Region’s fourth quake in a week hits south of Mt. Vernon

There’s been some more seismic activity in Southern Illinois, when a magnitude 2.3 earthquake hit southern Illinois late Monday night, according to the United States Geological Survey.

The USGS says it happened just before 10 p.m. about 15 miles north of Herrin and about 21 miles southwest of Mount Vernon.

Three quakes were reported last week in Pulaski County. The USGS says the first earthquake, a magnitude 2.2, happened just before 5:30 a.m. last Tuesday, about a mile west of Mound City.

The second, a magnitude 2.1, happened just before 7:30 a.m. that same day and was about 2 miles west of Mound City.

The third was a magnitude 2.2 earthquake happened on Thursday shortly before 10:20 in the morning, about 2 miles west of Mound City.