Composite Source Mechanism Solutions for Rockbursts at the Lucky Friday Mine, Mullan, Idaho

Details

• Personal Author:
  Girard, Jami M. ; Nichols TL ; Wideman CJ ; Williams, Theodore J.
• Description:
  U.S. Bureau of Mines researchers have analyzed full-waveform digital seismic records from moderate-to-large rockburst events at the Lucky Friday Mine, Mullan, ID. The goal of this work is to characterize source mechanisms for rockburst events. Because the seismometer array used for the recordings usually consists of fewer than 10 instruments, a method of obtaining composite source solutions has been developed. These solutions are determined by selecting events with similar arrival patterns at the seismometer array and with hypocentral locations in the same general region of the mine. Some events have all-dilatational first arrivals, while others display arrival patterns with both compressional and dilatational arrivals. There are at least three types of events in the mine. Some of the more complex arrival patterns seem to be associated with right-lateral, strike-slip motion, while others seem to be associated with left-lateral or dip-slip movement. The type of event seems to be independent of source location, although geologic conditions in different regions vary. Even though there is a fundamental difference in the geometry of the mining environment, the three types of events are still recognizable. This work is continuing, and data from all large events (Richter magnitude, m L > 2.0) at the mine are being analyzed and added to a database. [Description provided by NIOSH]
• Subjects:
  Geology Mining Occupational Health Safety
• Keywords:
  Ground-stability Mining-industry Region-10 Rock-bursts Rock-mechanics Structural-analysis
• Series:
  Mining Publications
• ISBN:
  9054103808
• Publisher:
  A.A. Balkema
• Document Type:
  Text
• Genre:
  Journal Article ; Proceedings
• Place as Subject:
  Idaho ; Montana ; OSHA Region 10 ; OSHA Region 6 ; OSHA Region 8 ; Texas ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  SRC - Spokane Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• NIOSHTIC Number:
  nn:10012405
• Citation:
  Rock mechanics: models and measurements, challenges from industry - proceedings of the 1st North American Rock Mechanics Symposium, June 1-3, 1994, Austin, Texas. Nelson PP, Laubach SE, eds. Rotterdam: A.A. Balkema, paper no. ARMA-1994-0977, 1994 Jun; :977-985
• Editor(s):
  Nelson PP; Laubach SE
• Federal Fiscal Year:
  1994
• Peer Reviewed:
  False
• Source Full Name:
  Rock mechanics: models and measurements, challenges from industry - proceedings of the 1st North American Rock Mechanics Symposium, June 1-3, 1994, Austin, Texas
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:3340c31cfe333147e1a98cef933b336245601d339a820d4d22869306aaa671fa600e43ee31fee766da3073e01cf37bc858b9b656c0d4075fd934d348694a970d
• Download URL:
  https://stacks.cdc.gov/view/cdc/220291/cdc_220291_DS1.pdf
• File Type:
  [PDF - 342.90 KB ]