On the interpretation of satellite-derived gravity and magnetic data for studies of crustal geology and metallogenesis
David A. Hastings
1985, Conference Paper, Geopotential Research Mission (GRM): Proceedings of a conference
Satellite-derived global gravity and magnetic maps have been shown to be useful in large-scale studies of the Earth's crust, despite the relative infancy of such studies. Numerous authors have made spatial associations of gravity or magnetic anomalies with geological provinces. Gravimetric interpretations are often made in terms of isostasy, regional...
Periodic autoregressive-moving average (PARMA) modeling with applications to water resources
A. V. Vecchia
1985, Journal of the American Water Resources Association (21) 721-730
Results involving correlation properties and parameter estimation for autoregressive-moving average models with periodic parameters are presented. A multivariate representation of the PARMA model is used to derive parameter space restrictions and difference equations for the periodic autocorrelations. Close approximation to the likelihood function for Gaussian PARMA processes results in efficient...
Detectability of step trends in the rate of atmospheric deposition of sulfate
R.M. Hirsch, E.J. Gilroy
1985, Journal of the American Water Resources Association (21) 773-784
A method is presented to assist policy makers in determining the combination of number of sampling stations and number of years of sampling necessary to state with a given probability that a step reduction in atmospheric deposition rates of a given magnitude has occurred at a pre-specified time. This pre-specified...
Mountain pine beetle damage and contagion modeling: some concepts and approaches
David B. Hamilton, James E. Roelle, William B. White
1985, Report
No abstract available....
Monitoring the earth: too many players?
Gene A. Thorley
1985, Pecora 10 Symposium 457-462
A number of organizations are currently engaged in, or proposing to embark on, worldwide measurement/monitoring programs. Program objectives vary in type and complexity, including a form of technical library (the Global Environment Monitoring System of the United Nations Environment Program), and an ambitious experiment to validate algorithms to derive...
Landsat-faciliated vegetation classification of the Kenai National Wildlife Refuge and adjacent areas, Alaska
Stephen S. Talbot, M.B. Shasby, T.N. Bailey
1985, Conference Paper, Pecora 10 Symposium
A Landsat-based vegetation map was prepared for Kenai National Wildlife Refuge and adjacent lands, 2 million and 2.5 million acres respectively. The refuge lies within the middle boreal sub zone of south central Alaska. Seven major classes and sixteen subclasses were recognized: forest (closed needleleaf, needleleaf woodland, mixed);...
Dynamics of a black-capped chickadee population, 1958-1983
G. Loery, James D. Nichols
1985, Ecology (66) 1195-1203
The dynamics of a wintering population of Black—capped Chickadees (Parus atricapillus) were studied from 1958—1983 using capture—recapture methods. The Jolly—Seber model was used to obtain annual estimates of population size, survival rate, and recruitment. The average estimated population size over this period was °160 birds. The average estimated number of...
Biogeochemistry of aquatic humic substances in Thoreau's Bog, Concord, Massachusetts
Diane M. McKnight, E. Michael Thurman, Robert L. Wershaw, Herold Hemond
1985, Ecology (66)-1339
Thoreau's Bog is an ombrotrophic floating—mat Sphagnum bog developed in a glacial kettlehole and surrounded by a red maple swamp. Concentrations of dissolved organic carbon in the porewater of the bog average 36 mg/L and are greatest near the surface, especially during late summer. This distribution suggest that the upper...
Application of a ground-water flow digital model in evaluating alternate dewatering systems in the Río Grande de Arecibo alluvial valley, Puerto Rico
Vicente Quinones-Aponte, Heriberto Torres-Sierra
1985, Conference Paper, American Water Resources Association, Technical Publication Series TPS-85-1
Rate and depth of pedogenic-carbonate accumulation in soils: Formation and testing of a compartment model.
Leslie D. McFadden, John Tinsley
1985, GSA Special Papers (203) 23-41
The rate and depth of pedogenic carbonate accumulation in soils formed in Quaternary alluvium may be viewed as a theoretical problem that involves the mutual interaction of several independent and dependent soil-forming variables. We propose a model for carbonate accumulation in which the soil column is defined by a vertical...
Effects of fluoride on screech owl reproduction: Teratological evaluation, growth, and blood chemistry in hatchlings
D. J. Hoffman, O. H. Pattee, Stanley N. Wiemeyer
1985, Toxicology Letters (26) 19-24
The effects on reproduction in screech owls (Otus asio) of chronic dietary sodium fluoride administration at 0, 40, and 200 ppm were examined. Fluoride at 40 ppm resulted in a significantly smaller egg volume, while 200 ppm also resulted in lower egg weights and lengths. Day-one hatchlings in the 200...
Inversion of seismic refraction data in planar dipping structure
Bernd Milkereit, Walter D. Mooney, W.M. Kohler
1985, Geophysical Journal International (82) 81-103
A new method is presented for the direct inversion of seismic refraction data in dipping planar structure. Three recording geometries, each consisting of two common-shot profiles, are considered: reversed, split, and roll-along profiles. Inversion is achieved via slant stacking the common-shot wavefield to obtain a delay time—slowness (tau—p) wavefield....
Use of Peltier coolers as soil heat flux transducers
H. L. Weaver, G. S. Campbell
1985, Soil Science Society of America Journal (49) 1065-1067
Peltier coolers were modified and calibrated to serve as soil heat flux transducers. The modification was to fill their interiors with epoxy. The average calibration constant on 21 units was 13.6 ± 0.8 kW m−2 V−1 at 20°C. This sensitivity is about eight times that of the two thermopile transducers with which...
