Abstract
The attenuation of P- and S-waves in Southeastern Sicily was estimated by applying two different methods in time and frequency domains. We analyzed waveforms from about 290 local events (0.6≤ M L≤4.6) recorded at a three-component digital network. By applying the pulse broadening method to the first P-wave pulse, we found an average Q p value of ca. 140. The application of the frequency decay method provided a Q p value of ca. 120, in the low-frequency band (3–9 Hz). Conversely, in the high frequency range (16–27 Hz) the average Q p is significantly larger (ca. 640). The frequency decay method was also applied to S-waves spectra. In the low frequency range (2–5 Hz) the estimated average Q s is ca. 190. As for Q p, also Q s, in the high frequency range (16–27 Hz), is larger (ca. 700). These results evidenced a frequency dependence of both the quality factors Q p and Q s, as commonly observed in tectonically active zones characterized by high degree of heterogeneity.
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