Master of Science
Roy B. Van Arsdale
Randel T. Cox
The Joiner Ridge horst and Meeman-Shelby fault (MSF) are of particular earthquake concern because of their proximity to Memphis, Tennessee. Seismic reflection profiles of the MSF and Joiner Ridge horst show vertical displacement of subsurface Quaternary alluvium of 28 m and 20 m, respectively. We obtained two continuous cores of Mississippi River alluvium on the uplifted blocks of the MSF and Joiner Ridge horst and obtained OSL dates of the vertically displaced basal alluvium. The stratigraphy of the MSF core demonstrates a fining upward point bar sequence, with the lower 4 m of the alluvial section being 14.30 ka glacial outwash. The Joiner Ridge core exhibits a thick Holocene overbank unit underlain by at least two coarse-grained glacial outwash units, the oldest being 20.32 ka. The ages of the displaced basal alluvium yield displacement rates of 2.0 mm/yr for the MSF and 1.0 mm/yr for the Joiner Ridge horst.
Dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.
Ward, Alex Corbin, "Progress Toward Quaternary Displacement Rates on the Meeman-Shelby Fault and Joiner Ridge Horst, Eastern Arkansas" (2016). Electronic Theses and Dissertations. 1409.