Imaging the crustal magma sources beneath Mauna Loa and Kilauea volcanoes, Hawaii
Paul G. Okubo, Harley M. Benz, Bernard A. Chouet
1997, Geology (25) 867-870
Three-dimensional seismic P-wave traveltime tomography is used to image the magma sources beneath Mauna Loa and Kilauea volcanoes, Hawaii. High-velocity bodies (>6.4 km/s) in the upper 9 km of the crust beneath the summits and rift zones of the volcanoes correlate with zones of high magnetic intensities and are interpreted...
New harmony: The great scientific experiment
D. C. Haney, D.L. Rice
1997, Geotimes (42) 23-27
[No abstract available]...
Nutrient concentrations in wastewater treatment plant effluents, South Platte River Basin
M. Pocernich, D. W. Litke
1997, Journal of the American Water Resources Association (33) 205-216
ABSTRACT: Accurate data about nutrient concentrations in wastewater treatment plant effluents are needed for river basin water-quality studies. As part of the U.S. Geological Survey's National Water-Quality Assessment Program in the South Platte River Basin, nutrient data were requested from 31 wastewater-treatment plants located in the basin. This article describes the...
Pesticides in the San Joaquin River, California: Inputs from dormant sprayed orchards
Joseph L. Domagalski, N. M. Dubrovsky, C.R. Kratzer
1997, Journal of Environmental Quality (26) 454-465
Rainfall-induced runoff mobilized pesticides to the San Joaquin River and its tributaries during a 3.8-cm rainstorm beginning the evening of 7 February and lasting through the morning of 8 Feb. 1993. Two distinct peaks of organophosphate pesticide concentrations were measured at the mouth of the San...
Evidence for Milankovitch periodicities in Cenomanian-Turonian lithologic and geochemical cycles, western interior U.S.A.
B.B. Sageman, J. Rich, M.A. Arthur, G.E. Birchfield, W.E. Dean
1997, Journal of Sedimentary Research (67) 286-302
The limestone/marlstone bedding couplets of the Bridge Creek Limestone Member, Cenomanian-Turonian Greenhorn Formation, were analyzed by applying spectral techniques to high-resolution lithologic and geochemical data from a core. The results suggest that the Bridge Creek contains a complex record of orbital cyclicity. The...
Spatial heterogeneity of mercury bioaccumulation by walleye in Franklin D. Roosevelt Lake and the upper Columbia River, Washington
M.D. Munn, T.M. Short
1997, Transactions of the American Fisheries Society (126) 477-487
We examined mercury concentration in muscle of walleye Stizostedion vitreum from three reaches in Franklin D. Roosevelt Lake, a reservoir on the Columbia River, and from the upper Columbia River, an area contaminated by wastes from metal mining and associated processing activities. Our objectives were to describe the relation between size and...
Distribution and stability of eelgrass beds at Izembek Lagoon, Alaska
David H. Ward, Carl J. Markon, David C. Douglas
1997, Aquatic Botany (58) 229-240
Spatial change in eelgrass meadows, Zostera marina L., was assessed between 1978 and 1987 and between 1987 and 1995 at Izembek Lagoon, Alaska. Change in total extent was evaluated through a map to map comparison of data interpreted from a 1978 Landsat multi-spectral scanner image and 1987 black and white...
Morphology and distribution of seamounts surrounding Easter Island
Y. Rappaport, D. F. Naar, C.C. Barton, Z.-J. Liu, R.N. Hey
1997, Journal of Geophysical Research B: Solid Earth (102) 24713-24728
We investigate the morphology and distribution of a seamount population on a section of seafloor influenced by both superfast seafloor spreading and hotspot volcanism. The population under investigation is part of a broad chain of seamounts extending eastward from the East Pacific Rise, near Easter Island. In order to define...
