Rayleigh channel waves for the in-seam seismic detection of discontinuities
Item
Title (Dublin Core)
en-US
Rayleigh channel waves for the in-seam seismic detection of discontinuities
Description (Dublin Core)
en-US
Two-dimensional seismic models are used to reproduce the geological sequence cheek-seam-cheek in deep coal mines. The known reflection method based on Rayleigh channel waves is investigated with respect to discontinuities being composed of a termination of the seam and a fractured zone outside the seam. By means of fractured zones having different reflection coefficients discontinuities are designed representing clay hogs or microtectonic faults. Results obtained by investigating amplitudes, frequencies and phase velocities show a strong increase of the rate of amplitude decay with decreasing phase velocity. Furthermore it is demonstrated that the part of the Rayleigh channel wave propagating outside the seam is responsible for the detectability of a discontinuity. Expressing the detectability numerically the ratio ER of the channel wave's energy inside the seam to its total energy has been used. The value 0.5 for ER is derived to be a standard value for distinguishing the phase velocity range for which reliable reflection surveys are possible (ER > 0.5) or not (ER < 0.5).
ARK: https://n2t.net/ark:/88439/y015755
Permalink: https://geophysicsjournal.com/article/107
ARK: https://n2t.net/ark:/88439/y015755
Permalink: https://geophysicsjournal.com/article/107
Creator (Dublin Core)
Dresen, L.
Freystatter, S.
Subject (Dublin Core)
en-US
Detection of discontinuities in deep coal mines
en-US
Rayleigh channel waves
en-US
Reflection method
en-US
Model seismic experiments
en-US
Seismology
Publisher (Dublin Core)
en-US
Journal of Geophysics
Date (Dublin Core)
1976-04-08
Type (Dublin Core)
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
en-US
Peer-reviewed Article
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/107
Source (Dublin Core)
en-US
Journal of Geophysics; Vol 42 No 1 (1976): Journal of Geophysics; 111-129
2643-2986
2643-9271
Language (Dublin Core)
eng
Relation (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/107/69