Itasy Volcanic Field

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 19°S
  • 46.77°E

  • 1800 m
    5904 ft

  • 233014
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports 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.

Basic Data

Volcano Number

Last Known Eruption



6050 BCE

1800 m / 5904 ft


Volcano Types

Pyroclastic cone(s)
Lava dome(s)

Rock Types

Trachyte / Trachyandesite
Trachybasalt / Tephrite Basanite

Tectonic Setting

Continental crust (> 25 km)


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

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 recent 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 in the form of hot springs continues at Itasy.


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.

Wood C A, 1980. (pers. comm.).

Eruptive History

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
6050 BCE (in or before) Unknown Confirmed   Radiocarbon (uncorrected)
7130 BCE ± 100 years Unknown Confirmed   Radiocarbon (uncorrected)

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.


Feature Name Feature Type Elevation Latitude Longitude
Ambohimalala Cone
Ambohitritainerina Cone
Ambohitrondry Cone
Andranojavatra Cone
Kitombold Cone
Matiankanina Cone
Tsifajavona Cone


Feature Name Feature Type Elevation Latitude Longitude
Andranoratsy Crater
Andranotoraha Crater


Feature Name Feature Type Elevation Latitude Longitude
Ambohibe Dome
Ampary Dome
Angavo Dome
Ingilofotsy Dome
Kitia Dome

Photo Gallery

The Itasy volcanic field in central Madagascar lies west 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 (with north 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 Landsat7 image (

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.

Affiliated Sites

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).
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.