Dictionary:Earth model

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A numerical representation of some property (e.g., seismic velocity or density) as a function of location. Geophysical models of the whole Earth often assume that it consists of concentric, homogeneous, and isotropic layers within each of which the velocity varies smoothly. The deeper layering and variation of physical properties with depth is indicated in Figure E-1. Raypaths and wavefronts for direct P-waves are shown in Figure E-2.