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Segmentation of the Eastern Reelfoot Rift Margin: Reinterpretation of the Northeastern Reelfoot Rift Fault Geometry and Seismic Potential
Watts Bar Nuclear Power Plant Strong‐Motion Records of the 12 December 2018 M 4.4 Decatur, Tennessee, Earthquake
Where was the 31 October 1895 Charleston, Missouri, Earthquake?
Earthquake Early Warning Feasibility Study for the New Madrid Seismic Zone
Stratigraphic architecture of the Mississippian limestone through integrated electrofacies classification, Hardtner field area, Kansas and Oklahoma
Rupture Directivity of the 18 April 2008 Mt. Carmel, Illinois, Earthquake from Modeling of Local Seismic Waveforms
2018 Seismology of the Americas Meeting
Update of the Urban Seismic and Liquefaction Hazard Maps for Memphis and Shelby County, Tennessee: Liquefaction Probability Curves and 2015 Hazard Maps
Probabilistic Seismic and Liquefaction Hazard Analysis of the Mississippi Embayment Incorporating Nonlinear Effects
On the Amplitude Discrepancy of HVSR and Site Amplification from Strong‐Motion Observations
Probabilistic Seismic‐Hazard Analysis Including Earthquake Clusters
Stratigraphy and structure of the Eocene Memphis Sand above the eastern margin of the Reelfoot rift in Tennessee, Mississippi, and Arkansas, USA
Velocity Structure of the Northern Mississippi Embayment Sediments, Part I: Teleseismic P ‐Wave Spectral Ratios Analysis
Imaging Shallow Crustal Structure in the Upper Mississippi Embayment Using Local Earthquake Waveform Data
Estimation of the Coda‐Wave Attenuation and Geometrical Spreading in the New Madrid Seismic Zone
Redescriptions of some Lower Devonian gastropods from Tennessee currently considered to be platyceratids
Validation of Attenuation Models for Ground Motion Applications in Central and Eastern North America
The origin of clays and clay minerals in the Paleocene Clayton (CF) and Porters Creek (PCF) Formations within the Mississippi embayment of central North America has been debated for more than 50 years. X-ray diffraction and petrographic analysis of samples of the CF and PCF from a mine in southeastern Missouri are used to evaluate contributions from Cretaceous-Paleogene (K-Pg) impact debris and the role of sediment diagenesis in the fine-grained sediment. Expandable clay minerals increase in abundance relative to illite and kaolinite above the K-Pg unconformity in the CF and PCF, and include dioctahedral smectite, vermiculite, and minor mixed-layered clay components, along with trioctahedral smectitic clays in the CF and lowermost PCF. Additional diagenetic phases include clinoptilolite (in the CF and lower PCF), pyrite, siderite, and opal CT (mainly in the PCF). The results of the petrographic analysis show no evidence for volcanic ash contributing directly to the sediment in the PCF. The detrital silicate minerals are mainly quartz, muscovite, biotite, and metamorphic minerals, consistent with an ancestral Appalachian Mountains source rather than volcanic ash or a Cretaceous western interior sediment source. The illite, kaolinite, dioctahedral smectite, and ordered illite-smectite mixed-layered clays are present in varying quantities in Cretaceous through Paleogene marine and nonmarine mudstones from the Mississippi embayment, and appear to be detrital in origin. Trioctahedral smectite and clinopti-lolite in the CF and lowermost PCF are argued to derive from alteration of glassy impact debris; clasts in the basal CF contain microtektites replaced by trioctahedral smectitic mixed-layered clay with randomly interstratified illite. The X-ray diffraction characteristics of the vermiculite in the PCF indicate a hydroxyl-interlayered aluminous variety that is argued to have a diagenetic origin, formed by clay mineral reactions under variably anoxic conditions in the PCF sediments during early diagenesis. Throughout the CF and PCF, pyrite precipitated under reducing conditions during diagenesis, locally along with siderite replacement of micritic carbonate. In addition, opal-CT precipitated as a result of silicate reactions and dissolution of diatoms under alkaline conditions and replaced matrix and calcitic microfossils throughout much of the upper PCF.