Richard C. Aster William L. Yeck Daniel E. McNamara Harley M. Benz Nicole D McMahon 2017 <p><span>The 6 November 2011&nbsp;</span><strong>M</strong>_{<strong>w</strong>}<span><span>&nbsp;</span>5.7 earthquake near Prague, Oklahoma is the second largest earthquake ever recorded in the state. A<span>&nbsp;</span></span><strong>M</strong>_{<strong>w</strong>}<span><span>&nbsp;</span>4.8 foreshock and the<span>&nbsp;</span></span><strong>M</strong>_{<strong>w</strong>}<span><span>&nbsp;</span>5.7 mainshock triggered a prolific aftershock sequence. Utilizing a subspace detection method, we increase by fivefold the number of precisely located events between 4 November and 5 December 2011. We find that while most aftershock energy is released in the crystalline basement, a significant number of the events occur in the overlying Arbuckle Group, indicating that active Meeker-Prague faulting extends into the sedimentary zone of wastewater disposal. Although the number of aftershocks in the Arbuckle Group is large, comprising ~40% of the aftershock catalog, the moment contribution of Arbuckle Group earthquakes is much less than 1% of the total aftershock moment budget. Aftershock locations are sparse in patches that experienced large slip during the mainshock.</span></p> application/pdf 10.1002/2017GL072944 en American Geophysical Union Spatio-temporal evolution of the 2011 Prague, Oklahoma aftershock sequence revealed using subspace detection and relocation article