Transmission Characteristics of In-Seam Seismic Waves Through Dykes at German Creek Central Colliery, Queensland

R. D. Hewson; L. A. Drake

doi:10.1071/EG991179

ISSN: 0812-3985
E-ISSN: 1834-7533

Transmission Characteristics of In-Seam Seismic Waves Through Dykes at German Creek Central Colliery, Queensland
Authors R. D. Hewson^a and L. A. Drake^a
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^a Centre for Geophysical Exploration Research Macquarie University, NSW, 2109
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 22, Issue 1, Mar 1991, p. 179 - 184
DOI: https://doi.org/10.1071/EG991179
- Published online: 01 Mar 1991

Abstract

An in-seam seismic survey was conducted by the Australian Coal Industry Research Laboratories (ACIRL) at the German Creek Central Colliery, Queensland, to detect and delineate dykes obstructing mining operations within the coal seam. A transmission analysis of the Love and Rayleigh waves has been carried out to test for absorption of the seismic energy by the dykes and hence to determine the viability of identifying the dykes using this technique. The seismograms and amplitude spectra for these wave types indicated significant attenuation across the survey area which included the three dykes. Finite difference and finite element modelling of the dykes was used to predict the absorption properties of the dykes. A study of the transmission losses in both the field and model data revealed that in-seam seismic data required coherent signals at frequencies greater than 250 Hz for detecting dykes in a coal seam of 2.5 m thickness.

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References

Asten, M. W., Drake, L. A., and Edwards, S. A., (1984). 'In seam seismic Love wave scattering by the finite element method'. Geophys. Prosp., 32, 649-661.
Buchanan, D. J., Jackson, P. J., and Davis, R., (1983). 'Attenuation and anisotropy of channel waves in coal seams'. Geophysics, 48, 133-147.
Drake, L. A., (1988). 'Faults and absorption in coal seams'. Explor.Geophys. 19, 48-50.
Edwards, S. A., Asten, M. W., and Drake, L. A., (1985). 'P-SV wave scattering by coal seam inhomogeneities'. Geophysics, 50, 214-223.
Emmerich, H., and Korn, M., (1987). 'Incorporation of attenuation into time-domain computations of seismic wave fields'. Geophysics, 52, 1252-1264.
Greenhalgh, S. A., Burns, D., and Mason I., (1986). 'A cross-hole and face-to-borehole in-seam seismic experiment at Invincible Colliery, Australia'. Geophys. Prosp., 34, 30-55.
Hatherly, P. J., (1986). 'In-seam seimic survey – Central Colliery'. Australian Coal Industry Research Laboratories. Report 11/1012/1 (unpubl.).
Korn, M., and Stoeckl, H., (1982). 'Reflection and transmission of Love channel waves at coal seam discontinuities computed with a finite difference method'. J. Geophys., 50, 171-176.
Krey, T. C, (1963). 'Channel waves as a tool of applied geophysics in coal mining'. Geophysics, 28, 701-714.
Lysmer, J., and Drake, L. A., (1972). 'A finite element method for seismology'. In Bolt, B.A. (Ed.) 'Methods in Computational Physics 11', Academic Press, New York, 181-216.

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Article Type: Research Article

Keyword(s): Coal Seam; Finite Difference; Finite Element; Longwall

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Transmission Characteristics of In-Seam Seismic Waves Through Dykes at German Creek Central Colliery, Queensland

Abstract

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