Shear‐Wave Velocity Structure Beneath Northeast China From Joint Inversion of Receiver Functions and Rayleigh Wave Phase Velocities: Implications for Intraplate Volcanism

Abstract A high‐resolution 3D crustal and upper‐mantle shear‐wave velocity model of Northeast China is established by joint inversion receiver functions fundamental‐mode Rayleigh wave phase velocities. The teleseismic data used to calculate are collected from 107 CEA permanent sites 118 NECESSArray portable stations. dispersion measurements extracted an independent tomographic study. Our exhibits significant detail in S structure. Particularly, we observe a nearly constant 3.4–3.6 km/s shallow deep crystalline crust under the study area, which attribute high thermal gradient. Some modestly positive anomalies beneath Songliao basin interpreted as solidified late‐Mesozoic mafic intrusions. In upper mantle, confirm local presence low‐velocity zones below Changbai mountains Lesser Xing'an mountain range, consistent with asthenospheric mantle upwelling models. Furthermore, moderately low shear velocities imaged Halaha Abaga volcanoes indicate possible pathways magma ascent through lithospheric asthenosphere. At regional scale, average lithosphere‐asthenosphere boundary depth increases ∼70 km greater ∼100 basin, reaches ∼110–120 Greater range west. conjectured dense lid characterized fast velocities, may have prevented sublithospheric melts migrating surface.