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- W4242912463 abstract "Publisher SummaryThis chapter discusses the body waves and ray theory. P and S waves are known as body waves because they travel along paths throughout the continuum. The solutions for P and S waves give the locations of wavefronts, which are loci of points that undergo the same motion at a given instant in time. Rays are defined as the normals to the wavefront and thus point in the direction of propagation. In the case of a plane wave, the rays are a family of parallel straight lines; in the case of a spherical wave, the rays are spokes radiating out from the seismic source. Rays provide a convenient means of tracking an expanding wavefront. They also provide an intuitive framework for extending elastic-wave solutions from homogeneous to inhomogeneous materials. When a ray strikes a boundary marking a change in seismic velocity, the energy in the wave is partitioned between a reflected and a refracted ray. These two new, or derivative, rays have the same ray parameter as the incident ray. The angle (i or τ) that the reflected and refracted rays make with a vertical plane is governed by Snell's law. The variation of wave energy depends on velocity structure (d2T/dX2) and distance traveled (X). In general, the wave amplitude decays with distance; this is known as geometric spreading." @default.
- W4242912463 created "2022-05-12" @default.
- W4242912463 date "1995-01-01" @default.
- W4242912463 modified "2023-09-27" @default.
- W4242912463 title "Body Waves and Ray Theory" @default.
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- W4242912463 doi "https://doi.org/10.1016/s0074-6142(05)80004-x" @default.
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