Pre-exploitation state of the Ahuachapán geothermal field, El Salvador
Z. Aunzo, C. Laky, B. Steingrimsson, G.S. Bodvarsson, M.J. Lippmann, A.H. Truesdell, C. Escobar, A. Quintanilla, G. Cuellar
1991, Geothermics (20) 1-22
The lithology and structural features of the Ahuachapán geothermal area and their impact on the movement of cold and hot fluids within the system are described, as well as the development and evaluation of the natural state model of the field. Four major lithologic units are present in Ahuachapán and...
Biological response of Thrush Lake, Minnesota, to a protective liming treatment
D. Wright, M. Danks, W. Popp, P. Eiler, R.K. Schreiber
H. Olem, R.K. Schreiber, R.W. Brocksen, D.B. Porcella, editor(s)
1991, Book chapter, International Lake and Watershed Liming Practices
No abstract available at this time...
Convergent radial dispersion: A note on evaluation of the Laplace transform solution
Allen F. Moench
1991, Water Resources Research (27) 3261-3264
A numerical inversion algorithm for Laplace transforms that is capable of handling rapid changes in the computed function is applied to the Laplace transform solution to the problem of convergent radial dispersion in a homogeneous aquifer. Prior attempts by the author to invert this solution were unsuccessful for highly advective...
Small Mammal Detailed Procedure
P.A. Medica, M.B. Saethre
1991, Detailed procedure AABAF.06.00 Rev. 1
No abstract available at this time...
Water Resources Data, New Hampshire and Vermont, Water Year 1990
K. W. Toppin, K.E. McKenna, J. E. Cotton, J.C. Denner
1991, Water Data Report NH-VT-90-1
No abstract available. ...
Lizard Study Procedures
P.A. Medica
1991, Detailed procedure AABAF.D.05.00 Rev. 1
No abstract available at this time...
Crisis in chemical and drug registration
R. A. Schnick
1991, Fisheries (16) 3-3
No abstract available....
Tortoise Detailed Procedure
P.A. Medica
1991, Detailed procedure AABAF.D.04.00 Rev. 1
No abstract available at this time...
Enzymatic versus nonenzymatic mechanisms for Fe(III) reduction in aquatic sediments
Derek R. Lovley, Elizabeth J.P. Phillips, D.J. Lonergan
1991, Environmental Science & Technology (25) 1062-1067
No abstract available....
Performance of the goulden large-sample extractor in multiclass pesticide isolation and preconcentration from stream water
G.D. Foster, W.T. Foreman, Paul M. Gates
1991, Journal of Agricultural and Food Chemistry (39) 1618-1622
The reliability of the Goulden large-sample extractor in preconcentrating pesticides from water was evaluated from the recoveries of 35 pesticides amended to filtered stream waters. Recoveries greater than 90% were observed for many of the pesticides in each major chemical class, but recoveries for some of the individual pesticides varied...
Distribution of rubidium, strontium, and zirconium in tuff from two deep coreholes at Yucca Mountain, Nevada
Richard W. Spengler, Zell E. Peterman
Anon, editor(s)
1991, Conference Paper, High Level Radioactive Waste Management
Variations in concentrations of trace elements Rb, Sr, and Zr within the sequence of high-silica tuff and dacitic lava beneath Yucca Mountain reflect both primary composition and secondary alteration. Rb and K concentrations have parallel trends. Rb concentrations are significantly lower within intervals containing zeolitic nonwelded to partially welded and...
Capture myopathy in an endangered sandhill crane (Grus canadensis pulla)
J. W. Carpenter, Nancy Thomas, S. Reeves
1991, Journal of Zoo and Wildlife Medicine (22) 488-493
Despite precautions to protect cranes, a 3-year-old endangered Mississippi sandhill crane (Grus canadensis pulla) was found caught in a leghold trap in Gautier, Mississippi, on 11 November 1987. The bird could have been in the trap for up to 16 hr and was standing and struggling to escape when it...
Use of colloid filtration theory in modeling movement of bacteria through a contaminated sandy aquifer
R.W. Harvey, S. P. Garabedian
1991, Environmental Science & Technology (25) 178-185
\A filtration model commonly used to describe removal of colloids during packed-bed filtration in water treatment applications was modified for describing downgradient transport of bacteria in sandy, aquifer sediments. The modified model was applied to the results of a small-scale (7 m), natural-gradient tracer test and to observations of an...
Crustal subsidence, seismicity, and structure near Medicine Lake Volcano, California
D. Dzurisin, J.M. Donnelly-Nolan, J.R. Evans, S.R. Walter
1991, Journal of Geophysical Research (96)
The pattern of historical ground deformation, seismicity, and crustal structure near Medicine Lake volcano illustrates a close relation between magmatism and tectonism near the margin of the Cascade volcanic chain and the Basin and Range tectonic province. Between leveling surveys in 1954 and 1989 the...
