Quakes in Yellowstone raising some questions
The small quakes include three more Friday that measured stronger than magnitude 3.0. The University of Utah Seismic Stations say the strongest was 3.5.
Several hundred quakes centered under the northern end of Yellowstone Lake have now occurred since Dec. 26. No damage has been reported.
Earthquake swarms happen fairly often in Yellowstone. But scientists say it's unusual for so many earthquakes to happen over several days.
Yellowstone lies mostly in northwestern Wyoming and is the caldera of a volcano that last erupted 70,000 years ago. Scientists have not concluded what is causing the earthquakes.
Recent comments
Six quakes in the last 24 hours or so -- I think the swarm may be...
Ed Darrell | Jan. 5, 2009 at 2:06 p.m.
Incorrect. Super eruptions have taken place every 600,000 - 800,000...
Steve O | Jan. 5, 2009 at 12:47 p.m.
I think if you check, you will discover that the last eruption was...
Rick D | Jan. 5, 2009 at 10:49 a.m.
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