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Tiltmeter data analysis windpipe project, Whitepine.
NTIS: PB/80-190572 :45 pages
Analysis of the data produced by a wide-band, sensitive, horizontal, biaxial motion sensor revealed several distinctive patterns before, during, and after a roof fall. The signals prior to the roof fall are similar in spectra, but 1,000 times larger in amplitude, than those after the roof fall. Immediately preceding the roof fall, by 2 to 12 hours, five events occurred that were larger in amplitude and lower in frequency than even the large preroof fall background signals. An interpretation of these events is presented.
CP; Final Contract Report
NTIS Accession No.
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division