|Region:||Africa and Red Sea|
|Duration of observation:||1997-2000, 2003-2010|
|Inferred cause of deformation:|
|Characteristics of deformation:|
O’a Caldera is covered by the tracks of InSAR data processed by Biggs et al. (2011), however it is also completely submerged under Lake Shalla. As a result of this, no direct InSAR observations have been made of the caldera. The closest coherent regions to the lake, however, show no deformation.
Fumerolic activity is observed all around the lake.
|Reference:||Biggs, J., I. D. Bastow, D. Keir, and E. Lewi (2011), Pulses of deformation reveal frequently recurring shallow magmatic activity beneath the Main Ethiopian Rift, Geochem. Geophys. Geosyst., 12, Q0AB10, doi:10.1029/2011GC003662.|
|Reference:||NASA Space Shuttle image ISS001-363-7, 2001 (http://eol.jsc.nasa.gov/).|
The 17 km wide eastern half of the southernmost lake (Lake Shalla) in this image is the O’a Caldera (Nasa. 2001).