Map of Distribution Map of Hot Springs in Japan

Title: (Japanese) Geol map of Japan
Publisher: Geographical Survey Institute of Japan
Country: Japan
Year: 1974
Series: from Natl Atlas Japan
Map Type: Geology
Scale: 1:2,500,000
Map of (Japanese) Geol map of Japan

Title: Landform Classification
Publisher: Geographical Survey Institute of Japan
Country: Japan
Year: 1972
Series: from Natl Atlas Japan
Map Type: Unknown (Land)
Scale: 1:2,500,000
Map of Landform Classification

Title: Land Use
Publisher: Geographical Survey Institute of Japan
Country: Japan
Year: 1972
Series: from Natl Atlas Japan
Map Type: Unknown (Land)
Scale: 1:2,500,000
Map of Land Use

Title: Population Distribution
Publisher: Geographical Survey Institute of Japan
Country: Japan
Year: 1972
Series: from Natl Atlas Japan
Map Type: Unknown
Scale: 1:2,500,000
Map of Population Distribution

Title: River Systems
Publisher: Geographical Survey Institute of Japan
Country: Japan
Year: 1972
Series: from Natl Atlas Japan
Map Type: Unknown
Scale: 1:2,500,000
Map of River Systems

Title: North Japan
Publisher: Geographical Survey Institute of Japan
Country: Japan
Year: 1966
Map Type: Topographic
Scale: 1:1,000,000
Map of North Japan

Title: Aomori
Publisher: US Army Map Service
Country: Japan
Year: 1955
Series: AMS
Map Type: Topographic
Scale: 1:250,000
Map of Aomori

Title: Akita
Publisher: US Army Map Service
Country: Japan
Year: 1954
Series: AMS
Map Type: Topographic
Scale: 1:250,000
Map of Akita

Title: Sendai
Publisher: US Army Map Service
Country: Japan
Year: 1943
Series: AMS
Map Type: Topographic
Scale: 1:1,000,000
Map of Sendai

Title: Hakodate
Publisher: US Army Map Service
Country: Japan
Year: 1943
Series: AMS
Map Type: Topographic
Scale: 1:1,000,000
Map of Hakodate
Smithsonian Sample Collections Database

The following 2 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections, and may be availble for research (contact the Rock and Ore Collections Manager). Catalog number links will open a window with more information.

Catalog Number Sample Description Lava Source Collection Date
NMNH 101496 Unidentified IWAKI-SAN --
NMNH 101497 Dacite IWAKI-SAN --
External Sites