The Enola, Arkansas, Intraplate Swarm of 2001 Rabak, I. ; Langston, C. ; Bodin, P. ; Horton, S. ; Withers, M. ; Powell, C. Abstract Publication: Seismological Research Letters Pub Date: May 2010 DOI: 10.1785/gssrl.81.3.549 Bibcode: 2010SeiRL..81..549R