(Shalla, O'a Caldera)
Ethiopia
7.47 N, 38.55 E
summit elevation 2075 m
Stratovolcano
Lake Shala (Shalla) is located 168 km south of Addis Ababa. It is in Abijatta-Shalla National Park. The volcanic area is noted for sulphur springs and great white pelicans.
Lake Shalla is a very large caldera which probably represents the most important volcano-tectonic sinking of the whole Ethiopian Rift Valley. Lake Shalla is an elliptical basin with axes of 25 and 15 km. The lake is 250 m deep and its surface
is at 1500 m altitude.
Shalla caldera has vertical walls up to 200 m high. The caldera cuts mostly ignimbrites, pumice deposits and rhyolitic lava.
Further reading
Le Turdu, Caroline, et al. "The Ziway–Shala lake basin system, Main Ethiopian Rift: influence of volcanism, tectonics, and climatic forcing on basin formation and sedimentation." Palaeogeography, Palaeoclimatology, Palaeoecology 150.3-4 (1999): 135-177.
No recent eruptions.