Shear wave splitting in the Alpine region

SUMMARY To constrain seismic anisotropy under and around the Alps in Europe, we study SKS shear wave splitting from region densely covered by AlpArray network. We apply a technique based on measuring intensity, constraining well both fast orientation delay. Four years of teleseismic earthquake data were processed, 723 temporary permanent broad-band stations deployment including ocean-bottom seismometers, providing spatial coverage that is unprecedented. The applied automatically (without human intervention), it thus provides reproducible image anisotropic structure Alpine region. As earlier studies, observe coherent rotation axes western part chain, homogeneous Central Alps. variation delay times particularly interesting though. On one hand, there clear positive correlation with topography, suggesting (deformation) caused orogeny. other strength mountain chain shows distinct contrast between Western Eastern This difference best explained more active mantle flow new observational constraints, especially delay, provide information geodynamics.