Results 21 - 30 of 46

• Relationship Between Radiated Seismic Energy and Explosive Pressure for Controlled Methane and Coal Dust Explosions in an Underground Mine
  3/1/2012 - Peer reviewed journal articles
  This paper describes the research conducted to quantify a relationship between measured values of radiated seismic energy and peak explosive pressure generated.
• Improvements in Seismic Event Locations in a Deep Western U.S. Coal Mine Using Tomographic Velocity Models and an Evolutionary Search Algorithm
  9/1/2009 - Peer reviewed journal articles
  Methods of improving seismic event locations were investigated as part of a research study aimed at reducing ground control safety hazards. Results obtained using different velocity models are compared.
• High Resolution Seismic Refraction Tomography for Determining Depth of Blast Induced Damage in a Mine Wall
  8/1/2009 - Peer reviewed journal articles
  High resolution seismic refraction tomography has proved to be a useful tool to effectively estimate depth of blast induced damage in a mine face.
• Local Earthquake Tomography for Imaging Mining-Induced Changes Within the Overburden above a Longwall Mine
  7/1/2008 - Conference papers
  The objective was to determine whether a qualitative but coherent redistribution of velocity, indicating change in location of induced stress, could be imaged as mining occurred in known locations by using a local earthquake tomography software.
• Detecting Strata Fracturing and Roof Failures from a Borehole Based Microseismic System
  7/1/2008 - Conference papers
  This paper describes a case study where a surface-based microseismic system, using triaxial geophones in boreholes drilled from the surface, was deployed at a large limestone mine.
• Three-Dimensional Time-Lapse Velocity Tomography of an Underground Longwall Panel
  6/1/2008 - Peer reviewed journal articles
  This paper describes the 3D velocity tomograms that were generated to image the stress redistribution around an underground coal longwall panel to produce a better understanding of the mechanisms that lead to ground failure, especially rockbursts.
• Analysis of Seismic Signatures from Gas and Dust Based Explosions at the Lake Lynn Experimental Mine
  2/1/2008 - Conference papers
  A seismic monitoring system at NIOSH's Lake Lynn Experimental Mine has monitored gas and dust-based explosions and impact tests. Results suggest that large unrestricted explosions can generate the same magnitude as small restricted explosions.
• Time-Lapse Tomography of a Longwall Panel: A Comparison of Location Schemes
  7/1/2007 - Conference papers
  This paper describes a project in which three-dimensional time-lapse velocity tomograms were generated to image stress redistribution around a longwall panel to produce a better understanding of the mechanisms that lead to ground failure.
• Installation of a Digital, Wireless, Strong-Motion Network for Monitoring Seismic Activity in a Western Colorado Coal Mining Region
  4/1/2007 - Conference papers
  This paper describes a seismic monitoring network that has recently been installed in the North Fork Valley coal mining region of western Colorado as part of a NIOSH mine safety technology transfer project with two longwall coal mine operators.
• An Evaluation of Microseismic Activity Associated with Major Roof Falls in a Limestone Mine: a Case Study
  2/1/2007 - Conference papers
  The goal of this study was to review periods of elevated microseismic activity and determine whether fracture activity rate can be used to anticipate roof falls. The results showed that limited success would be achieved by such a system.