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.
Synonyms |
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| Tugaru-Huzi | Tsugaru-Fuji | Okuno-Fuji | Asobenomori | ||||
Craters |
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| Feature Name | Feature Type | Elevation | Latitude | Longitude |
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Tanemakishiro
Tanemakisiro |
Crater | |||
| Torinoumi | Crater | |||
Domes |
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| Feature Name | Feature Type | Elevation | Latitude | Longitude |
| Iwaki-san | Dome | |||
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There is data available for 13 confirmed Holocene eruptive periods.
1863 Mar 23 Confirmed Eruption Max VEI: 1
| Episode 1 | Eruption Episode | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1863 Mar 23 - Unknown | Evidence from Observations: Reported | ||||||||||||||||||||||||
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List of 3 Events for Episode 1
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[ 1856 May 20 ] Uncertain Eruption
[ 1848 Jan 18 ] Uncertain Eruption
1845 Apr 4 Confirmed Eruption Max VEI: 2
| Episode 1 | Eruption Episode | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1845 Apr 4 - Unknown | Evidence from Observations: Reported | |||||||||||||||||||
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List of 2 Events for Episode 1
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1844 Apr 7 Confirmed Eruption Max VEI: 2
| Episode 1 | Eruption Episode | Summit and south flank? | |||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1844 Apr 7 - Unknown | Evidence from Observations: Reported | |||||||||||||||||||||||||||||
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List of 4 Events for Episode 1 at Summit and south flank?
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[ 1833 Apr 11 ] Uncertain Eruption
[ 1807 Mar 31 ] Uncertain Eruption
[ 1800 May 11 ] Uncertain Eruption
[ 1794 Apr 3 ] Uncertain Eruption
[ 1793 Apr 2 ] Uncertain Eruption
1790 Oct 9 Confirmed Eruption Max VEI: 2
| Episode 1 | Eruption Episode | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1790 Oct 9 - Unknown | Evidence from Observations: Reported | ||||||||||||||||||||||||
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List of 3 Events for Episode 1
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[ 1783 Dec 3 ] Uncertain Eruption
1782 Dec 1 ± 30 days - 1783 Mar 12 Confirmed Eruption Max VEI: 2
| Episode 1 | Eruption Episode | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1782 Dec 1 ± 30 days - 1783 Mar 12 | Evidence from Observations: Reported | ||||||||||||||||||||||||
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List of 3 Events for Episode 1
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[ 1782 Apr 12 ] Uncertain Eruption
[ 1769 ] Uncertain Eruption
[ 1709 Apr 23 ] Uncertain Eruption
[ 1694 Jun 19 ] Uncertain Eruption
[ 1672 Jul 12 - 1672 Jul 28 ] Uncertain Eruption
1618 Jan 31 Confirmed Eruption Max VEI: 2
| Episode 1 | Eruption Episode | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1618 Jan 31 - Unknown | Evidence from Observations: Reported | ||||||||||||||||||||||||
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List of 3 Events for Episode 1
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[ 1605 Apr 10 ] Uncertain Eruption
1604 Feb 7 Confirmed Eruption Max VEI: 3
| Episode 1 | Eruption Episode | Torinoumi | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1604 Feb 7 - Unknown | Evidence from Observations: Reported | ||||||||||||||||||||||||
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List of 3 Events for Episode 1 at Torinoumi
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1600 Jul 23 - 1600 Jul 25 Confirmed Eruption Max VEI: 2
| Episode 1 | Eruption Episode | Torinoumi | ||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1600 Jul 23 - 1600 Jul 25 | Evidence from Observations: Reported | ||||||||||||||||||||||||||||||||||
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List of 5 Events for Episode 1 at Torinoumi
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1600 Feb 22 Confirmed Eruption Max VEI: 2
| Episode 1 | Eruption Episode | Torinoumi | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1600 Feb 22 - Unknown | Evidence from Observations: Reported | ||||||||||||||||||||||||
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List of 3 Events for Episode 1 at Torinoumi
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[ 1597 Jun 13 ] Uncertain Eruption
[ 1597 Jan ] Uncertain Eruption
0550 BCE ± 500 years Confirmed Eruption
| Episode 1 | Eruption Episode | Torinoumi lava dome | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0550 BCE ± 500 years - Unknown | Evidence from Correlation: Tephrochronology | ||||||||||||||
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List of 1 Events for Episode 1 at Torinoumi lava dome
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1050 BCE (?) Confirmed Eruption
| Episode 1 | Eruption Episode | Summit and central lava dome | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1050 BCE (?) - Unknown | Evidence from Correlation: Tephrochronology | ||||||||||||||||||||||||
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List of 3 Events for Episode 1 at Summit and central lava dome
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4050 BCE (?) Confirmed Eruption
| Episode 1 | Eruption Episode | West summit lava dome | |||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4050 BCE (?) - Unknown | Evidence from Correlation: Tephrochronology | |||||||||||||||||||||||||||||
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List of 4 Events for Episode 1 at West summit lava dome
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8050 BCE (?) Confirmed Eruption
| Episode 1 | Eruption Episode | Torinoumi lava dome | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 8050 BCE (?) - Unknown | Evidence from Isotopic: K/Ar | ||||||||||||||
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List of 1 Events for Episode 1 at Torinoumi lava dome
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There is no Deformation History data available for Iwakisan.
