Depth variation in shear wave anisotropy at the Lehman discontinuity refers to the differences in how shear waves propagate through the Earth's layers, influenced by the material's properties at various depths. Anisotropy indicates that shear waves travel at different speeds depending on the direction of propagation, with shear waves (s-waves) being slower than primary waves (p-waves). The discussion highlights that under continents, there is observable shear wave anisotropy, attributed to geological structures and material composition, while under oceans, such anisotropy is absent, likely due to the uniformity of oceanic crust and differing geological processes. Understanding these variations is crucial for geophysical studies and seismic interpretation.
