GEOSPECTRUM S.C.

Comparison of profiling results of attenuation and velocity of refracted P-wave in coal-seam

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In the paper the problem of effectiveness of seismic profiling of attenuation and velocity of refracted Pwave
in coal-seam along mining excavation in conditions of coal-seam edge impact has been presented.
For practical use of seismic attenuation profiling, special measurement and interpretation methodology has
been prepared. The measure of calculated attenuation is the value of attenuation coefficient based on
determination of amplitude of refracted P-wave. In the paper examples of attenuation coefficient and
velocity of refracted wave changes in the zones of exploitation seam edge in one of the Polish coal mines
have been described. The usefulness of attenuation coefficient for such analysis has been underlined due to
its greater sensitivity for changes of the state of stress and deformation in coal-seam comparing to changes
of refracted P-wave velocity. It is shown that attenuation can be an interesting parameter complementary
to refracted wave velocity in coal-seam, especially in high stress conditions.

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