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Improvements to the Seismic Detection and Location Procedure.

Authors
Greenfield-RJ
Source
NTIS: PB/84-193713 :49 pages
Link
NIOSHTIC No.
10004086
Abstract
This report discusses three factors that relate to the seismic detection and location of trapped miners. (1) As part of the modeling procedure to explain the seismic waveforms observed on surface seismic subarrays, the forcetime function of the source must be known. Accelerometer records of a source timber show the force is approximately one-half sinewave and that floor blows have a longer dwell time than roof bolt blows, leading to smaller amplitude for floor blows. (2) Comparisons were made between the least squares and miner location methods using both statistical simulations and actual data. The comparisons showed the methods give similar accuracy for events inside the array with seven subarray arrival times. However, for fewer subarrays, or for events outside the array, the least squares method is more accurate. (3) Refraction surveys to determine the rock velocity used for source location calculations should be approximately 1,200 ft long.
Publication Date
19830101
Document Type
CP; Final Contract Report;
Fiscal Year
1983
NTIS Accession No.
PB84-193713
NTIS Price
A04
Identifying No.
OFR 87-84
NIOSH Division
PRC;
Source Name
NTIS: PB/84-193713
Performing Organization
Penn State Univ.
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