Hertali

Volcano number:221171
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:Uncertain
Characteristics of deformation:

Between June and December 2007 3-5 cm of uplift was observed at Halebeti, a volcanic edifice names in Biggs et al. (2011), located ~10 km south of Hertali.
The deformation pattern is sharply cut off on the western side. Biggs et al. (2011) suggests that this indicates fault-controlled deformation, or an intrusion associated with dipping structure. The deformation pattern has been fit by a sill 5.8 x 8 km, at a depth of 2.7-8.8 km.
Following December 2007 5.4 cm of subsidence occurred over >1000 days, after which there is no data.

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:40.33, 9.78

Time series of deformation at Hertali (Haledebi) 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).