Configuration and hydrology of the Pre-Cretaceous rocks underlying the southeastern Coastal Plain aquifer system

Wait, Robert L.; Davis, Marvin E.

doi:10.3133/wri864010

Cited by 8 publications

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“…2). These sedimentary units unconformably overlie igneous, metamorphic, and sedimentary rocks of Paleozoic to Mesozoic age and reach a maximum thickness of 5,500 ft just south of Glynn County in Camden County (Wait and Davis, 1986). The thickness of sedimentary units varies and is influenced by major structural features in the area, such as the Southeast Georgia Embayment, Beaufort Arch, and Gulf Trough ( fig.…”

Section: Description Of the Study Areamentioning

confidence: 99%

Simulation of groundwater flow in the Brunswick Area, Georgia, for 2004 and 2015, and selected groundwater-management scenarios

Cherry¹

2019

Scientific Investigations Report

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Section: Description Of the Study Areamentioning

confidence: 99%

Simulation of groundwater flow in the Brunswick Area, Georgia, for 2004 and 2015, and selected groundwater-management scenarios

Cherry¹

2019

Scientific Investigations Report

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An Examination of Amplification and Attenuation Effects in the Atlantic and Gulf Coastal Plain Using Spectral Ratios

Guo

Chapman

2019

Bulletin of the Seismological Society of America

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The Atlantic and Gulf Coastal Plain in the southern and southeastern United States contains extensive Cretaceous and Cenozoic sedimentary sequences of variable thickness. We investigated the difference in response of sites in the Coastal Plain relative to sites outside that region using Fourier spectral ratios from 17 regional earthquakes occurring in 2010–2018 recorded by the Earthscope transportable array and other stations. We used mean coda and Lg spectra for sites outside the Coastal Plain as a reference. We found that Coastal Plain sites experience amplification of low‐frequency ground motions and attenuation at high‐frequencies relative to average site conditions outside the Coastal Plain. The spectral ratios at high frequencies gave estimates of the difference between kappa at Coastal Plain sites and the reference condition. Differential kappa values determined from the coda are correlated with the thickness of the sediment section and agree with previous estimates determined from Lg waves. Averaged estimates of kappa reach ∼120 ms at Gulf coast stations overlying ∼12 km of sediments. Relations between Lg spectral ratio amplitudes versus sediment thickness in successive frequency bins exhibit consistent patterns, which were modeled using piecewise linear functions at frequencies ranging from 0.1 to 2.8 Hz. For sediment thickness greater than ∼0.5 km, the spectral amplitude ratio at frequencies higher than approximately ∼3 Hz is controlled by the value of kappa. The peak frequency and maximum relative amplification at frequencies less than ∼1.0 Hz depend on sediment thickness. At 0.1 Hz, the mean Fourier amplitude ratio (Coastal Plain/reference) is about 2.7 for sediment of 12 km thickness. Analysis of residuals between observed and predicted ground motions suggests that incorporating the amplification and attenuation as functions of sediment thickness may improve ground‐motion prediction models for the Coastal Plain region.

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Ground-Water Conditions and Studies in Georgia, 2006-2007

Peck¹,

Leeth²,

Painter³

2009

Scientific Investigations Report

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The U.S. Geological Survey collects groundwater data and conducts studies to monitor hydrologic conditions, better define groundwater resources, and address problems related to water supply, water use, and water quality. Water levels were monitored continuously, in Georgia, in a network of 184 wells during 2006 and 182 wells during 2007. Because of missing data or the short period of record (less than 3 years) for several of these wells, a total of 166 wells from the network are discussed in this report. These wells include 18 in the surficial aquifer system, 21 in the Brunswick aquifer system and equivalent sediments, 67 in the Upper Floridan aquifer, 15 in the Lower Floridan aquifer and underlying units, 10 in the Claiborne aquifer, 1 in the Gordon aquifer, 11 in the Clayton aquifer, 12 in the Cretaceous aquifer system, 2 in Paleozoic-rock aquifers, and 9 in crystalline-rock aquifers. Data from the network indicate that water levels generally declined from 2005 levels, with water levels in 99 wells below normal, 52 wells in the normal range, 12 wells above normal, and 3 wells with insufficient data for comparison of 5-year trends and period of record statistics. In addition to continuous water-level data, periodic synoptic water-level measurements were collected and used to construct potentiometric-surface maps for the Upper Floridan

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Configuration and hydrology of the Pre-Cretaceous rocks underlying the southeastern Coastal Plain aquifer system

Cited by 8 publications

References 0 publications

Simulation of groundwater flow in the Brunswick Area, Georgia, for 2004 and 2015, and selected groundwater-management scenarios

Simulation of groundwater flow in the Brunswick Area, Georgia, for 2004 and 2015, and selected groundwater-management scenarios

An Examination of Amplification and Attenuation Effects in the Atlantic and Gulf Coastal Plain Using Spectral Ratios

Ground-Water Conditions and Studies in Georgia, 2006-2007

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