Global Volcanism Program

The Global Volcanism Program has no activity reports available for Yoteizan.

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

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

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

Yotei

Cones

Feature Name

Feature Type

Elevation

Latitude

Longitude

Hangetsu-ko

Tuff cone

271 m

42° 50' 57" N

140° 45' 20" E

Basic Data

Volcano Number

Last Known Eruption

Elevation

Latitude
Longitude

285032

1050 BCE

1,888 m / 6,194 ft

42.827°N
140.812°E

Morphology

Volcano Landform
Composite

Volcano Types
Stratovolcano
Pyroclastic cone(s)
Lava dome(s)
Tuff cone

Rock Types

Major
Andesite / Basaltic Andesite
Dacite

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Population

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

205
19,419
80,006
2,988,960

Geological Summary

Yoteizan is a symmetrical andesitic-to-dacitic stratovolcano with a Fuji-like profile the forms a prominent landmark NW of Toya caldera. Its summit is truncated by a 700-m-wide crater that is cut on its NW rim by overlapping smaller craters. Deep radial gullies cut the flanks. The latest eruption from the main edifice took place about 5000-6000 years ago. Hangetsu-ko (Half Moon Lake), a tuff cone on the lower NW flank, was estimated from stratigraphic evidence to have erupted about 3000 years ago.

References

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

Hayakawa Y, 2009. (pers. comm.).

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

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/.

Ono K, Soya T, Mimura K, 1981. Volcanoes of Japan. Geol Surv Japan Map Ser, no 11, 2nd edition, 1:2,000,000.

Eruptive History

There is data available for 2 confirmed Holocene eruptive periods.

1050 BCE (?) Confirmed Eruption

Episode 1 | Eruption

NW flank (Hangetsu-ko)

1050 BCE (?) - Unknown

Evidence from Correlation: Tephrochronology

List of 2 Events for Episode 1 at NW flank (Hangetsu-ko)

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Explosion
	- - - -	- - - -	Ash

3550 BCE (?) Confirmed Eruption

Episode 1 | Eruption

3550 BCE (?) - Unknown

Evidence from Correlation: Tephrochronology

List of 1 Events for Episode 1

	Start Date	End Date	Event Type	Event Remarks
	- - - -	- - - -	Explosion	Uncertain

Deformation History

There is no Deformation History data available for Yoteizan.

Emission History

There is no Emissions History data available for Yoteizan.

Photo Gallery

Several generations of craters can be seen at the summit of Yotei volcano in SW Hokkaido, Japan. The principal crater of the symmetrical Yotei stratovolcano, seen here from the south, is 700 m wide. The NW rim of the crater was later modified by eruptions that produced the two overlapping smaller craters at the upper left. No historical eruptions are known from Yotei volcano.

Copyrighted photo by Katia and Maurice Krafft, 1981.

Yoteizan volcano, seen here from the NW, has deep radial valleys and a large crater at the summit with several smaller craters along the NW rim.

Photo by Ichiyo Moriya (Kanazawa University).

Yotei volcano is seen here to the NW above Lake Toya, which fills the 10-km-wide Toya caldera. The caldera formed during a major eruption about 110,000 years ago. A series of lava domes in the center of the lake form Nakanojima island, whose flank is in the right foreground. The photo was taken from the lower flank of Usu volcano, which formed on the southern rim of Toya caldera.

Photo by Norm Banks, 1981 (U.S. Geological Survey).

Shikotsu caldera, seen from the SE with Yoteizan volcano on the horizon, is a 13 x 15 km caldera filled by Lake Shikotsu. Following formation of the caldera more than 30,000 years ago, three small cones were constructed along a NW-trend across the caldera. Snow-capped Tarumai (left center) formed near the SE rim of the caldera, along with Fuppushi to its right. A third volcano, Eniwa, was constructed on the NW caldera rim at the far side of the lake.

Photo by Ichio Moriya (Kanazawa University).

Yoteizan volcano is seen here from the W. The deep radial gullies on the flanks are less pronounced on this side.

Photo by Shin'ichiro Gomi, 1997 (Hokkaido University).

The Fukidashi lava flow from Yoteizan in SW Hokkaido descended to the NE foot of the volcano. Vertical cooling joints can be seen to the left in this view near the terminus of the flow. Note the person behind the tree at the lower-center for scale.

Photo by Shin'ichiro Gomi, 1997 (Hokkaido University).

Yoteizan has a 700-800 m wide summit crater and smaller adjoining craters along its NW rim, shown in the center of this September 2019 Planet Labs satellite image monthly mosaic (N is at the top). Erosion has formed radial gullies down the flanks and the roughly 500-m-wide Hangetsu-ko crater is on the NW flank.

Satellite image courtesy of Planet Labs Inc., 2019 (https://www.planet.com/).

GVP Map Holdings

Maps are not currently available due to technical issues.

Smithsonian Sample Collections Database

There are no samples for Yoteizan 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 Yoteizan. 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 Yoteizan. 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 Yoteizan

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).