Volcano monitoring using the Global Positioning System: Filtering strategies
K.M. Larson, Peter Cervelli, M. Lisowski, Asta Mikijus, P. Segall, S. Owen
2001, Journal of Geophysical Research B: Solid Earth (106) 19453-19464
Permanent Global Positioning System (GPS) networks are routinely used for producing improved orbits and monitoring secular tectonic deformation. For these applications, data are transferred to an analysis center each day and routinely processed in 24-hour segments. To use GPS for monitoring volcanic events, which may last only a few hours,...
Negligible risk associated with the movement of processed rainbow trout, Oncorhynchus mykiss (Walbaum), from an infectious haematopoietic necrosis virus (IHNV) endemic area
S. E. LaPatra, W.N. Batts, K. Overturf, G.N. Jones, W. D. Shewmaker, J. R. Winton
2001, Journal of Fish Diseases (24) 399-408
To assess the risk of transmission of infectious haematopoietic necrosis virus (IHNV) associated with the movement of processed rainbow trout, Oncorhynchus mykiss, from an area where the virus is endemic, 240 freshly eviscerated fish (225-500 g) exhibiting spinal curvature or spinal compression types of deformities were tested for IHNV by...
Evidence that coded-wire-tagging procedures can enhance transmission of Renibacterium salmoninarum in chinook salmon
D.G. Elliott, R.J. Pascho
2001, Journal of Aquatic Animal Health (13) 181-193
Binary coded wire tags (CWTs) are used extensively for identification and management of anadromous salmonid populations. A study of bacterial kidney disease (BKD) in two brood year groups of hatchery-reared spring chinook salmon Oncorhynchus tshawytscha provided strong evidence that horizontal transmission of Renibacterium salmoninarum, the causative agent of BKD, might...
Pesticides associated with suspended sediments entering San Francisco Bay following the first major storm of water year 1996
Brian A. Bergamaschi, Kathryn Kuivila, Miranda S. Fram
2001, Estuaries (24) 368-380
Estuaries receive large quantities of suspended sediments following the first major storm of the water year. The first-flush events transport the majority of suspended sediments in any given year, and because of their relative freshness in the hydrologic system, these sediments may carry a significant amount of the sediment-associated pesticide...
Locating earthquakes: At what distance can the Earth no longer be treated as flat?
J.A. Snoke, J.C. Lahr
2001, Seismological Research Letters (72) 538-541
No abstract available....
A metadata initiative for global information discovery
E. Christian
2001, Government Information Quarterly (18) 209-221
The Global Information Locator Service (GILS) encompasses a global vision framed by the fundamental values of open societies. Societal values such as a free flow of information impose certain requirements on the society's information infrastructure. These requirements in turn shape the various laws, policies, standards, and technologies that determine the...
Initial hydrologic and geomorphic response following a wildfire in the Colorado front range
John A. Moody, Deborah A. Martin
2001, Earth Surface Processes and Landforms (26) 1049-1070
A wildfire in May 1996 burned 4690 hectares in two watersheds forested by ponderosa pine and Douglas fir in a steep, mountainous landscape with a summer, convective thunderstorm precipitation regime. The wildfire lowered the erosion threshold in the watersheds, and consequently amplified the subsequent erosional response to shorter time interval...
Calibration of the DRASTIC ground water vulnerability mapping method
M.G. Rupert
2001, Ground Water (39) 625-630
Ground water vulnerability maps developed using the DRASTIC method have been produced in many parts of the world. Comparisons of those maps with actual ground water quality data have shown that the DRASTIC method is typically a poor predictor of ground water contamination. This study significantly improved the effectiveness of...
Effect of scale on the behavior of atrazine in surface waters
P. D. Capel, S.J. Larson
2001, Environmental Science & Technology (35) 648-657
Field runoff is an important transport mechanism by which agricultural pesticides, including atrazine, move into the hydrologic environment. Atrazine is chosen because it is widely used, is transported in runoff relatively easily, is widely observed in surface waters, and has relatively little loss in the stream network. Data on runoff...
The dependence of acoustic properties of a crack on the resonance mode and geometry
Hiroyuki Kumagai, B. A. Chouet
2001, Geophysical Research Letters (28) 3325-3328
We examine the dependence of the acoustic properties of a crack containing magmatic or hydrothermal fluids on the resonance mode and geometry to quantify the source properties of long-period (LP) events observed in volcanic areas. Our results, based on spectral analyses of synthetic waveforms generated with a fluid-driven crack model,...
Transport and fate of organic wastes in groundwater at the Stringfellow hazardous waste disposal site, southern California
J.A. Leenheer, J. Hsu, L. B. Barber
2001, Journal of Contaminant Hydrology (51) 163-178
In January 1999, wastewater influent and effluent from the pretreatment plant at the Stringfellow hazardous waste disposal site were sampled along with groundwater at six locations along the groundwater contaminant plume. The objectives of this sampling and study were to identify at the compound class level the unidentified 40–60% of wastewater organic contaminants, and to determine...
Estimating repeatability of egg size
Paul L. Flint, R.F. Rockwell, J.S. Sedinger
2001, The Auk (118) 500-503
Measures of repeatability have long been used to assess patterns of variation in egg size within and among females. We compared different analytical approaches for estimating repeatability of egg size of Black Brant. Separate estimates of repeatability for eggs of each clutch size and laying sequence number varied from 0.49...
