The Global Volcanism Program has no activity reports available for Itasy Volcanic Field.

The Global Volcanism Program has no Weekly Reports available for Itasy Volcanic Field.

The Global Volcanism Program has no Bulletin Reports available for Itasy Volcanic Field.

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.

Cones
Feature Name	Feature Type	Elevation	Latitude	Longitude
Ambohimalala	Cone
Ambohitritainerina	Cone
Ambohitrondry	Cone
Andranojavatra	Cone
Kassijie     Kassigie	Cone
Kitombold	Cone
Matiankanina	Cone
Tsifajavona	Cone
Craters
Feature Name	Feature Type	Elevation	Latitude	Longitude
Andranoratsy	Crater
Andranotoraha	Crater
Domes
Feature Name	Feature Type	Elevation	Latitude	Longitude
Ambohibe	Dome
Ampary	Dome
Angavo	Dome
Ingilofotsy	Dome
Kitia	Dome

Basic Data Volcano Number Last Known Eruption Elevation Latitude Longitude 233014 6050 BCE 1,800 m / 5,906 ft 19.033°S 46.7°E Morphology Volcano Landform Cluster Volcano Types Volcanic field Pyroclastic cone(s) Lava dome(s) Maar(s) Rock Types Major Trachyte / Trachydacite Trachybasalt / Tephrite Basanite Phonolite Tectonic Setting Intraplate Continental crust (> 25 km) Population Within 5 km Within 10 km Within 30 km Within 100 km 129,121 129,121 249,291 4,168,513

Geological Summary The Itasy volcanic field in central Madagascar contains a diverse assemblage of volcanic landforms, including scoria cones, lava domes, and maars. Activity began in the Pliocene and has continued into the Holocene. Early eruptions produced trachytic lava domes and basanitic lava flows. Later activity produced trachytic lava flows and Vulcanian eruptions. A trachytic maar was formed near Saovinandriana at the beginning of the Holocene, and several other crater lakes are present. Mild seismicity and thermal activity is present in the form of hot springs. References The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Battistini R, 1962. Le massif volcanique de l'Itasy (Madagascar). Annales Geog, 384: 167-178. Besairie H J, 1973. Precis de geologie Malgache. Annales Geol Madagascar, 36: 1-141. Camus G, 1993. (pers. comm.). Wood C A, 1980. (pers. comm.).

Eruptive History

There is data available for 2 confirmed Holocene eruptive periods.

Deformation History

There is no Deformation History data available for Itasy Volcanic Field.

Emission History

There is no Emissions History data available for Itasy Volcanic Field.

Photo Gallery

This vegetated lava dome is one of many at the Itasy volcanic field in central Madagascar. A steep-sided viscous lava flow descends to the left of the summit. Lateral levees at the margins of the flow form the distinct ridges at the lower left below a sharp bend in the lava flow.

Copyrighted photo by Katia and Maurice Krafft, 1973. The Itasy volcanic field in central Madagascar contains a diverse assemblage of volcanic landforms, including scoria cones, lava domes, and maars. Activity began in the Pliocene and has continued into the Holocene. A trachytic maar was formed near Saovinandriana at the beginning of the Hololcene, and several other crater lakes are present. Thermal activity in the form of hot springs, and mild seismicity continues at Itasy.

Copyrighted photo by Katia and Maurice Krafft, 1973. The Itasy volcanic field in central Madagascar contains numerous scoria cones, lava domes, and maar craters. The entire surface of this scoria cone, which has a shallow summit crater that is breached to the right, is mantled by geometric croplands of local farmers.

Copyrighted photo by Katia and Maurice Krafft, 1973. The Itasy volcanic field in central Madagascar lies W of Lake Itasy (lower center) and consists of a N-S-trending chain of scoria cones, lava domes, and maars. Several small dark-colored, lake-filled maars can be seen in the NASA Landsat image (N to the top), one of which lies just above the NW arm of Lake Itasy. Early eruptions producing trachytic lava domes and basanitic lava flows were followed by the effusion of trachytic lava flows and recent Vulcanian eruptions. Mild seismicity and hot spring activity continue at Itasy.

NASA Landsat 7 image (worldwind.arc.nasa.gov) The Itasy Volcanic Field is a monogenetic field in central Madagascar around Lake Itasy near the center of this September 2019 Planet Labs satellite image mosaic (N at the top). The field contains scoria cones, lava domes, lava flows, and maars across an area of 1,600 km². There have been 131 scoria cones identified throughout the field.

Satellite image courtesy of Planet Labs Inc., 2019 (https://www.planet.com/). The Itasy Volcanic Field in central Madagascar covers an area of around 1,600 km², some of which is seen here beside Lake Itasy in this September 2019 Planet Labs satellite image mosaic (N at the top). Several of the 131 identified scoria cones are in this area, as well as some lake-filled maar craters.

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 Itasy Volcanic Field 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 Itasy Volcanic Field. 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 Itasy Volcanic Field. 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 Itasy Volcanic Field	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).