The seismic velocity structure of the Larderello Geothermal Field of central Italy is investigated by inversion of seismic travel travel-time and waveform observations made on the 26-station seismic monitoring network operating in that area. We have divided the program of imaging the velocity structure of the Larderello area into two separate stages. The first stage utilizes abundant low frequency (0.5 to 3.0 Hz) teleseismic P-waveform data. Both teleseismic travel-time residual and waveform analysis techniques are used to produce a broad picture of the crust to depths of about 40 km. The second stage utilizes higher frequency (4.0 to 12 Hz) P and S wave travel-time observations from local earthquakes, and images the shallow and mid-crust to depths of about 15 km with higher resolution. The results of the first stage techniques are presented in this paper and the results of the second stage inversion in the following report (Block et al.).


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