The chemical evolution and paragenesis of uranium minerals from the ruggles and palermo granitic pegmatites, New Hampshire
S.L. Korzeb, E.E. Foord, F.E. Lichte
1997, Canadian Mineralogist (35) 135-144
A study of the chemical evolution and paragenesis of the uranium minerals at the Palermo No. 1 and Ruggles granitic pegmatites, Grafton County, New Hampshire, revealed four stages of secondary mineralization. A total of eight uranium minerals were identified in the four stages. The first stage is a mixture of...
The International Geosphere Biosphere Programme Data and Information System global land cover data set (DISCover)
Thomas R. Loveland, A.S. Belward
1997, Acta Astronautica (41) 681-689
The International Geosphere Biosphere Programme Data and Information System (IGBP-DIS), through the mapping expertise of the U.S. Geological Survey and the European Commission's Joint Research Centre, recently guided the completion of a 1-km resolution global land cover data set from advanced very high resolution radiometer (AVHRR) data. The 1-km resolution...
Rates, timing, and cyclicity of Holocene eolian activity in north-central United States: Evidence from varved lake sediments
W.E. Dean
1997, Geology (25) 331-334
Most of the sediment components that accumulated in Elk Lake, northwestern Minnesota, during the Holocene are autochthonous or biogenic, delivered to the sediment-water interface on a seasonal schedule, preserved in distinct annual laminae (varves). The main allochthonous component is detrital clastic material, as...
Linkage between mantle and crustal structures and its bearing on inherited structures in northwestern Scotland
D.B. Snyder, R.W. England, J.H. McBride
1997, Journal of the Geological Society (154) 79-83
Deep seismic reflection profiles in Scotland reveal mantle structures beneath a crust with a polyphase tectonic history that resulted in several generations of structures. Continuum mechanics suggests that coeval mantle and crustal structures must be kinematically linked. Inherited structures imply relative ages for the reflectors, ages that can be placed...
Fossil zooplankton and the historical status of westslope cutthroat trout in a headwater lake of Glacier National Park, Montana
D. Verschuren, L.F. Marnell
1997, Transactions of the American Fisheries Society (126) 21-34
Surviving pure-strain populations of westslope cutthroat trout Oncorhynchus clarki lewisi in headwater lakes of Glacier National Park could play an important role in the managed recovery of regional cutthroat trout fisheries. However, uncertainty exists about whether native trout could have naturally invaded several park lakes where they now occur. This...
Rapid and widespread dispersal of flood sediment on the northern California margin
R. A. Wheatcroft, C.K. Sommerfield, D.E. Drake, J. C. Borgeld, C.A. Nittrouer
1997, Geology (25) 163-166
The dispersal of flood sediment from small river systems is a poorly studied, yet potentially important aspect of active continental-margin sedimentation. In January 1995, during a flood with a 30 yr return period, the Eel River (northern California) delivered an estimated 25 ±...
Fault-related folding during extension: Plunging basement-cored folds in the Basin and Range
K. A. Howard, Barbara E. John
1997, Geology (25) 223-226
Folds are able to form in highly extended areas where stratified cover rocks respond to basement fault offsets. The response of cover rocks to basement faulting can be studied especially well in plunging structures that expose large structural relief. The southern Basin and...
Geochemical mole-balance modeling with uncertain data
David L. Parkhurst
1997, Water Resources Research (33) 1957-1970
Geochemical mole-balance models are sets of chemical reactions that quantitatively account for changes in the chemical and isotopic composition of water along a flow path. A revised mole-balance formulation that includes an uncertainty term for each chemical and isotopic datum is derived. The revised formulation is comprised of mole-balance equations...
Duration and structure of the past four interglaciations
I.J. Winograd, J.M. Landwehr, K.R. Ludwig, T.B. Coplen, A.C. Riggs
1997, Quaternary Research (48) 141-154
Reanalysis and additional dating of the Devils Hole ??18O paleotemperature record confirm that the last interglaciation in the Great Basin (the continental analog of marine isotopic substage 5e) lasted ???22,000 yr, consistent with the Vostok paleotemperature record which suggests a duration of ???19,000 yr for this event in Antarctica. The...
