Historical intermediate-depth earthquakes in the southern Aegean Sea Benioff zone: modeling their anomalous macroseismic patterns with stochastic ground-motion simulations

Semi-automated stochastic simultaneous simulation of macroseismic information and strong ground motion records for recent strong earthquakes of the Aegean area

“…b) The near-source crust's average shear wave velocity (β) was based on a near-source 1-D average calculated from the 3D model of Papazachos and Nolet [1997], while the density (ρ) was computed from appropriate Vs-ρ conversion relations [Boore, 2016]. The rupture propagation velocity, Vrup, was set to a typical value of 0.8β, and shear wave velocity (β) was set to 3.4 km/s [Benetatos and Kiratzi, 2006;Yolsal-Çevikbilen and Taymaz, 2012;Kkallas et al, 2018].…”

“…For the geometric attenuation the default geometric spreading was applied, which has been also shown to be appropriate for Greece [e.g. Roumelioti, 2004;Roumelioti et al, 2017;Kkallas et al, 2018;Giannaraki et al, 2019]. Moreover, the anelastic attenuation was constrained by a mean frequency-dependent quality factor, Q(f) = 100f 0.8 , proposed for the broader Aegean Sea by Hatzidimitriou (1993Hatzidimitriou ( , 1995.…”

“…pirical Vs 30 assessment from topographic slope data for the Europe and Greece [Lemoine et al, 2012;Stewart et al, 2014], and has been successfully applied for intermediate-depth events in Greece (Kkallas et al, 2018]. Using the determined Vs 30 value from the previous process, soil classes according to NEHRP (1994) have been assigned to each site for which simulations were performed (IDP site).…”

“…Starting for the pioneering works of Boore [1983] and Boore and Atkinson [1987] stochastic simulations have been used in several applications for strong ground motion studies. More specifically, the finite fault simulation approach was applied for historical earthquakes in Greece, for which only damage information (macroseismic intensities) was available [Papazachos et al, 2015;Kkallas et al, 2018]. Papazachos et al [2015] used stochastic simulation to model the spatial distribution of the strong ground motion for the large historical earthquakes of Sofades (1954, M7.0) and Velestino (1957, M6.8) (southern Thessaly basin, central Greece), using observed macroseismic intensities (I MM up to 9+).…”

“…Papazachos et al [2015] used stochastic simulation to model the spatial distribution of the strong ground motion for the large historical earthquakes of Sofades (1954, M7.0) and Velestino (1957, M6.8) (southern Thessaly basin, central Greece), using observed macroseismic intensities (I MM up to 9+). Kkallas et al [2018] modelled the macroseismic damage distribution of several intermediate-depth…”