Results 21 - 30 of 37

• 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.
• Forecasting Roof Falls with Monitoring Technologies - A Look at the Moonee Colliery Experience
  8/1/2005 - Conference papers
  Monitoring technology and techniques can provide a means to warn of hazardous roof fall conditions. Measuring roof deflection is the most common method of detecting roof instabilities.
• Characteristics of Mining-Induced Seismicity Associated with Roof Falls and Roof Caving Events
  6/1/2005 - Conference papers
  This study used microseismic emissions to help identify three local rock failure processes. It was also shown that analysis of microseismic emissions can aid in assessing the degree of instability associated with these local rock failure processes.
• Mapping Hazards with Microseismic Technology to Anticipate Roof Falls - A Case Study
  8/1/2004 - Conference papers
  More that 700 microseismic emissions were collected from two underground limestone mine roof fall areas in southwestern PA. Results reveal much about the behavior of strata prone to failure and allow for the construction of hazard maps.
• The Relationship of Roof Movement and Strata-Induced Microseismic Emissions to Roof Falls
  2/1/2004 - Conference papers
  This paper examines the capabilities of convergence and microseismic monitoring systems to better understand roof rock failure mechanics and anticipate falls. Understanding these techniques is critical in developing effective ground control strategy.
• Seismic Event Data Acquisition and Processing: Distribution and Coordination Across PC-Based Networks
  2/1/2002 - Conference papers
  NIOSH has developed an automated PC-based seismic event (induced earthquake) monitoring system for use in mine ground control studies. This paper describes system design philosophy, hardware/software components, installation examples, and results.
• Development of an Automated PC-Network-Based Seismic Monitoring System
  12/1/2001 - Conference papers
  An automated PC-network-based seismic data acquisition and processing system has been developed by NIOSH for use in mine safety studies. Several systems have been constructed and deployed in the field for testing and application. These systems are now b...