Propagation of underground explosion waves in the nearly elastic range.

abstract The effect of small anelasticity on the propagation of spherically symmetric waves is examined with numerical calculations. The type of anelasticity used is static hysteresis with nominal Q value of 100. Linear theories do not apply in this case. Fourier components of different frequencies do not propagate independently, but energy is transferred to lower frequencies. The extent to which reduced displacement potential is not invariant with respect to radius is examined for explosions in granite, salt, and shale.