Temporary field-recording networks were installed at Gentry Mountain and Little Park Wash, Utah, during the summers of 1967 and 1968 respectively, to study seismic activity related to coal mining and geologic conditions. Tremors, many of which were small manmade earthquakes, were recorded both on chart paper and on magnetic tape; instruments were designed or modified to operate for extended periods with minimum maintenance. Hypocenter positions were estimated to be accurate within 750 feet. Results at Gentry Mountain indicated that tremors occur near mining areas and along large north-trending faults west of the mining area. At Little Park Wash they indicated that nearly all tremors originated near the south part of the Geneva mine. A well-defined belt of faults crossing Little Park Wash 5 miles south of the mine was seismically quiet.
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