ABSTRACT
To explore the dynamic response characteristics of ground during strong-motion earthquakes is essential to study the seismic stability of structure systems. Because the ground can be assumed to be an elastic body when the strain developed within it is less than 10−5, many researchers treat ground vibrations as a problem of elastic wave propagation. Reflection and refraction of the elastic wave at the boundary of a medium is explained in Fig. IV.20. When an SH wave is incident (S wave containing only the horizontal displacement component), both the reflected wave and the refracted wave are SH waves. When an SV wave (the S wave containing vertical component) 203or P wave is incident, however, it generates a reflected SV wave, a reflected P wave, a refracted SV wave, and a refracted P wave.
