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The Global Volcanism Program has no activity reports for Iwakisan.
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The Global Volcanism Program has no Bulletin Reports available for Iwakisan.
Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|1863 Mar 23||Unknown||Confirmed||1||Historical Observations|
|[ 1856 May 20 ]||[ Unknown ]||Uncertain||2|
|[ 1848 Jan 18 ]||[ Unknown ]||Uncertain||2|
|1845 Apr 4||Unknown||Confirmed||2||Historical Observations|
|1844 Apr 7||Unknown||Confirmed||2||Historical Observations||Summit and south flank?|
|[ 1833 Apr 11 ]||[ Unknown ]||Uncertain||2|
|[ 1807 Mar 31 ]||[ Unknown ]||Uncertain||2|
|[ 1800 May 11 ]||[ Unknown ]||Uncertain||2|
|[ 1794 Apr 3 ]||[ Unknown ]||Uncertain||2|
|[ 1793 Apr 2 ]||[ Unknown ]||Uncertain||2|
|1790 Oct 9||Unknown||Confirmed||2||Historical Observations|
|[ 1783 Dec 3 ]||[ Unknown ]||Uncertain||2|
|1782 Dec 1 ± 30 days||1783 Mar 12||Confirmed||2||Historical Observations|
|[ 1782 Apr 12 ]||[ Unknown ]||Uncertain||2||South flank|
|[ 1769 ]||[ Unknown ]||Uncertain||2|
|[ 1709 Apr 23 ]||[ Unknown ]||Uncertain||2|
|[ 1694 Jun 19 ]||[ Unknown ]||Uncertain||2|
|[ 1672 Jul 12 ]||[ 1672 Jul 28 ]||Uncertain||2|
|1618 Jan 31||Unknown||Confirmed||2||Historical Observations|
|[ 1605 Apr 10 ]||[ Unknown ]||Uncertain||2|
|1604 Feb 7||Unknown||Confirmed||3||Historical Observations||Torinoumi|
|1600 Jul 23||1600 Jul 25||Confirmed||2||Historical Observations||Torinoumi|
|1600 Feb 22||Unknown||Confirmed||2||Historical Observations||Torinoumi|
|[ 1597 Jun 13 ]||[ Unknown ]||Uncertain||2|
|[ 1597 Jan ]||[ Unknown ]||Uncertain||2|
|0550 BCE ± 500 years||Unknown||Confirmed||Tephrochronology||Torinoumi lava dome|
|1050 BCE (?)||Unknown||Confirmed||Tephrochronology||Summit and central lava dome|
|4050 BCE (?)||Unknown||Confirmed||Tephrochronology||West summit lava dome|
|8050 BCE (?)||Unknown||Confirmed||Potassium-Argon||Torinoumi lava dome|
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.
|Tugaru-Huzi | Tsugaru-Fuji | Okuno-Fuji | Asobenomori|
|Feature Name||Feature Type||Elevation||Latitude||Longitude|
|Feature Name||Feature Type||Elevation||Latitude||Longitude|
|The irregular summit lava dome filling the central crater of Iwaki volcano forms the high point in this view of the SE side of the volcano. Chokai-san is the rounded peak on the left. The summit lava dome is flanked by six explosion craters. Debris-avalanche deposits from repeated collapse of the summit and flanks surround the volcano on all sides. Historical eruptions have been reported since 1597 and have consisted primarily of small-to-moderate phreatic explosions.
Copyrighted photo by Shingo Takeuchi (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/).
|Snow-capped Iwaki stratovolcano rises above farmlands below its SE flank. The peak at the left side of the summit is Chokai-san. Iwaki volcano, symmetrical on all but its western flanks, has been called the Fuji-san of the Tsugaru district. The 2-km-wide summit crater is filled by a lava dome that forms the high point of the volcano. Historical eruptions have been reported since 1597 and have consisted primarily of small-to-moderate phreatic explosions.
Copyrighted photo by Yoshihiro Ishizuka (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/).
The following 2 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections. Catalog number links will open a window with more information.
|Catalog Number||Sample Description|
|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).|
|WOVOdat||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.|
|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).|
|MODVOLC - HIGP MODIS Thermal Alert System||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.|
|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.|