Résumé
The Gulf of Corinth is one of the fastest‐extending continental rifts in Europe, yet the link between present‐day strain, inherited crustal structure, and lithospheric dynamics remains debated. We investigate crustal thickness and Vp/Vs variations using receiver functions from 31 seismic stations. Robustness is ensured through H–k stacking combined with bootstrap resampling, over a wide range of crustal P‐wave velocities, and careful evaluation of alternative phase interpretations where slab‐related conversions interfere with Moho signals. Moho depths range from 25 to 42 km (average 31.9 ± 2.9 km). The thickest crust lies beneath the external Hellenides in the west, whereas the thinnest crust occurs along the northeastern rift margin within the internal Hellenides. Bootstrap uncertainties (typically 2–3 km) are smaller than the observed lateral variations, supporting the robustness of relative Moho gradients. Notably, maximum crustal thinning is offset by more than 50 km from the highest present‐day extension rates in the western Gulf and from the major active southern faults. Vp/Vs ratios (1.67–1.93) and intracrustal negative conversions reveal lateral heterogeneities and low‐velocity zones at depths of ∼14 and ∼20 km, interpreted as mechanically weak levels within the middle to lower crust. In the western forearc, strong conversions from the subducting African slab obscure the Aegean Moho and constrain the mantle wedge boundary. We propose that Corinth Rift evolution reflects interaction between inherited nappe‐scale crustal thickness variations and a weak lower crust enabling rheological decoupling, explaining the spatial offset between crustal thinning and present‐day strain localization.