The amplification effect of soil media due to SH wave

Abstract

The objective of this study is to investigate the amplification spectra of the single layered soil medium subjected to various SH sources from distinct locations. The source of model I is treated as a harmonic plane SH source, of which the generated wave propagates in one direction. To make the source approach the seismic mechanism, the harmonic line SH source is adopted as the one used by model II, by which the amplification spectra at distinct locations can be obtained. Frequently, the applied duration of the seismic source is limited, so the generalized ray theory is a powerful mathematic tool for dealing with the propagation problem of waves generated by a transient line SH source. This is the source of model III in this study. Then the obtained results show that the amplification effects decrease with an increasing damping factor, and the spectra vary with distinct sources, locations and even applied durations.

Key words:

• amplification spectra
• harmonic SH source
• transient SH source
• generalized ray theory
• soil medium