Arkansas Hit With Mild 3.9-Magnitude Quake It's the third North American quake since yesterday By Kevin Spak, Newser User Posted Oct 29, 2012 9:06 AM CDT 7 comments Comments Official at National Seismic Monitoring Center Peshawar, Pakistan, monitors the aftershock recorded at Richter Scale in this 2008 file photo. (AP Photo/Shabbir Hussain Imam) (Newser) – Apparently the planet is cranky today. As if Hurricane Sandy weren't enough, Arkansas got a jolt from a 3.9-magnitude earthquake this morning, the US Geological Survey announced. The quake hit near the Tennessee border, at a depth of about 3.2 miles, according to CNN. The quake is the third of note to hit North America since yesterday morning, following another 3.9 affair in downtown LA and a 7.7 off the coast of Canada.