This paper presents a new shear velocity and attenuation model for the lower crust and litho-sphere of the Aegean region, obtained by inversion of broadband surface-wave phase veloci-ties and attenuation coefficients. We have two main motivations for conducting this study. First, knowledge of the regional structure of the Aegean lithosphere is fundamental for understanding the tectonic framework and mantle dynamics, posing constraints on possible models of deformation and evolution. Second, the exponential dependence of Q with temperature implies that attenuation tomography could explain better hot regions (high attenuation) than elastic tomography. Furthermore, elastic velocity is highly influenced by the constitution of the medium. In case of strong lateral Q variations, elastic parameters also vary. Hence, it is important to combine results of elastic and anelastic tomography. Apparently, the high rates of deformation in the Aegean constitute this region particularly interesting in this perspective.

This study presents results of ambient noise measurements carried out in 78locations in the town of Lefkada. The horizontal-to-vertical spectral ratios of ambient noise were used to approximate the fundamental resonance frequencies of the subsurface and their associated amplitudes. Summarizing the experiences of different authors with respect to ambient vibration processing, we selected transient free time windows for further analysis. Additionally, we calculated the site responses with respect to the reference site and compared the results with those obtained from the H/V technique. The fundamental frequency and the corresponding amplification factor were calculated for each site. Under the assumption that the H/V spectral ratios of ambient noise coincide with the amplification levels at the dominant frequency of the site response functions, the fundamental frequencies (f0) and amplification factors (A0) were compiled on ARC-INFO GIS software and corresponding maps were developed.