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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