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Figure 2 Map of the historical seismicity in the Guy-Greenbrier area 1976 to 2009, including the Enola swarm. SOURCE: Horton (2012).

was placed to allow time to investigate “a potential correlation between the seismic activity and disposal well operations in the Guy-Greenbrier, Arkansas area” (AOGC, 2011). In the surrounding Fayetteville shale development area outside the Permanent Moratorium Area, the AOGC director may propose additional requirements for any new disposal wells (AOGC, 2011).


a See AOGC (2011) for a detailed map of the AOGC’s proposed Permanent Moratorium Area for disposal wells.

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