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Variations of crustal elastic properties during the 2009 L'Aquila earthquake inferred from cross‐correlations of ambient seismic noise
Author(s) -
Zaccarelli L.,
Shapiro N. M.,
Faenza L.,
Soldati G.,
Michelini A.
Publication year - 2011
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2011gl049750
Subject(s) - seismology , geology , seismic noise , seismic velocity , crust , seismic microzonation , foreshock , seismic wave , slow earthquake , ambient noise level , shock (circulatory) , environmental seismic intensity scale , seismic hazard , geophysics , aftershock , earthquake scenario , interplate earthquake , sound (geography) , geomorphology , medicine
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.