Thesis Defense Announcement
College of Arts and Sciences announces the Final Thesis Defense of
for the Degree of Master of Fine Arts
April 3, 2019 at 11:00 AM in Johnson Hall, Room 216
Advisor: Roy Van Arsdale
Quaternary Displacement Rates on a Meeman-Shelby Fault and the East-Bounding Fault of the Joiner Ridge Horst, Eastern Arkansas
ABSTRACT: The Meeman-Shelby fault (~8 km from Memphis) and the Joiner Ridge horst (~54 km from Memphis) are two blind structures in the Mississippi River floodplain of northeastern Arkansas that have no modern seismicity but do have reported Quaternary displacement. Cores collected on the down-thrown sides of both the Meeman-Shelby fault and east-bounding fault of Joiner Ridge show upward fining alluvium and top-of-Eocene at depths of 36.5 m and 35.5 m, respectively. Seismic reflection profiles and radiometric dates permitted the calculation of slip rates on two faults. A fault within the Meeman-Shelby fault zone has 4-m of displacement at a depth of 10-m on sediment dated at 11,250 ± 50 ka thus indicating a Holocene slip rate of 0.36 mm/yr. The Joiner Ridge east-bounding fault has 12-m of displacement at a depth of 40-m on sediment dated at 20,320 ± 63 ka thus indicating a Quaternary slip rate of 0.59 mm/yr.