"These events seem to be related to the ongoing settling of the rock mass following the main collapse on Aug. 6," said Relu Burlacu, a network manager for the U. Seismograph Stations.

Reviewing a year's worth of seismic events has found less than 2 percent of the "quakes" in Utah's coal country are natural earthquakes. The other 98 percent appear to be mining-induced.

Mine owner Bob Murray has disagreed with seismologists over what caused the Aug. 6 mine collapse. He insists it was an earthquake, yet scientists disagree and say it was the mine collapse that was the seismic event.

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Contributing: Lois Collins; Lisa Riley-Roche; Rebecca Palmer; Angie Welling, Deborah Bulkeley

E-mail: bwinslow@desnews.com; preavy@desnews.com