Mapping sedimentary basins and crust on/offshore western Greece by deep seismic soundings: The Corfu and Lefkas-Killini profiles

Seismic imaging of fluid-filled inherited structures of the Northern Thessaly (Greece) seismic gap

“…This feature possibly corresponds to a low-angle shear zone representing the basal detachment accommodating the overlying Pelagonian nappe, mainly consisting of metamorphic rocks, onto the recrystallized carbonate platform of the Gavrovo unit. The result is corroborated by lithological succession in regions close to our study area (Makris et al, 2001;Papoulia and Makris, 2010;Makris and Papoulia, 2018) and in region characterized by similar geodynamic context, where a similar succession has been inferred (Improta et al, 2000;Amoroso et al, 2014;Napolitano et al, 2021). Currently, the latter extensively outcrops in the Mount Olympus tectonic window about Horizontal slices for 0-10 km depths showing P-and S-wave velocity models (left and right panels, respectively).…”

Contrasting Styles of Salt‐Tectonic Processes in the Ionian Zone (Greece and Albania): Integrating Surface Geology, Subsurface Data, and Experimental Models

“…The seismic velocities of the Triassic evaporites that we have established range from 5.0 to 5.8 × 10 3 m s −1 (Table 1). These average velocities are higher than those of halite or rock salt (4.2–4.75 × 10 3 m s −1 ), and also turn out to be higher than those estimated for the Triassic evaporites by seismic tomography in the region of Greece (4.2–4.3 × 10 3 m s −1 ) or those deduced from boreholes in Albania (4.5–5.0 × 10 3 m s −1 ) (Makris & Papoulia, 2014, 2018, 2019; Velaj, 2002; Velaj et al., 1999). Our interpretation is that the estimated mean V p demonstrates that the evaporite succession has in addition to halite, other higher velocity lithologies such as dolomites, gypsum, and anhydrite (Jones & Davison, 2014).…”

“… i Seismic refraction studies in Greece suggest variable sonic velocities for the evaporites, ranging from 4,200 to 4,300 m s −1 (Makris & Papoulia, 2014, 2018, 2019) to 5,000–5,500 m s −1 (Kokinou et al., 2003), while in Albania average sonic velocities of 4,500–5,000 m s −1 are commonly used (Velaj, 2002; Velaj et al., 1999). …”

“…c In Albania, a progressive increase in the density of the "flysch" sequences from 2,470 km × m −3 at the surface and up to 2,650 kg × m −3 at 3 km depth has been measured in some wells (Veizaj & Polo, 1999). d The velocity of the carbonate sequence of the Ionian Zone, estimated by OBS experiments in offshore Greece, ranges between 4,200 and 5,700 (Barison et al, 2014) to 5,800-6,000 m s −1 (Makris & Papoulia, 2014). e The average density estimated with wells in Albania is quite uniform and does not show variations with depth.…”

“…h Lower and Upper Posidonia mudstones. i Seismic refraction studies in Greece suggest variable sonic velocities for the evaporites, ranging from 4,200 to 4,300 m s −1 (Makris & Papoulia, 2014, 2018 to 5,000-5,500 m s −1 (Kokinou et al, 2003), while in Albania average sonic velocities of 4,500-5,000 m s −1 are commonly used (Velaj, 2002;Velaj et al, 1999). j Densities are quite variable in the Triassic evaporites, ranging between 2,400 and 2,900-3,000 kg × m −3 in gypsum-or anhydrite-rich sequences, respectively.…”