Population structure and the evolution of sexual size dimorphism and sex ratios in an insular population of Florida box turtles (Terrapene carolina bauri)
C.K. Dodd Jr.
1997, Canadian Journal of Zoology (75) 1495-1507
Hypotheses in the chelonian literature suggest that in species with sexual size dimorphism, the smaller sex will mature at a smaller size and a younger age than the larger sex, sex ratios should be biased in favor of the earlier maturing sex, and deviations from a 1:1 sex ratio result...
Strategies for management of furunculosis Atlantic salmon effected by non-lethal detection of Aeromonas salmonicida: a review
R. C. Cipriano
1997, Bulletin of the European Association of Fish Pathologists (17) 215-219
A night-lighting technique for at-sea capture of Xantus' Murrelets
Darrell L. Whitworth, John Y. Takekawa, Harry R. Carter, W.R. McIver
1997, Colonial Waterbirds (20) 525-531
We captured 575 Xantus' Murrelets (Synthliboramphus hypoleucus) with spotlights and dip nets at 3 islands in the Southern California Channel Islands during April and May of 1995-1997. Working at night (2100-0500 h), 3-person teams in inflatable boats located murrelets with a spotlight and captured them in dip nets from the...
A reconnaissance study of oxygen, hydrogen and strontium isotopes in geochemically diverse lakes, Western Nebraska, USA
D.C. Gosselin, P.E. Nabelek, Z. E. Peterman, S. Sibray
1997, Journal of Paleolimnology (17) 51-65
Reconnaissance ??18O,, ??D, and ??87Sr data for fifteen lakes in the Western Lakes Region of the Sand Hills of Nebraska indicate dynamic hydrologic systems. The rather narrow range of ??87Sr from lake water (1.1 to 2.1) and groundwater (0.9 to 1.7) indicates that the groundwater is generally unradiogenic. Groundwater residence...
Geology, thermal maturation, and source rock geochemistry in a volcanic covered basin: San Juan sag, south-central Colorado
R. R. Gries, J.L. Clayton, C. Leonard
1997, American Association of Petroleum Geologists Bulletin (81) 1133-1160
The San Juan sag, concealed by the vast San Juan volcanic field of south-central Colorado, has only recently benefited from oil and gas wildcat drilling and evaluations. Sound geochemical analyses and maturation modeling are essential elements for successful exploration and development. Oil has been produced in minor quantities from an...
Modeling gas transfer in a spray tower oxygen absorber
Brian J. Vinci, Barnaby J. Watten, Michael Timmons
1997, Aquacultural Engineering (16) 91-105
A computer model characterizing the performance of a spray tower oxygen absorption system was developed based on finite difference mass transfer calculations. Performance was assessed in terms of oxygen utilization, transfer efficiency, and economy. Pilot scale tests verified model assumptions and performance predictions. Simulation runs indicated spray tower head and...
Crustal structure, evolution, and volcanic unrest of the Alban Hills, Central Italy
C. Chiarabba, A. Amato, P.T. Delaney
1997, Bulletin of Volcanology (59) 161-170
The Alban Hills, a Quaternary volcanic center lying west of the central Apennines, 15-25 km southeast of Rome, last erupted 19ka and has produced approximately 290 km3 of eruptive deposits since the inception of volcanism at 580 ka. Earthquakes of moderate intensity have been generated there at least since the...
Occurrence of the gasoline oxygenate MTBE and BTEX compounds in municipal stormwater in the United States, 1991-95
G.C. Delzer, J.S. Zogorski, T. J. Lopes
1997, ACS Division of Environmental Chemistry, Preprints (37) 374-376
The U.S. Geological Survey (USGS) sampled stormwater in 16 cities and metropolitan areas that are required to obtain permits to discharge stormwater from their municipal storm-sewer system into surface water. Concentrations of 62 volatile organic compounds (VOCs), including methyl tert-butyl ether (MTBE) and BTEX (benzene, toluene, ethylbenzene, and total xylene)...
