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Itasy Volcanic Field   »  Summary

Itasy Volcanic Field

Itasy Volcanic Field Photo

Country:Madagascar
Subregion Name:Madagascar
Volcano Number:0303-014
Volcano Type: Scoria cones
Volcano Status:Radiocarbon
Last Known Eruption: 6050 BC (in or before)
Summit Elevation: 1800 m 5,905 feet
Latitude: 19.00°S * 19°0'0"S
Longitude: 46.77°E 46°46'0"E

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.

Global Volcanism ProgramDepartment of Mineral SciencesNational Museum of Natural HistorySmithsonian Institution

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