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Mining Publication: Local Earthquake Tomography for Imaging Mining-Induced Changes Within the Overburden above a Longwall Mine
Keywords: Earthquakes Ground stability Longwall mining Seismic monitoring Seismometry
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: July 2008
Authors: EC Westman, KD Luxbacher, PL Swanson
Conference Paper - July 2008
Download PDF Document (0.26 MB)
NIOSHTIC2 Number: 20034343
42nd U.S. Rock Mechanics Symposium/2nd U.S.-Canada Rock Mechanics Symposium, June 29 - July 2, 2008, San Francisco, California, ARMA 08-299. The American Rock Mechanics Association, 2008; :1-7
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.
Image of publication Local Earthquake Tomography for Imaging Mining-Induced Changes Within the Overburden above a Longwall MineConference Paper - July 2008
Download PDF Document (0.26 MB)
NIOSHTIC2 Number: 20034343
42nd U.S. Rock Mechanics Symposium/2nd U.S.-Canada Rock Mechanics Symposium, June 29 - July 2, 2008, San Francisco, California, ARMA 08-299. The American Rock Mechanics Association, 2008; :1-7
See Also
Application of a Convolutional Neural Network for Seismic Phase Picking of Mining-induced Seismicity
Coal Mine Safety Applications of Seismic Monitoring
Detecting Strata Fracturing and Roof Failures from a Borehole Based Microseismic System
Development of Stress Measurements and Instrument Placement Techniques for Longwall Coal
Ground Control Research: Considering Local Geology to Improve Longwall Pillar Stability
Improvements in Seismic Event Locations in a Deep Western U.S. Coal Mine Using Tomographic Velocity Models and an Evolutionary Search Algorithm
Large-Scale Strata Response to Longwall Mining: A Case Study
Microseismic Activity Associated With a Deep Longwall Coal Mine
Seismic Monitoring Strategies for Deep Longwall Coal Mines
Time-Lapse Tomography of a Longwall Panel: A Comparison of Location Schemes
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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