The U.S. Geological Survey says four more small earthquakes were recorded Oct. 15 in northern Faulkner County, Arkansas.
According to a list of earthquakes on the USGS Web site, the earliest quake recorded was one of magnitude 3.8 at 5:20 a.m., about two miles south of Guy. Next came a magnitude 2.4 quake at 7:19 a.m., about three miles south of Guy. That was followed by a magnitude 3.0 quake at 1:40 p.m., three miles northeast of Greenbrier, and a quake of magnitude 2.0 at 4:02 p.m., two miles south of Guy.
No damage or injuries were reported.
Researchers say quakes of 2.5 to 3.0 magnitude are typically the smallest felt by humans.
A number of small earthquakes in the area have been reported for months, and geologists have installed sensors to better understand why the quakes are occurring.
Officials have said the cause is unclear.
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