Effect of mining subsidence on seismic velocity monitored by a repeated reflection profile
Journal Article
·
· Geophysical Prospecting
- Univ. of Durham (United Kingdom). Dept. of Geological Sciences
The authors have monitored changes in seismic velocity due to longwall coal-mining in the Selby coalfield, Yorkshire, England by ten repeated surveys of a surface seismic reflection profile. The direction of face advance in the Barnsley Seam, at 550 m depth, was parallel to the orientation of the profile. The traveltime of a strong reflection event from an anhydrite bed at 150 m depth was measured after processing the data with standard techniques. As the face advanced, the traveltime increased by about 4% overall. In detail, the progressive increase in traveltime correlated well with empirical calculations of differential subsidence between the surface and the anhydrite. However, the magnitude of the change must principally be accounted for by a decrease in seismic velocity, which they attribute to a reduction in the vertical effectiveness stress.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 37139
- Journal Information:
- Geophysical Prospecting, Journal Name: Geophysical Prospecting Journal Issue: 2 Vol. 43; ISSN GPPRAR; ISSN 0016-8025
- Country of Publication:
- United States
- Language:
- English
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