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Central Georgia is an area strongly affected by earthquake and landslidehazards. On 29 April 1991 a major earthquake (Mw  =  7.0) struck the Racharegion in Georgia, followed by aftershocks and significant afterslip. Thesame region was hit by another major event (Mw  =  6.0) on 7 September 2009.The aim of the study reported here was to utilize interferometric synthetic apertureradar (InSAR) data to improve knowledge about the spatial pattern of deformation dueto the 2009 earthquake. There were noactual earthquake observations by InSAR in Georgia. We considered all available SAR data images from different space agencies.However, due to the long wavelength and the frequent acquisitions, only themulti-temporal ALOS L-band SAR data allowed us to produce interferogramsspanning the 2009 earthquake. We detected a local uplift around 10 cm (alongthe line-of-sight propagation) in the interferogram near theearthquake's epicenter, whereas evidence of surface ruptures could not befound in the field along the active thrust fault. We simulated a deformationsignal which could be created by the 2009 Racha earthquake on the basis oflocal seismic records and by using an elastic dislocation model. We comparedour modeled fault surface of the September 2009 with the April 1991 Rachaearthquake fault surfaces and identify the same fault or a sub-parallel faultof the same system as the origin. The patch that was active in 2009 is justadjacent to the 1991 patch, indicating a possible mainly westward propagationdirection, with important implications for future earthquake hazards

InSAR observations of the 2009 Racha earthquake, Georgia