Seismic waveguide characteristics of an eastern Ohio coal seam
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Citation (Style = APA)
Wolfe, P. J. ; Holdeman, T. G. ; Richard, B. H. (1987). Seismic waveguide characteristics of an eastern Ohio coal seam.
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Wolfe, P. J. ; Holdeman, T. G. ; Richard, B. H. (1987). Seismic waveguide characteristics of an eastern Ohio coal seam.
Citation Downloads
Reference Manager (RIS)
SpreadSheed (CSV)
Organization: Society for Mining, Metallurgy & Exploration
Pages: 4
Publication Date:
Jan 1, 1987
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Abstract
Abstract
| Guided seismic wave propagation was studied in the Lower Freeport (6A) coal seam in the Oak Park No. 7 mine near Cadiz, OH. Three component geophones were implanted in the coal at distances ranging from 72 m to 183 m from the seismic source. Both Love- and Rayleigh-type modes were observed but the Love-type mode produced the best data. Detailed analysis was performed on the best Love data and a Dziewonski map of group velocity vs. frequency was constructed. This map was in excellent agreement with a theoretical dispersion curve calculated for a model of the coal seam. The Love wave group velocity was found to have a minimum value of 510 m/sec at 275 Hz. Only the fundamental mode contributed significantly to the observed signal and it was observed up to the maximum distance available. |
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