Global Volcanism Program | Shiretoko-Iozan

The Global Volcanism Program has no activity reports available for Shiretoko-Iozan.

The Global Volcanism Program has no Weekly Reports available for Shiretoko-Iozan.

The Global Volcanism Program has no Bulletin Reports available for Shiretoko-Iozan.

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.

Synonyms

Cones

Feature Name

Feature Type

Elevation

Latitude

Longitude

Nakadake
Naka-dake

Cone

Shiretoko-Iozan

Stratovolcano

Craters

Feature Name

Feature Type

Elevation

Latitude

Longitude

Chuhuku

Crater

Kitadake
Kita-dake

Crater

Minamidake
Minami-dake

Crater

Domes

Feature Name

Feature Type

Elevation

Latitude

Longitude

Namakoyama
Namako-yama

Dome

Nampo

Dome

Basic Data

Volcano Number

Last Known Eruption

Elevation

Latitude
Longitude

285090

1936 CE

1,562 m / 5,125 ft

44.133°N
145.161°E

Morphology

Volcano Landform
Composite

Volcano Types
Stratovolcano
Lava dome

Rock Types

Major
Andesite / Basaltic Andesite

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km

6
1,516
7,890
209,060

Geological Summary

Shiretoko-Iozan, one of many Japanese "sulfur mountains," is noted for the extrusion of molten sulfur during eruptions in 1889 and 1936. Located at the NE tip of Hokkaido on the Shiretoko Peninsula, the andesitic volcano contains two large craters at the summit that are breached to the NW. The southern crater contains a small flat-topped lava dome. The main cone, Nakadake, was constructed NW of the headwalls of the two breached craters. Historical eruptions have originated from the southernmost of three explosion craters along a NNE-SSW line on the NW flank of the main cone.

This volcano is located within the Shiretoko, a UNESCO World Heritage property.

References

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

Japan Meteorological Agency, 1996. National Catalogue of the Active Volcanoes in Japan (second edition). Tokyo: Japan Meteorological Agency, 502 p (in Japanese).

Japan Meteorological Agency, 2013. National Catalogue of the Active Volcanoes in Japan (fourth edition, English version). Japan Meteorological Agency.

Kudo T, Hoshizumi H, 2006-. Catalog of eruptive events within the last 10,000 years in Japan, database of Japanese active volcanoes. Geol Surv Japan, AIST, https://gbank.gsj.jp/volcano/index_e.htm.

Kuno H, 1962. Japan, Taiwan and Marianas. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 11: 1-332.

Murayama I, 1987. Volcanoes of Japan (I). Tokyo: Daimedo, 315 p (2nd edition, in Japanese).

Nakano S, Yamamoto T, Iwaya T, Itoh J, Takada A, 2001-. Quaternary Volcanoes of Japan. Geol Surv Japan, AIST, http://www.aist.go.jp/RIODB/strata/VOL_JP/.

Eruptive History

There is data available for 6 confirmed Holocene eruptive periods.

1935 Dec - 1936 Oct Confirmed Eruption VEI: 1

Episode 1 | Eruption

NW flank

1935 Dec - 1936 Oct

Evidence from Observations: Reported

List of 3 Events for Episode 1 at NW flank

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Phreatic activity	moderate
- - - -	- - - -	Observation	Liquid sulfur
1935 Dec	- - - -	VEI (Explosivity Index)

1890 Jun 15 Confirmed Eruption VEI: 1

Episode 1 | Eruption

NW flank

1890 Jun 15 - Unknown

Evidence from Observations: Reported

List of 3 Events for Episode 1 at NW flank

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Phreatic activity	moderate
- - - -	- - - -	Fumarolic or Solfataric
1890 Jun 15	- - - -	VEI (Explosivity Index)

1889 Aug 9 - 1889 Oct 7 ± 7 days Confirmed Eruption VEI: 2 (?)

Episode 1 | Eruption

NW flank

1889 Aug 9 - 1889 Oct 7 ± 7 days

Evidence from Observations: Reported

List of 3 Events for Episode 1 at NW flank

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Phreatic activity	moderate
- - - -	- - - -	Observation	Liquid sulfur
1889 Aug 9	- - - -	VEI (Explosivity Index)

[ 1880 Nov 24 - 1880 Nov 26 ] Uncertain Eruption

Episode 1 | Eruption

1880 Nov 24 - 1880 Nov 26

Evidence from Unknown

List of 1 Events for Episode 1

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

1876 Sep 23 - 1876 Sep 26 Confirmed Eruption VEI: 2

Episode 1 | Eruption

NW flank

1876 Sep 23 - 1876 Sep 26

Evidence from Observations: Reported

List of 2 Events for Episode 1 at NW flank

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Phreatic activity	weak or small
	1876 Sep 23	- - - -	VEI (Explosivity Index)

