Translations:Velocity analysis - book/1/en

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The wave equation governs seismic wave propagation. Because of the mathematical difficulties inherent in the exact wave equation, simpler concepts often are used instead. One is Fermat’s principle, which lets wave propagation be reduced to the study of raypaths that have minimal traveltimes. As a consequence of Fermat’s principle, at an interface between two media, the raypath is bent in accordance with Snell’s law.