Abstract : The work reported consists of three task areas: (a) development of constitutive models and computer methods for calculating stress wave effects in geologic media in the vicinity of a buried energy source, (b) verification of the computer models and their application to examine the sensitivity of ground motion predictions to the material parameters assumed in the constitutive models, and (c) development of methods for calculating the perturbation of residual tectonic stress-strain distributions induced by changing the pore water pressure.