|Region:||Africa and Red Sea|
|Duration of observation:||April - August 2007|
|Inferred cause of deformation:||Magmatic, Faulting/tectonics|
|Characteristics of deformation:||
Ol Doinyo Lengai is the youngest of a series of Quaternary nepheline, phonolite and carbonatite volcanoes that lie on the eastern branch of the East African Rift, and is renowned as the only active carbonatite volcano on Earth. Even more noteable is that it\'s carbonatite products are alkali-rich natrocarbonite. Activity at Ol Doinyo Lengai is described as periodic: extended effusive eruptions of natrocarbonatite interspersed by explosive ash eruptions dominated by silica-undersaturated compositions. Most eruptions are small lava flows, pools and spatter cones (hornitos) confined to the summit crater, but five explosive eruptions have occurred in the last century, changing the volcano\'s morphology.
|References:||\'Biggs, J., Amelung, F., Gourmelen, N., Dixon, T. H., & Kim, S. W. (2009). InSAR observations of 2007 Tanzania rifting episode reveal mixed fault and dyke extension in an immature continental rift. Geophysical Journal International, 179(1), 549-558.\', \'Baer, G., Hamiel, Y., Shamir, G., & Nof, R. (2008). Evolution of a magma-driven earthquake swarm and triggering of the nearby Oldoinyo Lengai eruption, as resolved by InSAR, ground observations and elastic modeling, East African Rift, 2007. Earth and Planetary Science Letters, 272(1), 339-352.\', \'http://volcano.si.edu/volcano.cfm?vn=222120\'|