Moho and uppermost mantle structure in the Alpine area from S-to-P converted waves

Abstract. In the frame of AlpArray project we analyse teleseismic data from permanent and temporary stations Alpine region to study seismic discontinuities down about 140 km depth. We average broadband S-waveform retrieve S-to-P converted signals below stations. order avoid processing artefacts, no deconvolution or filtering is applied, S arrival times are used as reference for stacking. show a number north–south east-west profiles through area. The Moho always seen very clearly, negative velocity gradients depth also visible in profiles. A depression along larger parts chain. It reaches its largest 60 beneath Tauern Window. However, ends abruptly near 13∘ E eastern This may represent crustal trench, where Eurasian lithosphere subducted Adriatic lithosphere. East an important along-strike change occurs; image changes completely. No deepening found this easterly region; instead bends up contact between European all way Pannonian Basin. An was detected upper mantle structure at 14∘ E. There, lateral disappearance zone gradient uppermost indicates that S-dipping slab laterally terminates east Window axial Alps. area known have been affected by severe late-stage modifications crust during Miocene when ALCAPA (Alpine, Carpathian, Pannonian) block subject E-directed extrusion.