© USGS
The U.S. Geological Survey says a temblor with a magnitude of 3.0 struck early Tuesday about 25 miles northwest of the ghost town of Jeffrey City.
The quake comes almost a week after another minor earthquake struck Wright. A 3.2 magnitude earthquake struck at 10:16 p.m. Thursday. It happened just 7 miles northeast of Wright, about 5 miles underground.
At first the USGS thought it might be a mine blast, but later deemed it a genuine earthquake.
David King, Campbell County's emergency management coordinator, said the county sits on several fault lines which have caused 10 recorded earthquakes since 1967.
Thursday's quake is the county's fourth quake since 2000. Quakes in 2009, 2008 and 2004 all occurred about 17 miles underground away from Gillette at a magnitude of about 2.5.
The county's largest earthquake occurred in September 1984 west of Gillette by the Johnson County line at a magnitude of 5.1. There were two other earthquakes in the county that year - a magnitude 5 and 2.5.
There are no recorded earthquakes in Gillette.
