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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 65 (1981)

Issue: 5. (May)

First Page: 1013

Last Page: 1013

Title: Transmission Survey Using Seismic Guided Waves: Cadiz, Ohio: ABSTRACT

Author(s): Timothy G. Holdeman

Article Type: Meeting abstract


When seismic survey energy is initiated within a coal Previous HitseamNext Hit, internally reflected S and P waves constructively interfere to form a Previous HitseamNext Hit wave. The Previous HitseamNext Hit wave is a high-frequency, dispersive wave which may exhibit both Rayleigh-type and Love-type modes. Since the Previous HitseamNext Hit wave is confined to the coal Previous HitseamNext Hit, its frequency content and dispersion characteristics are a function of the elastic properties and thickness of the coal Previous HitseamNext Hit. Large variations in the elastic properties or thickness of the coal Previous HitseamNext Hit, such as faults, sand bodies and pinch-outs, will affect the frequency and dispersion of the Previous HitseamNext Hit wave.

Previous HitSeamNext Hit-wave studies applied to coals in the eastern United States are few. The paper gives an acount of a transmission survey shot across a block of coal in the Oak Park Mine located near Cadiz, Ohio. The coal Previous HitseamNext Hit, under investigation is the lower Freeport (6A) which is 54 in. (14 cm) thick at the Oak Park Mine. Conducting an underground seismic survey presents many difficulties including: (1) mine accessibility; (2) underground-safety regulations; (3) source and receiver coupling; and (4) maneuverability. Comparison of the observed dispersion and predicted dispersion of the Previous HitseamTop wave reveals its dominant mode and frequency content.

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