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UTAH EARTH DIDN’T QUAKE - A.F. BOMBS MADE IT SHAKE

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Buildings shook throughout a large part of northern Utah on Friday, seismograph needles quivered, and many residents feared an earthquake had struck the Wasatch Fault.

But they were wrong: It was Air Force bombs."We've gotten tons of phone calls," said Jim Pechmann of the University of Utah Seismograph Stations. Starting at 11:42 a.m., four large concussions were recorded within two minutes, registering on earthquake detection instruments in several locations.

Sylvia LeMons, spokeswoman for Hill Air Force Base, said, "We had four F-111s from Mountain Home (Air Force Base), Idaho, flying at the Utah Test and Training Range this morning," west of the Great Salt Lake.

On a routine mission, the jets swooped down with 500-pound bombs, "dropping three or four at a time."

Buildings trembled from Ogden to Salt Lake City. LeMons said the humid atmosphere may have conducted vibrations more effectively than usual. But, she said, no damage was reported.