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NARROW
GeoRef Subject
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Africa
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Kaapvaal Craton (1)
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Asia
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oxygen
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Invertebrata
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upper Cenozoic
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Nihewan Formation (1)
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Laurentide ice sheet (1)
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Wingate Sandstone (1)
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Paleozoic
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Carboniferous
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Pennsylvanian
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Middle Pennsylvanian
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Atokan
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Atoka Formation (1)
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Minturn Formation (2)
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Devonian
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Knox Group (2)
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lower Paleozoic (1)
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Lower Ordovician
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Ellenburger Group (4)
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Montoya Group (1)
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Permian
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Lower Permian
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Supai Formation (1)
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upper Paleozoic
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Woodford Shale (2)
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upper Precambrian
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Proterozoic
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Mesoproterozoic (1)
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igneous rocks
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zircon group
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sulfides
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Primary terms
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absolute age (8)
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Africa
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Southern Africa
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Kaapvaal Craton (1)
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South Africa (1)
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Asia
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Far East
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C-14 (4)
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Caribbean region
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Arkansas earthquake 1982
Analysis of analog and digital records of the 1982 Arkansas earthquake swarm
Moment-tensor solutions for three 1982 Arkansas swarm earthquakes by waveform modeling
Determination of Source Parameters for Central and Eastern North American Earthquakes (1982–1986)
The 1982 enola, Arkansas, swarm and scaling of ground motion in the eastern United States
Comparing earthquake and injection well locations in Arkansas. (a) Arkansas...
Some recent Lg phase displacement spectral densities and their implications with respect to the prediction of ground motions in Eastern North America
Modeling Earthquake Rate Changes in Oklahoma and Arkansas: Possible Signatures of Induced Seismicity
Comments on “Some recent Lg phase displacement spectral densities and their implications with respect to prediction of ground motions in Eastern North America” by R. Street
On the relocation of earthquake clusters. A case history: The Arkansas earthquake swarm
Late Wisconsin to Holocene deformation in the New Madrid seismic zone
Characteristics of Induced/Triggered Earthquakes during the Startup Phase of the Guy–Greenbrier Earthquake Sequence in North–Central Arkansas
The repeat time of the 1811 and 1812 New Madrid earthquakes: A geological perspective
The Enola, Arkansas, Intraplate Swarm of 2001
New Madrid Seismicity, Gravity Anomalies, and Interpreted Ancient Rift Structures
The origin of Crowley's Ridge, northeastern Arkansas: Erosional remnant or tectonic uplift?
Disposal of Hydrofracking Waste Fluid by Injection into Subsurface Aquifers Triggers Earthquake Swarm in Central Arkansas with Potential for Damaging Earthquake
Seismicity of the Southeastern Margin of Reelfoot Rift, Central United States
Quaternary faulting in the southern Mississippi embayment and implications for tectonics and seismicity in an intraplate setting
ABSTRACT After the first saltwater disposal (SWD) wells associated with the development of the Fayetteville Shale became operational in April 2009, central Arkansas experienced an increase in the rate of earthquakes with M ≤4.7. This seismic activity in the Fayetteville Shale development area (FSDA) included both natural and induced earthquakes that often occurred in spatial and temporal clusters. The Center for Earthquake Research and Information (CERI) and the Arkansas Geological Survey (AGS) closely monitored the area using a permanent network of seismograph stations, augmented by portable real-time broadband stations, to focus on specific sites of suspected induced seismicity. Any concerns were communicated directly to the Arkansas Oil and Gas Commission (AOGC), the agency charged with regulating SWD wells in the state. The largest and most significant cluster of induced earthquakes in the FSDA occurred between August 2010 and July 2011, when thousands of earthquakes (M ≤4.7) occurred on the Guy-Greenbrier fault, which had not been mapped prior to the earthquakes. Since a 13-km-long fault can potentially produce a M 6 earthquake if it slips as a single event, CERI and AGS staff testified at an AOGC hearing in July 2011 that continued fluid injection into SWD wells near the fault could potentially trigger a damaging earthquake. Operators voluntarily shut down and plugged three nearby SWD wells. Another SWD well operator was ordered (by the AOGC) to shut down and plug their well. Earthquake activity dramatically decreased on the Guy-Greenbrier fault and ceased soon after shut-in, thus providing strong supporting evidence that the earthquakes were induced. The AOGC also established a moratorium that prohibited SWD well operations in the area surrounding the fault and rules governing proximity of new SWD wells to mapped faults and proximity of SWD wells to each other. When the price of natural gas rises to make development cost effective, we anticipate the new rules will help to minimize the occurrence of felt and potentially damaging earthquakes. Although the Guy-Greenbrier earthquake sequence ended in 2011, earthquakes still occurred within the FSDA. While some of these earthquakes were within 10 km of active SWD wells, many other earthquakes were not close to any SWD well. We identified 156 earthquakes M ≤3.4 from the regional catalog that occurred between 2012 and 2016 that were within 5 km of a natural-gas production well during the hydraulic fracturing window posted by the AOGC. This suggests that these earthquakes may have been induced by hydraulic fracturing.