High-Resolution Crustal S-wave Velocity Model and Moho Geometry Beneath the Southeastern Alps: New Insights From the SWATH-D Experiment

We compiled a dataset of continuous recordings from the temporary and permanent seismic networks to compute high-resolution 3D S-wave velocity model Southeastern Alps, western part external Dinarides, Friuli Venetian plains through ambient noise tomography. Part is recorded by SWATH-D network in Italy, Austria, Slovenia Croatia between October 2017 July 2018. computed 4050 vertical component cross-correlations obtain empirical Rayleigh wave Green’s functions. The complemented adopting 1804 high-quality correlograms other studies. fast-marching method for 2D surface tomography applied phase dispersion curves 2–30 s period band. resulting local are inverted 1D profiles using non-perturbational perturbational inversion methods. assembled into pseudo-3D down 60 km depth. A range iso-velocities, representing crystalline basement depth crustal thickness, determined. found average over 2.8–3.0 4.1–4.3 km/s iso-velocity ranges be reasonable representations Moho depths, respectively. map shows that shallower beneath Schio-Vicenza fault highlights boundary deeper east Po-plain west. estimated displays thickened crust along plain Dinarides. It also reveals N-S narrow corridor thinning junction Giudicarie Periadriatic lines, which was not reported imaging This located outcrop Permian magmatic rocks seems connected continuation magmatism deep-seated crust. compared shallow velocities hypocentral location earthquakes Southern foothills Alps. revealed seismicity mainly occurs ?3.1 ?3.6 km/s.