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Worldwide Database of Volcanic Ground Deformation


Volcano number: 221240
Region: Africa and Red Sea
Country: Ethiopia
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.

References: '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: 39.05, 8.221