Numerical study of seismic scattering and waveguide excitation in faulted coal seams
Finite-difference P-SV simulations of seismic scattering characteristics of faulted coal-seam models have been undertaken for near-surface P- and S-wave sources in an attempt to understand the efficiency of body-wave to channel-wave mode conversion and how it depends on the elastic parameters of the structure. The synthetic seismograms clearly show the groups of channel waves generated at the fault: one by the downgoing P-wave and the other by the downgoing S-wave. These modes travel horizontally in the seam at velocities less than the S-wavespeed of the rock. A strong Airy phase is generated for the fundamental mode...
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