Skip to main content
U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Results

184617 results.

Alternate formats: RIS file of the first 3000 search results  |  Download all results as CSV | TSV | Excel  |  RSS feed based on this search  |  JSON version of this page of results

Page 4900, results 122476 - 122500

Show results on a map

Publication Extents

Not all publications have extents, not all extents are completely accurate
RECOVERY OF FRESHWATER STORED IN SALINE AQUIFERS IN PENINSULAR FLORIDA.
Michael L. Merritt
1986, Conference Paper
Subsurface freshwater storage has been operationally tested at seven sites in central and south Florida. Injection was into a high chloride water aquifer at six sites, and into a high sulfate water aquifer at the seventh. Recovery efficiency has ranged from 0 to 75 percent in high chloride water aquifers,...
SIMULATION OF FLOOD HYDROGRAPHS FOR GEORGIA STREAMS.
E. J. Inman, J.T. Armbruster
1986, Transportation Research Record 15-23
Flood hydrographs are needed for the design of many highway drainage structures and embankments. A method for simulating these flood hydrographs at urban and rural ungauged sites in Georgia is presented. The O'Donnell method was used to compute unit hydrographs from 355 flood events from 80 stations. An average unit...
EFFECTS OF DRAIN ENVELOPE AND SLOPE ON PERFORMANCE OF A DRAINAGE-SUBIRRIGATION SYSTEM.
Marjorie S. Davenport, R.W. Skaggs
1986, Conference Paper, Paper - American Society of Agricultural Engineers
A field study was conducted to determine the effect of fabric wrap envelope and drain slope on the performance of a combination drainage and subirrigation system. Data were analyzed by examining relationships between flow rate and midpoint water table elevations. An entry resistance was defined and its value for each...
Organic metamorphism in the Lower Mississippian-Upper Devonian Bakken shales. Part 1: Rock-Eval pyrolysis and vitrinite reflectance
L.C. Price, T. Daws, M. Pawlewicz
1986, Journal of Petroleum Geology (9) 125-162
Detailed organic geochemistry has been performed on a large number of Lower Mississippian-Upper Devonian Bakken shales from the North Dakota portion of the Williston Basin, and 28 oils mainly from Mississippian Madison Group rocks from different basinal areas. Here we report results of Rock-Eval pyrolysis and vitrinite reflectance (Ro) analyses....
Pb, Sr, Nd, and Hf isotopic constraints on the origin of Hawaiian basalts and evidence for a unique mantle source
P. Stille, D.M. Unruh, M. Tatsumoto
1986, Geochimica et Cosmochimica Acta (50) 2303-2319
Pb, Sr, Nd, and Hf isotopic relationships among basalts from the Hawaiian Islands suggest that these basalts were derived from three sources; the oceanic lithosphere (Kea end member), the depleted asthenosphere (posterosional end member) and a deep-mantle plume (Koolau end member).Hawaiian tholeiites are derived within the lithosphere and the isotopic...
Pre-Wisconsin glacial stratigraphy of the central plains region in Iowa, Nebraska, Kansas, and Missouri
G.R. Hallberg
1986, Quaternary Science Reviews (5) 11-15
Recent investigations have documented the presence of several tills and interglacial paleosols that were not recognized in the simple Kansan-Aftonian-Nebraskan stratigraphic sequence. Also, the single 'Pearlette ash' recognized by early workers now is known to be three different Pearlette family ash beds of greatly contrasting ages. The complexity of the...
STRIKE SLIP ON REACTIVATED TRIASSIC(? ) BASIN BOUNDARY FAULT ZONES AS SOURCES OF EARTHQUAKES NEAR CHARLESTON, S. C.
John C. Behrendt, Annette Yuan
1986, Conference Paper
Interpretation of several thousand kilometers of multifold seismic reflection data supports the old theory that earthquakes in the Charleston, S. C. area are associated with reactivated Triassic(? ) basin boundary extensional fault zones. The Gants-Cooke fault zone associated with the Jedburg basin in the 1886 meizoseismal area, an unnamed fault...
LONG-TERM EARTHQUAKE PREPAREDNESS IN CHARLESTON, SOUTH CAROLINA.
