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To date, 3D time-lapse seismic monitoring at the Ketzin CO₂ storage pilot site comprised a baseline survey conducted in 2005 and two repeat surveys conducted in 2009 and 2012. At the time of the first repeat survey (22–25 kt of CO₂), the CO₂ plume was found to be concentrated around the injection well with a maximum lateral extent of approximately 300–400 m and a thickness of 5–20 m. Data from the 2012 survey (61 kt of CO₂), show further growth and migration of the amplitude anomaly interpreted to be induced by the CO₂ injection. The anomaly is similar in shape to that obtained from the 2009 survey, but significantly stronger and larger by ∼150 m in the N–S direction and by ∼200 m in the E–W direction. In agreement with the 2009 survey, the new data show a westward propagation of the plume, a trend governed by the complex structure of the reservoir. No evidence of systematic changes in the seismic …