Guy–Greenbrier earthquake swarm

The Guy–Greenbrier earthquake swarm occurred in central Arkansas beginning in August 2010.^[2] The epicenters of earthquakes in the swarm showed a linear distribution, with a clear overall shift in activity towards the southwest with time,^[3] and the largest event in the swarm was the 2011 Arkansas earthquake, at 4.7 on the moment magnitude scale.^[3]

Guy–Greenbrier earthquake swarm

Map of earthquake epicenters for the period August 6, 2010 to March 1, 2011
UTC time	??
ISC event	n/a
USGS-ANSS	n/a
Local date	2010–11
Duration	Less than one year
Type	Intraplate earthquakes
Areas affected	Central Arkansas
4.7 Mw
Total events	150–160 earthquakes[1]

Cause

It has been suggested that the swarm was triggered by drilling activities associated with the exploration and production of shale gas in the Fayetteville Shale in northern Arkansas. Analysis of the swarm has found no link between this relatively shallow drilling and the earthquakes, but has instead suggested a link with deep waste disposal drilling similar to that identified at the Rocky Mountain Arsenal in the 1960s, and has led to a moratorium on such drilling being proposed covering an area of 1150 square miles (2980 km²).^[4]

See also

• List of earthquakes in 2010
• List of earthquakes in 2011
• List of earthquakes in the United States
• Enola earthquake swarm
• Oklahoma earthquake swarms (2009–present)