P. L. Gori, M.R. Greene
1986, Conference Paper
The Charleston, South Carolina, area offers a unique opportunity to conduct studies that give insight into the implementation of policy for long-term earthquake preparedness at the local level. Research by Greene and Gori documented the low state of preparedness in 1981. Recent studies show that earthquake preparedness activities are now...
A ground-water mixing model for the origin of the Imini manganese deposit (Cretaceous) of Morocco
E. R. Force, W. Back, E.C. Spiker, L.P. Knauth
1986, Economic Geology (81) 65-79
Three beds of manganese oxide ore in a 10 m-thick dolomite unit are associated with diagenetic features, and, are accordingly also diagenetic in their present aspect. Whether primary or introduced, the Mn mineralogy is attributed to reactions between fresh and saline ground-waters as the zone of mixing passed through the...
Phase relations in the CuVS system
D. Wu, L.L.Y. Chang, C.R. Knowles
1986, Journal of the Less-Common Metals (115) 243-251
Phase relations in the system Cu-V-S were studied by using a sealedcapsule technique, reflected-light microscopy, X-ray powder diffraction and electron microprobe analysis. In the temperature range between 300 and 900 ??C, six vanadium sulfides exist in the V-S system. These are VS, V7S8, V3S4, V5S8, V3S5 and VS4. In the...
Image mapping with the Thematic Mapper.
A. P. Colvocoresses
1986, Photogrammetric Engineering and Remote Sensing (52) 1499-1505
This paper deals principally with Landsat Thematic Mapper (TM) image maps as published by the US Geological Survey (USGS). Landsat data have certain characteristics that make them suitable for conversion into image maps. These characteristics involve 1) spatial resolution, 2) geometric fidelity, and 3) spectral response. This paper analyzes the...
Inductively coupled plasma atomic fluorescence spectrometric determination of cadmium, copper, iron, lead, manganese and zinc
R. F. Sanzolone
1986, Journal of Analytical Atomic Spectrometry (1) 343-347
An inductively coupled plasma atomic fluorescence spectrometric method is described for the determination of six elements in a variety of geological materials. Sixteen reference materials are analysed by this technique to demonstrate its use in geochemical exploration. Samples are decomposed with nitric, hydrofluoric and hydrochloric acids, and the residue dissolved...
HOLOCENE AND LATE PLEISTOCENE(? ) EARTHQUAKE-INDUCED SAND BLOWS IN COASTAL SOUTH CAROLINA.
S. F. Obermeier, R. B. Jacobson, D.S. Powars, R.E. Weems, D.C. Hallbick, G. S. Gohn, H. W. Markewich
1986, Conference Paper
Multiple generations of prehistoric sand blows, interpreted as earthquake induced, have been discovered throughout coastal South Carolina. These sand blows extend far beyond 1886 earthquake induced sand blows, in sediments having approximately the same liquefaction susceptibility. The seismic source zone for the prehistoric sand blows is unknown. The different distributions...
Akermanite: phase transitions in heat capacity and thermal expansion, and revised thermodynamic data.
B. S. Hemingway, H. T. Evans Jr., Gordon L. Nord Jr., H.T. Haselton Jr., R. A. Robie, J. J. McGee
1986, Canadian Mineralogist (24) 425-434
A small but sharp anomaly in the heat capacity of akermanite at 357.9 K, and a discontinuity in its thermal expansion at 693 K, as determined by XRD, have been found. The enthalpy and entropy assigned to the heat-capacity anomaly, for the purpose of tabulation, are 679 J/mol and 1.9...
Upper mantle structure from teleseismic P wave arrivals in Washington and northern Oregon
C. A. Michaelson, C.S. Weaver
1986, Journal of Geophysical Research Solid Earth (91) 2077-2094
Teleseismic P wave travel time residuals are used to detect lateral velocity heterogeneities in the upper mantle beneath Washington and northern Oregon. The results of an inversion for three-dimensional velocity variations resolves an east dipping high-velocity zone that we interpret as the subducting Juan de Fuca plate. The plate is characterized by...