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We retrieve seismic velocity variations within the Earth's crust in the region of L'Aquila (central Italy) by analyzing cross‐correlations of more than two years of continuous seismic records. The studied period includes the April 6, 2009, M_w 6.1 L'Aquila earthquake. We observe a decrease of seismic velocities as a result of the earthquake's main shock. After performing the analysis in different frequency bands between 0.1 and 1 Hz, we conclude that the velocity variations are strongest at relatively high frequencies (0.5–1 Hz) suggesting that they are mostly related to the damage in the shallow soft layers resulting from the co‐seismic shaking.