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Local Earthquake Tomography for Imaging Mining-Induced Changes Within the Overburden Above a Longwall Mine

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File Language:
English


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  • Personal Author:
  • Corporate Authors:
    National Institute for Occupational Safety and Health. Spokane Research Laboratory
  • Description:
    Three-dimensional velocity tomograms were generated on a daily basis to image mining-induced changes to the overburden above a longwall mine. The hypothesis was that a coherent redistribution of seismic velocity, due to the development of high-stress zones, could be imaged at the mine scale. Seam depth was 360 m and source location depth varied from 100 to 1000 m. Sixteen geophones were distributed over a 600 by 600 m square area on the surface above the mine. More than 12,500 events were recorded over an 18 day period. The recorded seismicity provided input for the local-earthquake tomography code, SIMULPS. Eighteen tomograms were generated and high-velocity regions correlated well with high abutment stresses. Additionally, the high-velocity regions were observed to redistribute as the longwall face retreated. These results indicate that velocity tomography can be used to provide a better understanding of temporal changes within a rock mass, and can potentially be used to produce a better understanding of the mechanisms that lead to unanticipated ground failures.
  • Subjects:
  • Source:
    42nd U.S. Rock Mechanics Symposium/2nd U.S.-Canada Rock Mechanics Symposium, June 29 - July 2, 2008, San Francisco, California Alexandria, VA: American Rock Mechanics Association, Paper No. 08-299, 2008 Jun; :1-7
  • Document Type:
    Text
  • Genre:
    Conference Publications
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • NIOSHTIC Number:
    nn:20034343
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:dce1fa4987a797cbe710d6c1584716b038329099e4a88e7b592ca3bf9770ccd470a7be20b0d2e70c663696618a92a44127ad0b95373ea526c51d3086833aa4c8
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  • File Type:
    Filetype[PDF - 278.12 KB ]
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