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A minor earthquake and aftershock occurred near Soda Springs late Tuesday, but no injuries or damages were reported, the Caribou County sheriff's office said.

The epicenter was two miles southwest of Soda Springs and the quake at 11:04 p.m. registered 3.5 on the Richter scale, said Sue Nava, senior staff seismologist at the University of Utah Seismograph Stations in Salt Lake City.The aftershock, with a magnitude 2.2, followed at 11:18 p.m., she said Wednesday.

Sheriff's dispatcher Barbara Cohlmeyer said the quake occurred in an active seismological region, but only one person had telephoned to say he felt it.

The Richter scale is a gauge of the energy released by the ground motion recorded on a seismograph. Every increase of one number means that the ground motion is 10 times greater.

A quake of magnitude 2 is the smallest normally felt by humans. A quake of 3.5 can cause slight damage.