Fig. 2: Receiver Function (RF) profile across the East Anatolian Plateau (EAP).
From: Crustal melting and continent uplift by mafic underplating at convergent boundaries
a Depth-migrated RF profile (red and blue colors represent increase and decrease of seismic impedance with depth, respectively). Black line atop RFs shows topography along the profile and its variation within a ± 40 km-wide corridor (grey shading). Color boxes at the top mark four tectonic units (BM – Bitlis Massif, NWIF – NW Iranian Fragment) separated by suture zones (BS – Bitlis Suture, MS – Muş Suture). Inverted triangles show the locations of seismic stations. Grey wiggly lines are the stacked RFs at each station migrated to depth. TL and M1 converters surround a ~ 10 km thick intra-crustal low-velocity zone, M1 is the previously interpreted RF Moho30,45, which we interpret as the top of a mafic layer above our interpreted Moho M2. b Crustal velocity models for two stations (red triangles in a) based on modelling with synthetic RFs (Supplementary Fig. 2). The ~10 km thick low-velocity intra-crustal zone (red color) has an electric resistivity of 1 Ωm35 and a density of 2.60 g/cm3; and the ~20 km thick lower crust has an electric resistivity of 10–30 Ωm35 and a density of 3.05 g/cm3. c Sketch of our interpretation. Numbers are density in g/cm3 constrained by gravity modeling (Supplementary Fig. 5b). Solid line M2 – the interpreted Moho, dashed line M1 – top of mafic underplate.
