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Resistivity Meters & Imaging Systems
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Induced Polarization
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Electromagnetics
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Logging Probes
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Magnetic Susceptibility Meters
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Magnetometers
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Magnetic Resonance Systems
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Seismographs
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Seismometers
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Magnetotelluric
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Case Histories
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Salt Water Intrusion on A barrier Island
by
C. Rupple
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| Pseudo-section interpretation of
dipole-dipole survey conducted with a Syscal Jr. resistivity meter
along a transect perpendicular to the Atlantic coast and between tidally-influenced
sloughs on a predominately sand barrier island on the Georgia coast. The low resistivity
(high conductivity) region between 5 and 8 m depth is interpreted as corresponding to
subsurface drainage though a saline-saturated lithology. The increase in resistivity with
depth is well-constrained by data extending to 25m depth in the pseudo-section and may
represent a change in lithology and /or permeability. Data courtesy of C. Ruppel and G.
Schultz, Georgia Tech. |
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Schlumberger data collected with a Syscal Jr. resistivity meter along an airstrip running
subparallel to a tidal creek on the landward side of a barrier island on the Georgia
coast. Best-fitting, three-layer model parameters (layer thicknesses and apparent
resistivities) are shown in the lower left part of the diagram and were derived by
application of a linear filtering technique. The decrease in resistivity with depth is
loosely consistent with the transition from unsaturated to saltwater saturated sediments
with an intervening layer of freshwater-saturated material. Data courtesy of C. Rupple and
G. Schultz, Georgia Tech. |
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