Moho depths beneath the European Alps: a homogeneously processed map and receiver functions database

Abstract. Since the 1980s a number of active and passive seismic experiments have revealed significant information about the Earth’s crust in the broader European Alpine region. In this paper, we use seismic waveform data from the AlpArray Seismic Network and three other temporary seismic networks, to perform receiver function (RF) calculations and time−to−depth migration to update the knowledge of the Moho discontinuity beneath the broader European Alps. In particular, we set up a 5 homogeneous processing scheme to compute RFs using the time-domain iterative deconvolution method, and apply consistent quality control to yield 107,633 high-quality RFs. We then perform time−to−depth migration in a newly implemented 3D spherical coordinate system and using a European-scale reference P and S wave velocity model. This approach, together with the dense data coverage, provide us with a 3D migrated volume, from which we present migrated profiles that reflect the first-order crustal thickness structure. We create a detailed Moho map by manually picking the discontinuity in a set of orthogonal 10 profiles covering the entire area. We make the RF dataset, the software for the full processing workflow, as well as the Moho map, openly available; these open-access datasets and results will allow other researchers to build on the current study.