Horizontal slices through the isotropic S velocity, |$v_{{S}}=\frac{1}{3}v_{{\small SV}}+\frac{2}{3}v_{{\small SH}}$|⁠, in model m₄₂. The black quadrilateral around Anatolia marks the volume to which regional shorter-period wave propagation is restricted. Closeups of the detailed structure within the quadrilateral are shown in Figs 12 and 13. Key to marked features: ACMS, Apennine–Calabrian–Maghrebides Slab; AM, Armorican Massif; APB, Alghero-Provençal Basin; AS, Alpine Slab; BM, Bohemian Massif; Ca, Caucasus; CSVF, Central Slovakian Volcanic Field; EEC, East European Craton; HCS, Hellenic–Cyprus Slab; Hi, Himalayas; HS, Hellenic Slab; IP, Iceland Plume; MC, Massif Central; PB, Pannonian Basin; RG, Rhine Graben; TIP, Turkish–Iranian Plateau; TP, Tibetan Plateau; TS, Tyrrhenian Sea; TTL, Tornquist–Teisseyre Line.