The southern Aegean is characterized by an ongoing process of oceanic subduction. In this study, 1,718 intermediate depth (>35 km) events recorded in the southern Aegean are used to calculate the peak delay times (tp). The tp are measured as the time difference between S wave onset and the peak of the S wave envelope in 2-to 4-, 4- to 8-, 8- to 16-, and 16- to 32-Hz bands. The tp are also inverted to estimate the scattering parameters (κ and εparam) and power spectral density function (P (m)) at large wave numbers (m = 15 km−1 or ml) of the medium modeled as von Kármán type. κ controls frequency dependence of scattering while P (ml) represents the scattering strength in high frequencies for ɑml >> 1 (ɑ = correlation length of inhomogeneities). High P (ml) with low κ across Peloponnese in 0- to 20-km depth may result from intermixing of oceanic material with continental rocks at different levels with a possibility of fluid activity and salt diapirism in northwest Peloponnese. Moderate P (ml) in 0- to 60-km depth across Crete is likely due to a combination of factors including past megathrust earthquakes, sediment underplating, and flow of metamorphosed material in a subduction channel. Cyclades shows low κ in 0- to 40-km depth, indicative of inhomogeneities produced by metamorphic core complexes. Very low κ in 60- to 80-km depth is consistent with the location of mantle magma reservoir in the back-arc region. Our results suggest that a significant portion of total S wave attenuation (Qs −1) in eastern Cyclades for 20- to 80-km depth may be due to scattering losses.
|頁（從 - 到）||10393-10412|
|期刊||Journal of Geophysical Research: Solid Earth|
|出版狀態||已出版 - 1 10月 2019|