Huntington, Utah (AP) The University of Utah seismograph stations says the cave-in at a central Utah mine generated 3.9 magnitude seismic waves.
The movement was reported earlier today as an earthquake of a magnitude of 4.0.
Six miners are believed trapped in the collapsed mine. Officials say they are 1,500 feet below ground and about 4 miles from the mine entrance.
Dirk Fillpot, a spokesman at the Mine Safety and Health Administration in Washington, D.C., says rescuers were within 2,500 feet of the miners. but he had no other information about their conditions or the difficulty of the search.
The Genwal mine is about 100 miles south of Salt Lake City near the town of Huntington.
The seismograph station says there is no evidence that an earthquake triggered a mine collapse. instead, evidence