Preliminary Assessment of a Previously Unknown Fault Zone beneath the Daytona Beach Sand Blow Cluster near Marianna, Arkansas

Research Article| September 14, 2016 Preliminary Assessment of a Previously Unknown Fault Zone beneath the Daytona Beach Sand Blow Cluster near Marianna, Arkansas Jack K. Odum; Jack K. Odum aU.S. Geological Survey, P.O. Box 25046, MS‐966, Denver, Colorado 80225‐0046 U.S.A.odum@usgs.gov Search for other works by this author on: GSW Google Scholar Robert A. Williams; Robert A. Williams aU.S. Geological Survey, P.O. Box 25046, MS‐966, Denver, Colorado 80225‐0046 U.S.A.odum@usgs.gov Search for other works by this author on: GSW Google Scholar William J. Stephenson; William J. Stephenson aU.S. Geological Survey, P.O. Box 25046, MS‐966, Denver, Colorado 80225‐0046 U.S.A.odum@usgs.gov Search for other works by this author on: GSW Google Scholar Martitia P. Tuttle; Martitia P. Tuttle bM. Tuttle & Associates, P.O. Box 345, Georgetown, Maine 04548 U.S.A.mptuttle@earthlink.net Search for other works by this author on: GSW Google Scholar Hadar Al‐Shukri Hadar Al‐Shukri cDepartment of Applied Science, University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, Arkansas 72204 U.S.A.hjalshukri@ualr.edu Search for other works by this author on: GSW Google Scholar Author and Article Information Jack K. Odum aU.S. Geological Survey, P.O. Box 25046, MS‐966, Denver, Colorado 80225‐0046 U.S.A.odum@usgs.gov Robert A. Williams aU.S. Geological Survey, P.O. Box 25046, MS‐966, Denver, Colorado 80225‐0046 U.S.A.odum@usgs.gov William J. Stephenson aU.S. Geological Survey, P.O. Box 25046, MS‐966, Denver, Colorado 80225‐0046 U.S.A.odum@usgs.gov Martitia P. Tuttle bM. Tuttle & Associates, P.O. Box 345, Georgetown, Maine 04548 U.S.A.mptuttle@earthlink.net Hadar Al‐Shukri cDepartment of Applied Science, University of Arkansas at Little Rock, 2801 South University Avenue, Little Rock, Arkansas 72204 U.S.A.hjalshukri@ualr.edu Publisher: Seismological Society of America First Online: 14 Jul 2017 Online Issn: 1938-2057 Print Issn: 0895-0695 © 2016 by the Seismological Society of America Seismological Research Letters (2016) 87 (6): 1453–1464. https://doi.org/10.1785/0220160125 Article history First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jack K. Odum, Robert A. Williams, William J. Stephenson, Martitia P. Tuttle, Hadar Al‐Shukri; Preliminary Assessment of a Previously Unknown Fault Zone beneath the Daytona Beach Sand Blow Cluster near Marianna, Arkansas. Seismological Research Letters 2016;; 87 (6): 1453–1464. doi: https://doi.org/10.1785/0220160125 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySeismological Research Letters Search Advanced Search ABSTRACT We collected new high‐resolution P‐wave seismic‐reflection data to explore for possible faults beneath a roughly linear cluster of early to mid‐Holocene earthquake‐induced sand blows to the south of Marianna, Arkansas. The Daytona Beach sand blow deposits are located in east‐central Arkansas about 75 km southwest of Memphis, Tennessee, and about 80 km south of the southwestern end of the New Madrid seismic zone (NMSZ). Previous studies of these sand blows indicate that they were produced between 10,500 and 5350 yr B.P. (before A.D. 1950). The sand blows are large and similar in size to those in the heart of the NMSZ produced by the 1811–1812 earthquakes. The seismic‐reflection profiles reveal a previously unknown zone of near‐vertical faults imaged in the 100–1100‐m depth range that are approximately coincident with a cluster of earthquake‐induced sand blows and a near‐linear surface lineament composed of air photo tonal anomalies. These interpreted faults are expressed as vertical discontinuities with the largest displacement fault showing about 40 m of west‐side‐up displacement at the top of the Paleozoic section at about 1100 m depth. There are about 20 m of folding on reflections within the Eocene strata at 400 m depth. Increasing fault displacement with depth suggests long‐term recurrent faulting. The imaged faults within the vicinity of the numerous sand blow features could be a causative earthquake source, although it does not rule out the possibility of other seismic sources nearby. These newly located faults add to a growing list of potentially active Pleistocene–Holocene faults discovered over the last two decades that are within the Mississippi embayment region but outside of the historical NMSZ. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.