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Authors: Zaccarelli, L.* 
Shapiro, N. M.* 
Faenza, L.* 
Soldati, G.* 
Michelini, A.* 
Title: Variations of crustal elastic properties during the 2009 L’Aquila earthquake inferred from cross correlations of ambient seismic noise
Issue Date: 2011
Series/Report no.: /38 (2011)
DOI: 10.1029/2011GL049750
Keywords: seismic noise
L'Aquila Earthquake
Subject Classification04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis 
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 seis- mic records. The studied period includes the April 6, 2009, Mw 6.1 L’Aquila earthquake. We observe a decrease of seis- mic 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 varia- tions 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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