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AGS / Maps & Data / Geohazard Maps / Enola Swarm

Number Series GH-EQ-Enola-002
Title Enola Swarm Area of Faulkner County, Arkansas
Author (s) S.M. Ausbrooks and Erica Doerr
Date 2007
General Description This map represents a sampling of seismic events recorded near the town of Enola in central Arkansas. This seismically active area is known as the “Enola swarm area.” The first seismic event recorded here was a 1.2 magnitude earthquake that occurred on January12, 1982. Over 40,000 seismic events have occurred in the Enola swarm area since 1982, making it possibly the largest seismic swarm ever recorded in the central United States (Chiu et al., 1984). Most of the seismic events are microquakes, but numerous felt events have been experienced. During the first year of seismic activity, at least 93 earthquakes were felt in the Enola swarm area by at least one person.

We extend our appreciation to John David.McFarland III for compiling the original earthquake database used to make this map and for sharing his knowledge of Arkansas.Seismicity.  We would also like to thank the Center for Earthquake Research and Information (CERI) at the University of Memphis for seismic data used to generate this map.

  • Color Map
  • Paper size ~ 24" x 24"
Availability Yes.  Paper copy (Print-on-Demand); CD-Rom or Free download as a .pdf file.
Price Paper-$10.00 plus shipping; CD-rom-$25.00 plus shipping or free download

Contact Sales Office at (501) 296-1877,  for shipping and handling charges.

Online Version Download PDFpdf    ( 7.5 MB file)

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Contact Information Arkansas Geological Survey
3815 West Roosevelt Road
Little Rock, AR  72204
(501) 296-1877 or  (501) 296-1878

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Arkansas Geological Survey
Vardelle Parham Geology Center
3815 West Roosevelt Road
Little Rock, AR 72204
Phone: 501-296-1877 | Fax: 501-663-7360
Business Hours: Monday - Friday 8:00am - 4:30pm

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