The occurrence of extractable elements in soils from the northern Great Plains
J.M. McNeal, R. C. Severson, Larry P. Gough
1985, Soil Science Society of America Journal (49) 873-881
The modes of occurrence of extractable elements from 21 A and C horizon samples of uncultivated soils were examined using R-mode factor analysis. The extractants (DTPA, EDTA, HCl, hydroquinone, magnesium nitrate, and ammonium oxalate) cover a wide range of chemical attack. Four major elements (Ca, K, Mg, and Na) and...
The water resources models of the instream flow group
Robert T. Milhous
1985, Book, Computer applications in water resources: Proceedings of the specialty conference sponsored by the resources planning and management division
No abstract available....
Foraging decisions, patch use, and seasonality in egrets (Aves: ciconiiformes)
R. Michael Erwin
1985, Ecology (66) 837-844
Feeding Snowy (Egretta thula) and Great (Casmerodius albus) egrets were observed during two breeding seasons in coastal New Jersey and two brief winter periods in northeast Florida. A number of tests based on assumptions of foraging models, predictions from foraging theory, and earlier empirical tests concerning time allocation and movement...
Water quality and chemical evolution of ground water within the north coast limestone aquifers of Puerto Rico
Angel J. Roman-Mas, Roger W. Lee
1985, Conference Paper, American Water Resources Association, Technical Publication Series TPS-85-1
Waters within the north coastal limestoneaquifers are suitable for public supply, industrial and agricultural uses. For the artesian aquifer and the updip parts of the watertable aquifer, calcium and bicarbonate are the dominant ionic species with total dissolved solids and chloride concentrations below 500 and 250 mg/L, respectively. In coastal areas of...
A model for a seismic computerized alert network
Thomas H. Heaton
1985, Science (228) 987-990
In large earthquakes, damaging ground motions may occur at large epicentral distances. Because of the relatively slow speed of seismic waves, it is possible to construct a system to provide short-term warning (as much as several tens of seconds) of imminent strong ground motions from major earthquakes. Automated safety responses...
The relocation of microearthquakes in the northern Mississippi Embayment
M.C. Andrews, Walter D. Mooney, R.P. Meyer
1985, Journal of Geophysical Research Solid Earth (90) 10223-10236
Three-component seismograms, recorded by a small array of digital instruments in the northern Mississippi embayment, consistently show a high-amplitude phase on the vertical component that arrives approximately 0.8 s before the shear wave. On the basis of its timing and apparent velocity, this phase is identified as an S-P conversion from the...
Mineralogy and geochemistry of a sediment‐hosted hydrothermal sulfide deposit from the Southern Trough of Guaymas Basin, Gulf of California
Randolph A. Koski, P. F. Lonsdale, Wayne C Shanks, M.E. Berndt, S. S. Howe
1985, Journal of Geophysical Research B: Solid Earth (90) 6695-6707
Samples dredged from a 15‐m‐high hydrothermal mound atop the flat turbidite pond in the Southern Trough of Guaymas Basin consist of pyrrhotite‐rich massive sulfide, barite, barite + calcite, talc, and opaline silica as well as substrate material composed of fossiliferous, clay‐rich ooze. An 11‐m‐long sediment core taken near the dredge...
Fluorine in Colorado oil shale
John R. Dyni
1985, Conference Paper, Eighteenth Oil Shale symposium
Oil shale from the lower part of the Eocene Green River Formation in the Piceance Creek Basin, Colorado, averages 0.13 weight percent fluorine, which is about twice that found in common shales, but is the same as the average amount found in some oil shales from other parts of the...
A new isostatic residual gravity map of the conterminous United States
Robert W. Simpson, Robert C. Jachens, Richard W. Saltus, Richard J. Blakely
1985, Conference Paper
In order to display more clearly the gravity anomalies caused by bodies of geologic interest in the crust, a new colored isostatic residual gravity map of the conterminous United States has been prepared using the gravity data set compiled for the Gravity Anomaly Map of the United States (SEG, 1982)....
Population dynamics of Yellowstone grizzly bears
Richard R. Knight, L.L. Eberhardt
1985, Ecology (66) 323-334
Data on the population of grizzly bears in the environs of Yellowstone National Park suggest that the population has not recovered from the reductions following closure of garbage dumps in 1970 and 1971, and may continue to decline. A computer simulation model indicates that the risk of extirpation over the...
Density-production characteristics of box-nesting wood ducks in a northern greentree impoundment
G.M. Haramis, D.Q. Thompson
1985, Journal of Wildlife Management (49) 429-436
Nesting wood ducks (Aix sponsa) were studied for 7 years (1973-79) following placement of nest boxes within a 250-ha experimental greentree impoundment located at the Montezuma National Wildlife Refuge in central New York. Wood ducks filled available nesting space in the 3rd year of the study. As nesting space became...
Storm-induced response of a nearshore-bar system
Asbury H Sallenger Jr., Robert A. Holman, W.A. Birkemeier
1985, Marine Geology (64) 237-257
A nearshore-bar system was surveyed periodically through a storm and the following recovery period. The data showed a very rapid response of morphology to changing wave conditions and allowed various models on bar formation to be tested.Under low-energy conditions prior to the storm a small bar was surveyed 13 m...
