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Mashu

Photo of this volcano
  • Japan
  • Japan, Taiwan, Marianas
  • Caldera
  • 1080 CE
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 43.572°N
  • 144.561°E

  • 857 m
    2812 ft

  • 285081
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Mashu.

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

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

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 7 Holocene eruptive periods.

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1080 ± 100 years Unknown Confirmed 5 Radiocarbon (corrected) Kamuinupuri, Tephra layer Ma-b
0350 ± 100 years Unknown Confirmed 2 Radiocarbon (corrected) Kamuinupuri, Tephra layer Ma-c1
0150 ± 100 years Unknown Confirmed 4 Radiocarbon (corrected) Kamuinupuri, Tephra layers Ma-c4-c2
2050 BCE ± 40 years Unknown Confirmed 4 Radiocarbon (corrected) Kamuinupuri, Tephra layer Ma-d
2800 BCE ± 750 years Unknown Confirmed 3 Tephrochronology Kamuinupuri, Tephra layer Ma-e'
3550 BCE ± 40 years Unknown Confirmed 4 Radiocarbon (corrected) Kamuinupuri, Tephra layer Ma-e
5550 BCE ± 100 years Unknown Confirmed 6 Radiocarbon (corrected) Tephra layers Ma-j-f
Deformation History

There is no Deformation History data available for Mashu.

Emission History

There is no Emissions History data available for Mashu.

Photo Gallery

Kamuinupuri is a small stratovolcano constructed on the SE rim of Mashu caldera. Growth of Kamuinupuri postdated the roughly 7,000-year-old caldera collapse. The steep scarp below the summit is the NE wall of a 1.2 x 1.5 km caldera that formed at the summit about 1,000 years ago.

Photo by Lee Siebert, 1977 (Smithsonian Institution).
See title for photo information.
Mashu is a 6-km-wide caldera on the northernmost Japanese island of Hokkaido, seen here from the SW rim with the Kamuishi Island lava dome in the center of the lake. It truncates a stratovolcano on the ESE rim of the larger Kutcharo caldera. The latest eruption of Mashu took place about 1,000 years from Kamuinupuri, the lower flanks of which appear to the far-right.

Photo by Lee Siebert, 1977 (Smithsonian Institution).
See title for photo information.
The deep blue waters of 6-km-wide Mashu caldera are seen here from its western rim. The small island of Kamuishu in the center of Lake Mashu (right-center) is the tip of a mostly submerged lava dome. Mashu is a Holocene caldera of a volcano constructed on the ESE rim of the Kussharo caldera. Following caldera collapse, Kamuinupuri (whose lower flanks are visible at the far right) formed beginning about 4,000 years ago.

Copyrighted photo by Shun Nakano, 2001 (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: 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

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

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

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

Title: Nemuro
Publisher: US Army Map Service
Country: Japan
Year: 1942
Series: AMS
Map Type: Topographic
Scale: 1:1,000,000
Map of Nemuro
Smithsonian Sample Collections Database

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

External Sites