Lecture 1: Physical Principles
The subject of seismic anisotropy has a long history, but only recently has it come to be seen as a central feature of geophysics, as applied to the exploration for hydrocarbons and to their exploitation. The reason for the long neglect of anisotropy is, of course, that isotropy is simpler. The equations are simpler, and the application of one's intuition is more direct. And, perhaps because of their simplicity, these basic, isotropic ideas have enabled the discovery most of the world's known hydrocarbons.