Impact of Mantle Velocity Uncertainty on Receiver‐Function Imaging of the Transition Zone

Abstract Seismological estimates of the 400‐km and 670‐km mantle discontinuities (d400 and d670) are crucial for understanding the thermochemical structure and dynamics of the mantle transition zone (MTZ). However, artifacts from using ray theory and uncertainties in mantle velocity structure can affect topographic mapping of these boundaries. The artifacts are expected but have not been thoroughly explored. We focus on the mantle beneath North America, computing common‐conversion‐point (CCP) im