Abstract
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, Mw 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.
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