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Zaozan

Photo of this volcano
  • Japan
  • Japan, Taiwan, Marianas
  • Complex
  • 1940 CE
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 38.144°N
  • 140.44°E

  • 1841 m
    6040 ft

  • 283190
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number
Most Recent Weekly Report: 24 January-30 January 2018 Citation IconCite this Report

JMA reported that tremor was detected at Zaozan on 28 and 30 January, and minor inflation at the S part of the volcano was recorded. There were 12 volcanic earthquakes detected on 31 January. JMA raised the Alert level to 2 (on a 5-level scale), noting the increased potential for a small eruption.

Source: Japan Meteorological Agency (JMA)


Most Recent Bulletin Report: September 1992 (BGVN 17:09) Citation IconCite this Report

Earthquake and numerous aftershocks, but no surface changes evident

A seismic shock of M 4.7 occurred at 1758 on 1 September a few kilometers ESE of the summit. The shock was felt at JMA intensity IV near the volcano, and was weakly felt at Sendai (35 km E), Fukushima (45 km S), and Onahama (135 km E). Aftershocks were numerous, but declined toward mid-September. The high seismicity was the first at the volcano since July 1990, when there were many small earthquakes below the summit. Surveys of fumarolic areas on 5 September revealed no changes in temperature from the last survey in 1990.

Information Contacts: JMA.

Weekly Reports - Index


2018: January


24 January-30 January 2018 Citation IconCite this Report

JMA reported that tremor was detected at Zaozan on 28 and 30 January, and minor inflation at the S part of the volcano was recorded. There were 12 volcanic earthquakes detected on 31 January. JMA raised the Alert level to 2 (on a 5-level scale), noting the increased potential for a small eruption.

Source: Japan Meteorological Agency (JMA)


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.

09/1992 (BGVN 17:09) Earthquake and numerous aftershocks, but no surface changes evident




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


September 1992 (BGVN 17:09) Citation IconCite this Report

Earthquake and numerous aftershocks, but no surface changes evident

A seismic shock of M 4.7 occurred at 1758 on 1 September a few kilometers ESE of the summit. The shock was felt at JMA intensity IV near the volcano, and was weakly felt at Sendai (35 km E), Fukushima (45 km S), and Onahama (135 km E). Aftershocks were numerous, but declined toward mid-September. The high seismicity was the first at the volcano since July 1990, when there were many small earthquakes below the summit. Surveys of fumarolic areas on 5 September revealed no changes in temperature from the last survey in 1990.

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 52 Holocene eruptive periods.

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1940 May 18 1940 May 18 Confirmed 1 Historical Observations Okama
[ 1939 Jul ] [ Unknown ] Uncertain 1   Okama
[ 1927 ] [ Unknown ] Uncertain 1   Okama
[ 1906 ] [ Unknown ] Discredited    
1905 Unknown Confirmed 1 Historical Observations Okama
[ 1897 Jan 14 ] [ 1897 Jan 14 ] Uncertain 1   Okama
[ 1896 Sep 1 (?) ] [ Unknown ] Uncertain 1   Okama
1896 Mar 8 1896 Mar 8 Confirmed 1 Historical Observations Okama
1895 Aug 22 1895 Sep 28 Confirmed 2 Historical Observations Okama
1895 Feb 15 1895 Mar 22 Confirmed 1 Historical Observations Okama
1894 Jul 3 1894 Jul 3 Confirmed 2 Historical Observations Okama
[ 1890 ] [ Unknown ] Uncertain 1   Okama
1873 Aug 1873 Sep Confirmed 1 Historical Observations Okama
1867 Oct 21 Unknown Confirmed 2 Historical Observations Okama
1833 Unknown Confirmed 2 Historical Observations Okama
1831 Nov 22 Unknown Confirmed 2 Historical Observations Okama
1830 Unknown Confirmed 2 Historical Observations Okama
1822 May 1 Unknown Confirmed   Historical Observations
1821 Jan 27 1821 May 1 Confirmed 2 Historical Observations Okama
1809 Jun 12 1809 Dec 29 Confirmed 2 Historical Observations Okama
1806 Jul 12 Unknown Confirmed 2 Historical Observations Okama
1804 May (?) Unknown Confirmed 2 Historical Observations Okama
1796 Mar 24 Unknown Confirmed 2 Historical Observations Okama
1794 Sep 22 1794 Dec (in or after) Confirmed 2 Historical Observations SE side of Okama
1694 May 29 1694 Aug 30 (?) Confirmed 2 Historical Observations Okama
1670 Apr 26 1670 Sep 26 Confirmed 2 Historical Observations Okama
1669 Unknown Confirmed 3 Historical Observations Okama
1668 Aug Unknown Confirmed 2 Historical Observations Okama
1641 Unknown Confirmed 2 Historical Observations Okama
1630 Unknown Confirmed 2 Historical Observations Okama
1623 May 15 (?) 1624 Nov 15 (?) Confirmed 3 Historical Observations Okama
1622 Unknown Confirmed 2 Historical Observations Okama
1620 Unknown Confirmed 2 Historical Observations Okama
1400 ± 100 years Unknown Confirmed 3 Radiocarbon (corrected) Goshiki-dake area, Z-To11 tephra
[ 1350 (?) ] [ Unknown ] Uncertain 2   Okama
[ 1331 ] [ 1333 ] Uncertain 2   Okama
1230 Nov 29 (?) Unknown Confirmed 2 Historical Observations Okama
1227 Oct (?) Unknown Confirmed 3 Historical Observations Okama
1183 May 28 (?) Unknown Confirmed 2 Historical Observations Okama
0884 (?) Unknown Confirmed 3 Historical Observations Okama, Z-To10 tephra?
[ 0773 Nov (?) ] [ Unknown ] Uncertain     Okama
0300 ± 200 years Unknown Confirmed 4 Radiocarbon (corrected) Goshiki-dake area, Z-To9 tephra
1600 BCE (?) Unknown Confirmed   Radiocarbon (corrected) Goshiki-dake
2000 BCE ± 500 years Unknown Confirmed   Tephrochronology Goshiki-dake
2300 BCE ± 75 years Unknown Confirmed   Radiocarbon (corrected) Goshiki-dake area, Z-To8 tephra
2600 BCE ± 200 years Unknown Confirmed   Radiocarbon (corrected) Goshiki-dake area, Z-To7 tephra
3350 BCE ± 50 years Unknown Confirmed   Radiocarbon (corrected) Goshiki-dake area, Z-To6 tephra
3850 BCE ± 200 years Unknown Confirmed   Radiocarbon (corrected) Goshiki-dake area, Z-To5 tephra
4150 BCE ± 200 years Unknown Confirmed   Radiocarbon (corrected) Goshiki-dake area, Z-To5b tephra
5500 BCE (?) Unknown Confirmed   Radiocarbon (corrected) Goshiki-dake area
5600 BCE (?) Unknown Confirmed   Radiocarbon (corrected) Goshiki-dake, Z-To5a tephra
7600 BCE (?) Unknown Confirmed   Radiocarbon (corrected) Goshiki-dake area
Deformation History

