The ground in southwestern Indiana is being watched more closely since a June 18 earthquake shook the region.
Monitors installed in Vanderburgh County a few days after the quake have recorded no seismic movements.
The head of the geology department at the University of Southern Indiana, Paul Doss, says the lack of aftershocks is a bit surprising.
The research is meant to explore the seldom-documented Wabash Valley Fault.
Last month's earthquake measured 5.0 in magnitude and caused little damage. However, it was felt at least 250 miles away, including across portions of Kentucky.
Viewers with disabilities can get assistance accessing this station's FCC Public Inspection File by contacting the station with the information listed below. Questions or concerns relating to the accessibility of the FCC's online public file system should be directed to the FCC at 888-225-5322, 888-835-5322 (TTY), or email@example.com.