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Yellowstone earthquake swarm dwindles

Published February 10, 2010 11:16 am

This is an archived article that was published on sltrib.com in 2010, and information in the article may be outdated. It is provided only for personal research purposes and may not be reprinted.

Yellowstone National Park earthquake researchers say a series of more than 1,800 small temblors that have rattled the park for nearly a month are dwindling.

The earthquake swarm began Jan. 17 near West Yellowstone, Mont. Robert Smith, a University of Utah professor of geophysics and coordinating scientist for the Yellowstone Volcano Observatory, says it's the largest swarm since a 1985 series that lasted three months.

The latest swarm is clustered in a region about six miles long and is focused about five miles below the surface of the earth. It's included nearly a dozen earthquakes that were magnitude 3 or larger.

Smith says he doesn't think the quakes have stopped altogether, but he says activity has diminished to the point where researchers are no longer filing daily swarm reports.