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Iwakisan

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

  • 1625 m
    5330 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 29 Holocene eruptive periods.

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1863 Mar 23 Unknown Confirmed 1 Historical Observations
[ 1856 May 20 ] [ Unknown ] Uncertain 2  
[ 1848 Jan 18 ] [ Unknown ] Uncertain 2  
1845 Apr 4 Unknown Confirmed 2 Historical Observations
1844 Apr 7 Unknown Confirmed 2 Historical Observations Summit and south flank?
[ 1833 Apr 11 ] [ Unknown ] Uncertain 2  
[ 1807 Mar 31 ] [ Unknown ] Uncertain 2  
[ 1800 May 11 ] [ Unknown ] Uncertain 2  
[ 1794 Apr 3 ] [ Unknown ] Uncertain 2  
[ 1793 Apr 2 ] [ Unknown ] Uncertain 2  
1790 Oct 9 Unknown Confirmed 2 Historical Observations
[ 1783 Dec 3 ] [ Unknown ] Uncertain 2  
1782 Dec 1 ± 30 days 1783 Mar 12 Confirmed 2 Historical Observations
[ 1782 Apr 12 ] [ Unknown ] Uncertain 2   South flank
[ 1769 ] [ Unknown ] Uncertain 2  
[ 1709 Apr 23 ] [ Unknown ] Uncertain 2  
[ 1694 Jun 19 ] [ Unknown ] Uncertain 2  
[ 1672 Jul 12 ] [ 1672 Jul 28 ] Uncertain 2  
1618 Jan 31 Unknown Confirmed 2 Historical Observations
[ 1605 Apr 10 ] [ Unknown ] Uncertain 2  
1604 Feb 7 Unknown Confirmed 3 Historical Observations Torinoumi
1600 Jul 23 1600 Jul 25 Confirmed 2 Historical Observations Torinoumi
1600 Feb 22 Unknown Confirmed 2 Historical Observations Torinoumi
[ 1597 Jun 13 ] [ Unknown ] Uncertain 2  
[ 1597 Jan ] [ Unknown ] Uncertain 2  
0550 BCE ± 500 years Unknown Confirmed   Tephrochronology Torinoumi lava dome
1050 BCE (?) Unknown Confirmed   Tephrochronology Summit and central lava dome
4050 BCE (?) Unknown Confirmed   Tephrochronology West summit lava dome
8050 BCE (?) Unknown Confirmed   Potassium-Argon Torinoumi lava dome
Deformation History

There is no Deformation History data available for Iwakisan.

Emission History

There is no Emissions History data available for Iwakisan.

Photo Gallery

The irregular summit lava dome filling the central crater of Iwaki volcano forms the high point in this view of the SE side of the volcano. Chokai-san is the rounded peak on the left. The summit lava dome is flanked by six explosion craters. Debris-avalanche deposits from repeated collapse of the summit and flanks surround the volcano on all sides. Historical eruptions have been reported since 1597 and have consisted primarily of small-to-moderate phreatic explosions.

Copyrighted photo by Shingo Takeuchi (Japanese Quaternary Volcanoes database, RIODB, http://riodb02.ibase.aist.go.jp/strata/VOL_JP/EN/index.htm and Geol Surv Japan, AIST, http://www.gsj.jp/).
See title for photo information.
Snow-capped Iwaki stratovolcano rises above farmlands below its SE flank. The peak at the left side of the summit is Chokai-san. Iwaki volcano, symmetrical on all but its western flanks, has been called the Fuji-san of the Tsugaru district. The 2-km-wide summit crater is filled by a lava dome that forms the high point of the volcano. Historical eruptions have been reported since 1597 and have consisted primarily of small-to-moderate phreatic explosions.

Copyrighted photo by Yoshihiro Ishizuka (Japanese Quaternary Volcanoes database, RIODB, http://riodb02.ibase.aist.go.jp/strata/VOL_JP/EN/index.htm and Geol Surv Japan, AIST, http://www.gsj.jp/).
See title for photo information.
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, 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
Publisher: Soviet Ministry
Country: USSR
Year: 1984
Series: B1754
Map Type: Topographic
Scale: 1:2,500,000
Map of
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: 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: Hakodate
Publisher: US Army Map Service
Country: Japan
Year: 1954
Series: AMS
Map Type: Topographic
Scale: 1:250,000
Map of Hakodate
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 --
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