JUNE 20, 2005 - Posted at 8:57 a.m. CDT
CLINTON, KY - The National Earthquake Center reports an earth tremor this morning measuring 3.9 near Clinton, Kentucky.
The earthquake at around 7:21 was felt in four states and was the second in under twelve hours in the area. The tremor was centered nearly on top of the Mississippi River.
A dispatcher at the Kentucky State Police office in Mayfield said it felt as if the floor was moving. She said it was like the floor turned to water for a few seconds.
An earlier earthquake about 15 miles away registered 3.0 on the Richter scale.
Quakes of 4.0 or stronger occur only about once every 18 months or so in the New Madrid Fault region.
There have been three this year with the latest earlier this month near Ridgely, Tennessee.
But researchers say that does not mean another one is likely soon or a bigger one is on the way.