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Authors: Lucente, F. P.*
De Gori, P.*
Margheriti, L.*
Piccinini, D.*
Di Bona, M.*
Chiarabba, C.*
Piana Agostinetti, N.*
Title: Temporal variation of seismic velocity and anisotropy before the 2009 MW 6.3 L’Aquila earthquake, Italy
Title of journal: Geology
Series/Report no.: 11/38 (2010)
Publisher: Geological Society of America
Issue Date: 3-Nov-2010
DOI: 10.1130/G31463.1
Keywords: Seismic Velocity
Seismic Anisotropy
Abstract: We describe a set of seismological observations on the foreshock sequence preceding the April 6th 2009, Mw 6.3, L’Aquila earthquake. The dense configuration of the seismic network in the epicenter area and the occurrence of a long foreshock sequence provide the opportunity for a detailed reconstruction of the preparatory phase of the main shock. Approaching the earthquake, we observe clear variations of the seismic wave propagation properties. The elastic properties of rocks in the fault region undergo a sharp change about a week before the earthquake. From our observations we infer that a complex sequence of dilatancy-diffusion processes takes place and that fluids play a key role in the fault failure process.
Appears in Collections:04.06.01. Earthquake faults: properties and evolution
Papers Published / Papers in press

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