Jackson, Wyo. » 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.