Publications
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Interstitial water studies on small core samples, Leg 22 Interstitial water studies on small core samples, Leg 22
Interstitial waters from Leg 22 in the Indian Ocean revealed two unique results: Site 214, on the Ninetyeast Ridge, penetrated through a 30-meter sequence of fine-grained basalt and reentered hard, silty clay containing carbonate skeletal debris. Such a basalt layer may well have been impervious and extensive enough to seal off underlying (fossil) seawater of Paleocene age. However...
Authors
Frank T. Manheim, Lee S. Waterman, Frederick L. Sayles
Diffusimetry (diffusion constant estimation) on sediment cores by resistivity probe Diffusimetry (diffusion constant estimation) on sediment cores by resistivity probe
Measurement of formation factor (ratio of rock resistivity to interstitial water resistivity) from sediment cores provides an indirect measurment of the tortuosity of the fluid channels in the sediments. From these measurements one can estimate the diffusion coefficient of the sediment with depth. The F (formation factor) values for Indian Ocean sediments varied from 1.6 for a clayey...
Authors
Frank T. Manheim, Lee S. Waterman
Deposition of zinc and cadmium by marine bacteria in estuarine sediments Deposition of zinc and cadmium by marine bacteria in estuarine sediments
Mixed cultures of marine bacteria isolated from the sediments of Corpus Christi Harbor were examined for their ability to assimilate or precipitate radioactive zinc and cadmium from solution. Test data indicate that during summer, when bacterial activity is at a maximum, the bacteria and their metabolic byproducts play a significant role in the removal of zinc and cadmium from seawater...
Authors
C.J. McLerran, Charles W. Holmes
Landslide susceptibility map of part of the New Kensington East 7 1/2-minute Quadrangle, Allegheny County and vicinity, Pennsylvania Landslide susceptibility map of part of the New Kensington East 7 1/2-minute Quadrangle, Allegheny County and vicinity, Pennsylvania
No abstract available.
Authors
W.E. Davies
Landslides Landslides
No abstract available.
Authors
Water Resources Division U.S. Geological Survey
Geology and mineral deposits of Churchill County, Nevada Geology and mineral deposits of Churchill County, Nevada
Churchill County, in west-central Nevada, is an area of varied topography and geology that has had a rather small total mineral production. The western part of the county is dominated by the broad low valley of the Carson Sink, which is underlain by deposits of Lake Lahontan. The bordering mountain ranges to the west and south are of low relief and underlain largely by Tertiary volcanic...
Authors
Ronald Willden, Robert C. Speed
Effects of local geology on ground motion in the San Francisco Bay region, California: A continued study Effects of local geology on ground motion in the San Francisco Bay region, California: A continued study
Measurements of ground motion generated by nuclear explosions in Nevada have been completed for 99 locations in the San Francisco Bay region, California. The seismograms, Fourier amplitude spectra, spectral amplification curves for the signal, and the Fourier amplitude spectra of the seismic noise are presented for 60 locations. Analog amplifications, based on the maximum signal...
Authors
James F. Gibbs, Roger D. Borcherdt