There is no Emissions History data available for Iwakisan.
The irregular summit lava dome in the Iwakisan central crater forms the high point in this view from the SE, and has six craters on the flanks. Chokaisan is the rounded peak to the left. Debris avalanche deposits from repeated summit and flank collapse surround the volcano on all sides. Eruptions have been recorded since 1597 CE and have primarily been small-to-moderate phreatic explosions.
Iwakisan rises above farmlands below its SE flank. The peak to the left is Chokaisan and the 2-km-wide summit crater is filled by a lava dome that forms the summit. Eruptions have occurred since 1597 CE and have consisted primarily of small-to-moderate phreatic explosions.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.
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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 |
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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 |
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Title: Japan, South Korea Publisher: DMA Aerospace Center Country: Japan, S Korea Year: 1988 Series: ONC Map Type: Topographic Scale: 1:1,000,000 |
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Title: Japan, Soviet Union Publisher: DMA Aerospace Center Country: Japan, USSR Year: 1987 Series: TPC Map Type: Topographic Scale: 1:500,000 |
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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 |
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Title: Japan Publisher: DMA Aerospace Center Country: Japan Year: 1985 Series: TPC Map Type: Topographic Scale: 1:500,000 |
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Title: Historical Japan Publisher: National Geographic Society Country: Japan Year: 1984 Series: National Geographic Map Type: Geographic Scale: 1:2,982,000 |
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Title: Funakawa Publisher: Geographical Survey Institute of Japan Country: Japan Year: 1983 Map Type: Topographic Scale: 1:50,000 |
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Title: Geol Map of Japan/ Geol Atlas Publisher: Geol Survey of Japan Country: Japan Year: 1982 Map Type: Geology Scale: 1:1,000,000 |
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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 |
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Title: North Japan Publisher: Geographical Survey Institute of Japan Country: Japan Year: 1980 Map Type: Topographic Scale: 1:1,000,000 |
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Title: North Japan Publisher: Geographical Survey Institute of Japan Country: Japan Year: 1980 Map Type: Topographic Scale: 1:1,000,000 |
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Title: Geological Map of Japan Publisher: Geological Survey of Japan Country: Japan Year: 1978 Map Type: Geology Scale: 1:1,000,000 |
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Title: Geological Map of Japan Publisher: Geological Survey of Japan Country: Japan Year: 1978 Map Type: Geology Scale: 1:1,000,000 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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Title: North Japan Publisher: Geographical Survey Institute of Japan Country: Japan Year: 1966 Map Type: Topographic Scale: 1:1,000,000 |
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Title: Aomori Publisher: US Army Map Service Country: Japan Year: 1955 Series: AMS Map Type: Topographic Scale: 1:250,000 |
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Title: Akita Publisher: US Army Map Service Country: Japan Year: 1954 Series: AMS Map Type: Topographic Scale: 1:250,000 |
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Title: Sendai Publisher: US Army Map Service Country: Japan Year: 1943 Series: AMS Map Type: Topographic Scale: 1:1,000,000 |
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Title: Hakodate Publisher: US Army Map Service Country: Japan Year: 1943 Series: AMS Map Type: Topographic Scale: 1:1,000,000 |
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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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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. |
| 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. |
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Sentinel Hub Playground
Sentinel Hub EO Browser |
The Sentinel Hub Playground provides a quick look at any Sentinel-2 image in any combination of the bands and enhanced with image effects; Landsat 8, DEM and MODIS are also available. Sentinel Hub is an engine for processing of petabytes of satellite data. It is opening the doors for machine learning and helping hundreds of application developers worldwide. It makes Sentinel, Landsat, and other Earth observation imagery easily accessible for browsing, visualization and analysis. Sentinel Hub is operated by Sinergise |
| 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 Iwakisan. 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 Iwakisan. 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 Iwakisan | 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). |