There is data available for 1 deformation periods. Expand each entry for additional details.


Deformation during 2011 Mar 11 - 2011 Mar 11 [Subsidence; Observed by InSAR]

Start Date: 2011 Mar 11 Stop Date: 2011 Mar 11 Direction: Subsidence Method: InSAR
Magnitude: 8.000 cm Spatial Extent: 20.00 km Latitude: 38.000 Longitude: 140.000

Remarks: Subsidence of plutonic bodies triggered by Mw 9.0 Tohoku earthquake

Figure (see Caption)

Close-up interferograms. Blue squares indicate geothermal power plants. GEONET stations are indicated by numbered circles, with the colour inside indicating the GPS displacements in the LOS direction.

From: Takada and Fukushima 2013.


Reference List: Takada and Fukushima 2013; Ozawa and Fujita 2013.

Full References:

Ozawa T, Fujita E, 2013. Local deformations around volcanoes associated with the 2011 off the Pacific coast of Tohoku earthquake. J. Geophys. Res., 118, 390-405. https://doi.org/10.1029/2011JB009129

Takada and Fukushima, 2013. Volcanic subsidence triggered by the 2011 Tohoku earthquake in Japan. Nature Geoscience, 6: 637-641.

Emission History

There is no Emissions History data available for Zaozan.

Photo Gallery

Okama crater of Goryu-dake, the most well-known feature of the Zao volcanic complex, is seen from the east. The 360-m-wide lake is about 60 m deep. The volcanic lake has been the site of many historical eruptions. White mud deposited on the lake floor is periodically disturbed by gas emission, changing the color of the lake water. The Zao volcano group, the most active of northern Honshu, consists of a complex cluster of stratovolcanoes straddling the Pacific Ocean-Japan Sea divide.

Copyrighted photo by Yoshihisa Kawanabe (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: 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: (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: (B) Q Maps of Japan Landforms, Geol, Tect: Central
Publisher: Univ of Tokyo Press & Japan Association for Quaternary Research
Country: Japan
Year: 1987
Map Type: Geology
Scale: 1:1,000,000
Map of (B) Q Maps of Japan Landforms, Geol, Tect: Central
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
Publisher: Soviet Ministry
Country: USSR
Year: 1984
Series: B1754
Map Type: Topographic
Scale: 1:2,500,000
Map of
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: Central 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 Central Japan
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: Central Japan
Publisher: Geographical Survey Institute of Japan
Country: Japan
Year: 1980
Map Type: Topographic
Scale: 1:1,000,000
Map of Central Japan
Title: Central Japan
Publisher: Geographical Survey Institute of Japan
Country: Japan
Year: 1980
Map Type: Topographic
Scale: 1:1,000,000
Map of Central 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: 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: Central Japan
Publisher: Geographical Survey Institute of Japan
Country: Japan
Year: 1966
Map Type: Topographic
Scale: 1:1,000,000
Map of Central Japan
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: Sendai
Publisher: US Army Map Service
Country: Japan
Year: 1954
Series: AMS
Map Type: Topographic
Scale: 1:250,000
Map of Sendai
Title: Numasawa-Numa
Publisher: US Army Map Service
Country: Japan
Year: 1945
Series: AMS
Map Type: Topographic
Scale: 1:250,000
Map of Numasawa-Numa
Title: Sendai
Publisher: US Army Map Service
Country: Japan
Year: 1943
Series: AMS
Map Type: Topographic
Scale: 1:1,000,000
Map of Sendai
Smithsonian Sample Collections Database

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

Affiliated Sites