Teleseismic P waves at the AlpArray seismic network: wave fronts, absolute travel times and travel-time residuals

Abstract. We present an extensive dataset of highly accurate absolute travel times and travel-time residuals teleseismic P waves recorded by the AlpArray Seismic Network complementary field experiments in years from 2015 to 2019. The is intended serve as basis for tomography upper mantle below greater Alpine region. In addition, data may be used constraints full-waveform inversion recordings. comprises about 170 000 onsets derived records filtered upper-corner frequency 0.5 Hz 214 0.1 Hz. high accuracy residual was obtained applying a specially designed combination automatic picking, waveform cross-correlation beamforming. Taking individual events, we are able visualise detail wave fronts they propagate across AlpArray. Variations distances between isochrons indicate structural perturbations below. Travel-time events exhibit spatially coherent patterns that prove stable if similar epicentral distance azimuth considered. When all available stacked, conspicuous areas negative emerge lateral location subducting slabs beneath Apennines western, central eastern Alps. Stacking 90∘ wide azimuthal sectors results distributions positive generally consistent but differ due differing direction illumination structures incident waves. Uncertainties estimated peak width function its maximum value. median uncertainty 0.15 s at 0.18 Hz, which more than 10 lower typical up ±2 s. display regional dependence caused quality differences temporary permanent stations well site-specific noise conditions.