Theoretical and practical aspects of absorption in the application of in-seam seismic coal exploration
During the last two decades, the detection of coal seam discontinuities by seismic waves guided by the seam has become a special branch of exploration seismics in Europe. Waves consisting purely of SH motion (Love-type waves) are of special interest, and the rather high frequencies of the Airy phase, in thin seams, are most important because they present very high reflectivity at seam interruptions. Absorption increases with frequency in most layers, and therefore attenuates the high Airy-phase frequencies more severely than the earlier low-frequency part of the guided waves. In order to allow a better understanding of the influence of absorption on Love-type seam waves, several simplified computations were carried out for the fundamental mode of a seam typical for the north-west-German Ruhr area.
- OSTI ID:
- 6081680
- Journal Information:
- Geophysics; (United States), Journal Name: Geophysics; (United States) Vol. 47:12; ISSN GPYSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
011000* -- Coal
Lignite
& Peat-- Reserves
Geology
& Exploration
012000 -- Coal
Lignite
& Peat-- Mining
ABSORPTION
CALCULATION METHODS
COAL DEPOSITS
COAL SEAMS
DIMENSIONS
EXPLORATION
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
MAPPING
MINERAL RESOURCES
RESOURCES
SEISMIC S WAVES
SEISMIC SURVEYS
SEISMIC WAVES
SURVEYS
THICKNESS
WAVE PROPAGATION