Two small earthquakes struck the Greenbrier area about 12 hours apart Thursday.
The first earthquake, which occurred at 1:55 a.m., was measured at 2.8 on the Richter scale by the U.S. Geological Survey.
The second earthquake, which occurred at 1:53 p.m., was measured at 2.7.
Veronica Villalobos-Pogue, earthquake program manager/natural hazards planner, at the Arkansas Department of Emergency Management, said ADEM is monitoring the earthquake activity along with the Arkansas Geological Survey.
"They (Arkansas Geological Survey) are working closely with the Center for Earthquake Research and Information (CERI) and the UALR-Arkansas Center for Earthquake Education and Technology Transfer to better understand the source of these small tremors," Villalobos-Pogue said. "There is no scientific evidence to connect these recent earthquakes with the New Madrid seismic zone of northeast Arkansas, where the earthquake threat is well known."
The first earthquake was described as having Level 1 intensity meaning no shaking was felt. The second quake had a Level 2 intensity meaning weak shaking was felt.