Velocity Structure of the Earth’s Crust and Upper Mantle Beneath the Eastern Part of the Verkhoyansk Fold Belt Kharaulakh Segment from Receiver Functions and Surface Wave Data

By applying surface-wave tomography (SWT) and receiver function (RF) methods, new estimates of the VS velocity distribution in the Earth’s crust and upper mantle down to depths of approximately 300 km have been obtained beneath the eastern part of the Kharaulakh segment of the Verkhoyansk fold belt. In addition, the radial anisotropy parameters of the medium were evaluated. The RF and SWT methods were applied independently to enhance the reliability of the resulting estimates, yielding mutually consistent results. The analysis identified three crustal layers with a combined thickness of 30 km, which are underlain by a 30–35 km thick crust–mantle transition zone. In the upper mantle, a complex low-velocity zone was detected at depths of 90–180 km, which may feature a two-layer structure.