Volcano number:221240
Region:Africa and Red Sea
Geodetic measurements?Yes
Deformation observation?Yes
Measurement method(s):InSAR
Duration of observation:1997-2000, 2004-2010
Inferred cause of deformation:Magmatic
Characteristics of deformation:

InSAR data between 1997-2000 and 2004-2010 shows two periods of uplift, separated by a period subsidence (Biggs et al., 2011). The first period of uplift was in 2004, where ~3 cm was observed over ~3 months. After these 3 months some subsidence occurred, but until 2008 an absence of data prevents an accurate description of the exact changes throughout that time. Between August 2008 and June 2010 (900 days) a circular pattern of 5.3 cm of uplift was observed between Bora Berrichio and Tulla Moje volcano. The best fitting source model for this deformation was found to be a penny shaped crack between 0.9-1.3 km deep and 4.7-8.1 km radius (Biggs et al., 2011).
The deflation and inflation at Bora is also more linear (>4 year decay constant) that the nearby volcanoes of Alutu and Haledebi.

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.
Location:39.03, 8.27

Time series of deformation at Bora volcano, as well as other nearby volcanoes, from Envisat interferograms between 2004 and 2010. Orange highlights show periods of uplift, green highlights subsidence (Biggs et al., 2011).