Seam Waves - Trapped waves inside coal beds / José Regueiro
When a shot is fired inside a coal seam, much of the seismic energy produced may be trapped inside the seam.
About This Publication
Elastic wave speeds in coal are often less than in the rocks which form the roof and floor of the coal seam. This low-speed core with high-speed walls might be expected to form a waveguide in which seismic energy, once trapped, could propagate parallel to the seam with relatively low attenuation (assuming an obstruction did not intervene).
The coal seam guide is quite similar to the surface waveguide or the SOFAR channel which so dominates long-range sound transmission in the oceans. In the coal seam, both Love and pseudo-Rayleigh waves are possible.
Seam Waves
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Elastic wave speeds in coal are often less than in the rocks which form the roof and floor of the coal seam. This low-speed core with high-speed walls might be expected to form a waveguide in which seismic energy, once trapped, could propagate parallel to the seam with relatively low attenuation.
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