In this study, we use P wave receiver functions from teleseismic events recorded at 24 permanent stations in the Corinth Rift and the surrounding regions to determine the crustal structures (thickness and Vp/Vs ratio) and the African slab geometry. Stations are operated by the National Network of Greece and are equipped with broadband seismometers. We selected events recorded between 2011 and 2021 with magnitude > 6.0 and epicentral distances between 30 and 95 degrees. We computed the receiver functions for each station using iterative time deconvolution and used Zhu and Kanamori's stacking method (2000) to estimate crustal thickness and Vp/Vs ratio. The results show that Moho depth varies from 28 km (Eastern Corinth rift) to 45 km in the western studied area. The deeper Moho values are correlated with the Hellenides mountain range (western part) and an isostatic behaviour. Some stations at the eastern Corinth rift (LOUT, LTK, PROD, KLV, GUR, VILL) display a clear signature from the subducting African crust, allowing for a better estimate of its thickness variation and lateral geometry changes.Arrival times and polarities of P to S converted waves at dipping structures are sensitive to the incident angle of the teleseismic P wave.For stations having good azimuthal coverage, the geometry (dip direction and dip value) of the slab crust and/or of the Aegean Moho beneath the stations will thus be inferred by inversion of the data through a grid search.
The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)