Abstract
Reciprocity is usually applied to concentrated point forces and point receivers. However, reciprocity has a much wider application potential; in many cases, it is not used at its full potential because either a variety of source and receiver types are not considered, or their implementation is not well understood. In this chapter, the reciprocity relations for inhomogeneous, anisotropic, viscoelastic solids, and distributed sources and receivers are obtained. In addition to the usual relations involving directional forces, it is shown that reciprocity can also be applied to a variety of source-receiver configurations used in earthquake seismology and seismic reflection and refraction methods. Moreover, reciprocity applied to flexural waves illustrates another applicability of the principle.
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