1857 - 1858 Confirmed Eruption

Episode 1 | Eruption

1857 - 1858

Evidence from Observations: Reported

List of 3 Events for Episode 1

Start Date	End Date	Event Type	Event Remarks
- - - -	- - - -	Phreatic activity	Uncertain
- - - -	- - - -	Volcanic "smoke"
- - - -	- - - -	Observation	Liquid sulfur

0850 ± 500 years Confirmed Eruption

Episode 1 | Eruption

St-1 tephra

0850 ± 500 years - Unknown

Evidence from Correlation: Tephrochronology

List of 2 Events for Episode 1 at St-1 tephra

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

Deformation History

There is no Deformation History data available for Shiretoko-Iozan.

Emission History

There is no Emissions History data available for Shiretoko-Iozan.

Photo Gallery

Shiretoko-Iozan is seen here in late spring from the Shiretoko-Goko on the W side of the volcano. It is located at the NE tip of Hokkaido on the Shiretoko Peninsula and is noted for the extrusion of molten sulfur during eruptions in 1889 and 1936. Two large craters at the summit open to the NW.

Copyrighted photo by Yasuo Ikeda, 1994 (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/).

GVP Map Holdings

Maps are not currently available due to technical issues.

Smithsonian Sample Collections Database

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

External Sites

Copernicus Browser

The Copernicus Browser replaced the Sentinel Hub Playground browser in 2023, to provide access to Earth observation archives from the Copernicus Data Space Ecosystem, the main distribution platform for data from the EU Copernicus missions.

MIROVA

Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.

MODVOLC Thermal Alerts

Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.

WOVOdat
   Single Volcano View
   Temporal Evolution of Unrest
   Side by Side Volcanoes

WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.

GVMID Data on Volcano Monitoring Infrastructure The Global Volcano Monitoring Infrastructure Database GVMID, is aimed at documenting and improving capabilities of volcano monitoring from the ground and space. GVMID should provide a snapshot and baseline view of the techniques and instrumentation that are in place at various volcanoes, which can be use by volcano observatories as reference to setup new monitoring system or improving networks at a specific volcano. These data will allow identification of what monitoring gaps exist, which can be then targeted by remote sensing infrastructure and future instrument deployments.

Volcanic Hazard Maps

The IAVCEI Commission on Volcanic Hazards and Risk has a Volcanic Hazard Maps database designed to serve as a resource for hazard mappers (or other interested parties) to explore how common issues in hazard map development have been addressed at different volcanoes, in different countries, for different hazards, and for different intended audiences. In addition to the comprehensive, searchable Volcanic Hazard Maps Database, this website contains information about diversity of volcanic hazard maps, illustrated using examples from the database. This site is for educational purposes related to volcanic hazard maps. Hazard maps found on this website should not be used for emergency purposes. For the most recent, official hazard map for a particular volcano, please seek out the proper institutional authorities on the matter.

IRIS seismic stations/networks

Incorporated Research Institutions for Seismology (IRIS) Data Services map showing the location of seismic stations from all available networks (permanent or temporary) within a radius of 0.18° (about 20 km at mid-latitudes) from the given location of Shiretoko-Iozan. Users can customize a variety of filters and options in the left panel. Note that if there are no stations are known the map will default to show the entire world with a "No data matched request" error notice.

UNAVCO GPS/GNSS stations

Geodetic Data Services map from UNAVCO showing the location of GPS/GNSS stations from all available networks (permanent or temporary) within a radius of 20 km from the given location of Shiretoko-Iozan. Users can customize the data search based on station or network names, location, and time window. Requires Adobe Flash Player.

DECADE Data

The DECADE portal, still in the developmental stage, serves as an example of the proposed interoperability between The Smithsonian Institution's Global Volcanism Program, the Mapping Gas Emissions (MaGa) Database, and the EarthChem Geochemical Portal. The Deep Earth Carbon Degassing (DECADE) initiative seeks to use new and established technologies to determine accurate global fluxes of volcanic CO₂ to the atmosphere, but installing CO₂ monitoring networks on 20 of the world's 150 most actively degassing volcanoes. The group uses related laboratory-based studies (direct gas sampling and analysis, melt inclusions) to provide new data for direct degassing of deep earth carbon to the atmosphere.

Large Eruptions of Shiretoko-Iozan

Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

EarthChem

EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).