Feasibility Study of Detecting Voids by Shear Wave Refraction Methods.
NTIS: PB/262-242 Available for Reference At Bureau Libraries :69 pages
This study was performed to examine the feasibility of using seismic shear waves to detect the presence of abandoned coal mines. The Antiquity, a coal mine near Antiquity, Ohio, was used as a region of known voids. No attempt was made in this study to accurately locate the mine tunnels if detection was obtained. The results of this study were positive. Sharp changes in the amplitude of the received shear waves were clear indications of the presence of a fluid (gas or liquid) filled region between the source and receivers. When moving the source showed no change in the received signals it was concluded that the voids existed beneath the sensors. Prior to the tests, drilling had determined that a void did exist in the test area. This void was confirmed by the shear wave test, and two additional voids were found.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/262-242 Available for Reference At Bureau Libraries
Southern Ohio Coal Company