Progress Toward Quaternary Displacement Rates on the Meeman-Shelby Fault and Joiner Ridge Horst, Eastern Arkansas

Ward, Alex C.; Counts, Ronald C.; Arsdale, Roy B. Van; Larsen, Daniel; Carmichael, John K.; Hileman, G.E.

doi:10.1130/abs/2016se-273126

Cited by 3 publications

(1 citation statement)

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“…Within Lake County the Jackson Formation may be locally absent due to erosional scouring by the Mississippi River and due to the difficulty in differentiating the Jackson and Cockfield FIGURE 4 | Generalized stratigraphic column of West Tennessee. Quat., Quaternary; Neo., Neogene; EGRP, Eastern Granite-Rhyolite Province [modified from Parrish and Van Arsdale (2004) and Ward (2016)].…”

Section: Geologic History Of the Central Mississippi River Valleymentioning

confidence: 99%

Lake County, Tennessee, in the Heart of the New Madrid Seismic Zone

Weathers

Arsdale

2019

Front. Earth Sci.

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Lake County, Tennessee, lies within the center of the New Madrid seismic zone, and thus is particularly vulnerable to seismic hazards. To better evaluate the seismic threat to Lake County, the stratigraphy and structure were mapped beneath the county. A shallow 3-D lithologic model was constructed to illustrate the Quaternary Mississippi River alluvial facies of Lake County in five-foot (1.5 m) thick layers to a depth of 300 feet (91.4 m). This model provides near-surface geologic data for the determination of earthquake liquefaction potential and illustrates the Mississippi River alluvial aquifer for optimum agricultural water exploitation. In addition, faulted structure contour maps were made of the tops of the unconformable Paleozoic, Cretaceous, and Eocene sections. With these structure contour maps a deep 3-D geologic model was built for Lake County, which shows the stratigraphy and structure from the Quaternary to the Paleozoic. Crosssections were also created to illustrate the subsurface geology. The faulted structure contour maps and cross-sections reveal Quaternary faulting on the Reelfoot North, Axial, Tiptonville dome back thrust, Lake County uplift back thrust, Cottonwood Grove, Ridgely, and previously unidentified faults. The maps also illustrate where surface fault rupture may occur and the sense of vertical surface displacement in the event of a future large earthquake.

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Section: Geologic History Of the Central Mississippi River Valleymentioning

confidence: 99%

Lake County, Tennessee, in the Heart of the New Madrid Seismic Zone

Weathers

Arsdale

2019

Front. Earth Sci.

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Quaternary Displacement Rates on the Meeman‐Shelby Fault and Joiner Ridge Horst, Eastern Arkansas: Results from Coring Mississippi River Alluvium

Ward

Counts

Arsdale

et al. 2017

Seismological Research Letters

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Quaternary Displacement on the Joiner Ridge Fault, Eastern Arkansas

Price

Woolery

Counts

et al. 2019

Seismological Research Letters

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The New Madrid seismic zone of the central United States is an intraplate seismic zone with blind structures that are not seismically active but may pose seismic hazards. The Joiner ridge fault (JRF) is the 35‐kilometer‐long east‐bounding fault of the Joiner ridge blind horst located in eastern Arkansas ∼50 km northwest of Memphis, Tennessee. Shallow S‐wave (SH‐mode) seismic reflection profiles, continuous cores, and radiometric dating of Quaternary alluvium across the JRF reveal down‐to‐the‐east reverse faulting and folding of Eocene strata and overlying Quaternary Mississippi River alluvium. The base of the Quaternary alluvium has an age of 20.3 ka and is vertically displaced 12 m, resulting in an average slip rate of 0.6±0.1 mm/yr over the past 20.3 ka. The overlying upper Wisconsinan and Holocene alluvial facies are also displaced by the JRF. These facies increase in thickness across the JRF and were used to calculate late Wisconsinan and Holocene slip histories. The JRF slipped 7 m between 20.3 and 17.5 ka, 3 m between 12.3 and 11.5 ka, and 2 m between 11.5 and 8.9 ka. No apparent slip occurred on the JRF within the last 8.9 ka. This research illustrates that slip has been intermittent and that slip magnitudes on the JRF diminished through the late Wisconsinan and early Holocene.

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Progress Toward Quaternary Displacement Rates on the Meeman-Shelby Fault and Joiner Ridge Horst, Eastern Arkansas

Cited by 3 publications

References 0 publications

Lake County, Tennessee, in the Heart of the New Madrid Seismic Zone

Lake County, Tennessee, in the Heart of the New Madrid Seismic Zone

Quaternary Displacement Rates on the Meeman‐Shelby Fault and Joiner Ridge Horst, Eastern Arkansas: Results from Coring Mississippi River Alluvium

Quaternary Displacement on the Joiner Ridge Fault, Eastern Arkansas

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