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Authors: Monna, S.* 
Filippi, L.* 
Beranzoli, L.* 
Favali, P.* 
Title: Rock properties of the upper-crust in Central Apennines (Italy) derived from high-resolution 3-D tomography
Issue Date: 11-Apr-2003
Series/Report no.: VOL. 30, NO. 7
DOI: 10.1029/2002GL016780
Keywords: Physical properties of rocks
Seismicity and seismotectonics
Subject Classification04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy 
Abstract: High-resolution 3-D P and S-wave velocity models of a central sector of the Apennines (Central Italy) are computed by inverting first arrival times from an aftershock sequence (September–December, 1997) following the Mw 5.7 and Mw 6.0 Umbria-Marche earthquakes that occurred on September 26, 1997. The high quality of the data set, especially for the S-wave, allows us to compute 3-D variations in Vp, Vp/Vs and Vp · Vs. The anomalies can be interpreted as lateral changes in rock type and fracturing, which control fluid diffusion and variation in pore pressure. This is in agreement with a poro-elastic view that can be inferred from the spatio-temporal evolution of the seismic sequence.
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