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

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

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

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
Urataman
Craters
Feature Name	Feature Type	Elevation	Latitude	Longitude
Brouton Caldera	Caldera	450 m

Basic Data Volcano Number Last Known Eruption Elevation Latitude Longitude 290191 Unknown - Evidence Credible 678 m / 2,224 ft 47.12°N 152.25°E Morphology Volcano Landform Composite Volcano Types Stratovolcano Pyroclastic cone(s) Lava dome Rock Types Major Andesite / Basaltic Andesite Tectonic Setting Subduction zone Oceanic crust (< 15 km) Population Within 5 km Within 10 km Within 30 km Within 100 km 3 9 20 33

Geological Summary The northernmost of volcanoes on Simushir Island, Uratman consists of an impressive 7.5-km-wide Pleistocene caldera that forms the NE tip of the island. Caldera walls rise 450 m above a 250-m-deep caldera bay. A narrow gap in the northern caldera rim provides sea-water access into the half-moon-shaped Brouton Bay, which fills the NW half of the caldera. A central somma cone, andesitic Uratman, has grown during the Holocene in the SE part of the caldera. Two cinder cones are located along the N flank of Uratman, and a lava dome was formed on its NW flank along Brouton Bay. No historical eruptions are known. References The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Gorshkov G S, 1970. Volcanism and the Upper Mantle; Investigations in the Kurile Island Arc. New York: Plenum Publishing Corp, 385 p.

Eruptive History

The Global Volcanism Program is not aware of any Holocene eruptions from Uratman. If this volcano has had large eruptions (VEI >= 4) prior to 12,000 years ago, information might be found on the Uratman page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

Deformation History

There is no Deformation History data available for Uratman.

Emission History

There is no Emissions History data available for Uratman.

Photo Gallery

A composite panorama from the NE rim of Brouton caldera on Uratman volcano shows Brouton Bay that fills the caldera floor due to a narrow gap in the NNE rim (right). A small settlement on the NE shore of the bay lies at the foot of the cone that was constructed in the SE part of the caldera. The 7.5-km-wide caldera formed during the Pleistocene.

Photo by Yoshihiro Ishizuka, 2000 (Hokkaido University). A large post-caldera cone (upper left) was constructed in the SE part of the Uratman caldera, the northernmost volcano on Simushir Island. The caldera is partially filled by Brouton Bay, shown here. Two cones and a lava dome are on the northern flank of the larger cone in this view from the NE caldera rim.

Photo by Yoshihiro Ishizuka, 2000 (Hokkaido University). A narrow gap in the NNE rim of the Pleistocene Brouton caldera resulted in the formation of Brouton Bay. The caldera floor lies 250 m beneath the ocean surface and the rim rises 450 m above it.

Photo by Yoshihiro Ishizuka, 2000 (Hokkaido University). A narrow gap in the NNE rim of 7.5-km-wide Pleistocene Brouton caldera on Uratman volcano in the Kuril Islands has led to the formation of the bay. The caldera floor lies 250 m beneath the ocean surface, and the rim rises 450 m above that. The central Uratman cone grew to a height of about 680 m during the Holocene.

NASA International Space Station image ISS005-E-6514, 2002 (http://eol.jsc.nasa.gov/). The 7.5-km-wide Pleistocene Uratman caldera containing Brouton Bay and the cone along the SE rim are shown in this October 2018 Planet Labs satellite image monthly mosaic (N is at the top). A lava dome is within the bay and the caldera walls reach up to 450 m in height. Two scoria cones are on the N flank and a lava dome formed on the NW flank.

Satellite image courtesy of Planet Labs Inc., 2018 (https://www.planet.com/).

GVP Map Holdings

Maps are not currently available due to technical issues.

Smithsonian Sample Collections Database

The following 1 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 116543-11	Dacite	--	--

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 Uratman. 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 Uratman. 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 Uratman	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).