Geophysical borehole logging in the unsaturated zone, Yucca Mountain, Nevada
Ulrich Schimschal, Philip H. Nelson
Anon, editor(s)
1991, Conference Paper, High Level Radioactive Waste Management
Borehole geophysical logging for site characterization in the volcanic rocks at the proposed nuclear waste repository at Yucca Mountain, Nevada, requires data collection under rather unusual conditions. Logging tools must operate in rugose, dry holes above the water table in the unsaturated zone. Not all logging tools will operate in...
Circum-Pacific seismic potential: 1989-1999
S.P. Nishenko
1991, Pure and Applied Geophysics PAGEOPH (135) 169-259
The seismic potential for 96 segments of simple plate boundaries around the circum-Pacific region is presented in terms of the conditional probability for the occurrence of either large or great interplate earthquakes during the next 5, 10, and 20 years (i.e., 1989-1994, 1989-1999 and 1989-2009). This study represents the first...
ReOs isotope systematics of NiCu sulfide ores, Sudbury Igneous Complex, Ontario: Evidence for a major crustal component
R.J. Walker, J. W. Morgan, A.J. Naldrett, C. Li, J.D. Fassett
1991, Earth and Planetary Science Letters (105) 416-429
Sudbury Igneous Complex sublayer ores from the Levack West, Falconbridge and Strathcona mines were analyzed for their Re and Os concentrations and Os isotopic compositions. The Re-Os isotope systematics of three ores from the different mines give isochron ages of1 840...
Effects of uranium mining, Puerco River, New Mexico
Thomas J. Lopes
1991, Conference Paper
Effluent from uranium-mine dewatering and acidic water released by a tailings-pond dike failure increased radionuclide activities in streamflow in the Puerco River in New Mexico and Arizona. Median dissolved gross-alpha activity in the streamflow was 1,130 picocuries per liter from 1975 to 1986 when mine discharges ceased and 6.2 picocuries...
Mortality in tundra swans Cygnus columbianus
James C. Bartonek, J.R. Serie, K. A. Converse
1991, Wildfowl (42) 356-358
Our paper identifies and examines the significance of hunting and non-hunting mortality affecting the Eastern Population (EP) and Western Population (WP) (see Serie & Bartonek 1991a) of Tundra Swans. Sport hunting (Serie & Bartonek 1991b), native subsistence hunting (Copp 1989, Stewart & Bernier 1989), malicious shooting (McKelvey & MacNeill 1981),...
Surgical removal of a tracheal foreign body from a whooping crane (Grus americana)
P.E. Howard, F. J. Dein, J.A. Langenberg, K.J. Frischmeyer, D. Brunson
1991, Journal of Zoo and Wildlife Medicine (22) 359-363
The left wing of a whooping crane (Grus americana) was amputated for treatment of severe nonunion and malunion fractures of the radius and ulna. During the postoperative convalescent period, the bird aspirated a corn kernel and subsequently suffered episodic bouts of dyspnea. The bird was anesthetized with tiletamine-zolazepam. Attempts to...
Application of an iterative least-squares waveform inversion of strong-motion and teleseismic records to the 1978 Tabas, Iran, earthquake
S. Hartzell, C. Mendoza
1991, Bulletin of the Seismological Society of America (81) 305-331
An iterative least-squares technique is used to simultaneously invert the strong-motion records and teleseismic P waveforms for the 1978 Tabas, Iran, earthquake to deduce the rupture history. The effects of using different data sets and different parametrizations of the problem (linear versus nonlinear) are considered. A consensus of all the...
Application of ground-penetrating-radar methods in hydrogeologic studies
Milan Beres Jr., F.P. Haeni
1991, Ground Water (29) 375-386
A ground-penetrating-radar system was used to study selected stratified-drift deposits in Connecticut. Ground-penetrating radar is a surface-geophysical method that depends on the emission, transmission, reflection, and reception of an electromagnetic pulse and can produce continuous high-resolution profiles of the subsurface rapidly and efficiently. Traverse locations on land included a well...
Proposed U.S. Geological Survey standard for digital orthophotos
David Hooper, Vincent Caruso
1991, Conference Paper, GIS/LIS 1991 ACSM-ASPRS Fall Convention
The U.S. Geological Survey has added the new category of digital orthophotos to the National Digital Cartographic Data Base. This differentially rectified digital image product enables users to take advantage of the properties of current photoimagery as a source of geographic information. The product and accompanying standard were implemented in...
Analysis of glacier facies using satellite techniques
R.S. Williams Jr., D.K. Hall, C.S. Benson
1991, Journal of Glaciology (37) 120-128
The different snow and ice types on a glacier may be subdivided according to the glacier-facies concept. The surficial expression of some facies may be detected at the end of the balance year by the use of visible and near-infrared image data from the Landsat multispectral scanner...
The effect of sample hydration on 13C CPMAS NMR spectra of fulvic acids
Patrick G. Hatcher, Michael A. Wilson
1991, Organic Geochemistry (17) 293-299
Three fulvic acids, two of which have been well studied by a number of other groups (Armadale and Suwannee river fulvic acids) have been examined by high resolution solid-state 13C-NMR techniques to delineate the effect of absorbed water. Two main effects of absorbed water were observed: (1) changes in spin lattice...
