Location: 3 km ENE of Greenbrier, Arkansas Period: 20 Feb 2011 02:09:51 - 22 Feb 2011 18:29:46 (2 days 16 hours 19 minutes) Volcanoes in 100km radius: None Earthquakes: 43 5 swarms found nearby. 2010 S20101120.1(6.9km) 19 Nov 6 days 8 hours 103 earthquakes S20101206.1(9.1km) 5 Dec 5 days 2 hours 47 earthquakes 2011 S20110217.1(1.7km) 16 Feb 2 days 19 hours 68 earthquakes S20110228.1(2.4km) 28 Feb 4 days 7 hours 79 earthquakes S20110408.1(0.8km) 7 Apr 3 days 0 hours 54 earthquakes