Nonlinear wave propagation study

We have examined some of the methods available for use in the laboratory to measure the inelastic attenuation of seismic waves in rocks. We conclude that the forced swept resonance technique is best suited for measuring the Q of linear anelastic materials, and for defining the transition amplitude from linear anelastic behavior to nonlinear behavior. For evaluating losses in materials at high amplitudes, which exceed the elastic limit, the best technique requires simultaneous measurements of the time functions of stress and strain under conditions that simulate seismic loading as closely as possible.