Evaluation of commercially prepared transport systems for nonlethal detection of Aeromonas salmonicida in salmonid fish
R. C. Cipriano, G. L. Bullock
2001, Journal of Aquatic Animal Health (13) 96-104
In vitro studies indicated that commercially prepared transport systems containing Amies, Stuart's, and Cary-Blair media worked equally well in sustaining the viability of the fish pathogen Aeromonas salmonicida, which causes furunculosis. The bacterium remained viable without significant increase or decrease in cell numbers for as long as 48 h of...
Correlation of ground motion and intensity for the 17 January 1994 Northridge, California, earthquake
J. Boatwright, K. Thywissen, L. C. Seekins
2001, Bulletin of the Seismological Society of America (91) 739-752
We analyze the correlations between intensity and a set of groundmotion parameters obtained from 66 free-field stations in Los Angeles County that recorded the 1994 Northridge earthquake. We use the tagging intensities from Thywissen and Boatwright (1998) because these intensities are determined independently on census tracts, rather than interpolated from...
The Ordovician Sebree Trough: An oceanic passage to the Midcontinent United States
Dennis R. Kolata, W.D. Huff, Stig M. Bergstrom
2001, Geological Society of America Bulletin (113) 1067-1078
The Sebree Trough is a relatively narrow, shale-filled sedimentary feature extending for several hundred kilometers across the Middle and Late Ordovician carbonate platform of the Midcontinent United States. The dark graptolitic shales within the trough stand in contrast to the coeval bryozoan-brachiopod-echinoderm– rich limestones on the flanking platforms. We infer...
Interparticle collision of natural sediment grains in water
Mark W. Schmeeckle, Jonathan M. Nelson, John Pitlick, James P. Bennett
2001, Water Resources Research (37) 2377-2391
Elastohydrodynamic theory and measurements of particle impacts on an inclined glass plane in water are used to investigate the mechanics of interparticle collisions in sediment‐transporting flows. A collision Stokes number is proposed as a measure of the momentum of an interparticle collision versus the viscous pressure force in the interstitial...
Application of a nonlinear slug test model
C.D. McElwee
2001, Ground Water (39) 737-744
Knowledge of the hydraulic conductivity distribution is of utmost importance in understanding the dynamics of an aquifer and in planning the consequences of any action taken upon that aquifer. Slug tests have been used extensively to measure hydraulic conductivity in the last 50 years since Hvorslev's (1951) work. A general...
Palynologically calibrated vertebrate record from North Dakota consistent with abrupt dinosaur extinction at the Cretaceous-Tertiary boundary
D.A. Pearson, T. Schaefer, K.R. Johnson, D. J. Nichols
2001, Geology (29) 39-42
New data from 17 Cretaceous-Tertiary (K-T) boundary sections and 53 vertebrate sites in the Hell Creek and Fort Union Formations in southwestern North Dakota document a 1.76 m barren interval between the highest Cretaceous vertebrate fossils and the palynologically recognized K-T boundary. The boundary is above the formational contact at...
Determination of variables in the prediction of strontium distribution coefficients for selected sediments
M.N. Pace, J.J. Rosentreter, R. C. Bartholomay
2001, Environmental Geology (40) 993-1002
Idaho State University and the US Geological Survey, in cooperation with the US Department of Energy, conducted a study to determine and evaluate strontium distribution coefficients (Kds) of subsurface materials at the Idaho National Engineering and Environmental Laboratory (INEEL). The Kds were determined to aid in assessing the variability of...
Drawdown and stream depletion produced by pumping in the vicinity of a partially penetrating stream
J.J. Butler Jr., V.A. Zlotnik, Ming-shu Tsou
2001, Ground Water (39) 651-659
Commonly used analytical approaches for estimation of pumping-induced drawdown and stream depletion are based on a series of idealistic assumptions about the stream-aquifer system. A new solution has been developed for estimation of drawdown and stream depletion under conditions that are more representative of those in natural systems (finite width...
Wavefield properties of a shallow long-period event and tremor at Kilauea Volcano, Hawaii
G. Saccorotti, B. Chouet, P. Dawson
2001, Journal of Volcanology and Geothermal Research (109) 163-189
The wavefields of tremor and a long-period (LP) event associated with the ongoing eruptive activity at Kilauea Volcano, Hawaii, are investigated using a combination of dense small-aperture (300 m) and sparse large-aperture (5 km) arrays deployed in the vicinity of the summit caldera. Measurements of azimuth and slowness for tremor...
Geochemical and mineralogical studies of dinosaur bone from the Morrison Formation at Dinosaur Ridge
P.J. Modreski
2001, Mountain Geologist (38) 111-118
The dinosaur bones first discovered in 1877 in the Upper Jurassic Morrison Formation at Morrison, Colorado were the first major find of dinosaur skeletons in the western U.S. and led to the recognition of four new dinosaur genera (Apatosaurus, Allosaurus, Diplodocus, and Stegosaurus). Eight articles dealing with these bones which...
Translational and fluctuating asymmetry as tools to detect stress in stress-adapted and nonadapted plants
C.L. Alados, T. Navarro, J. Escos, B. Cabezudo, J.M. Emlen
2001, International Journal of Plant Sciences (162) 607-616
Plants having experienced previous exposure to a stress are expected to be more resistant to further stress than those not having been exposed. While the assessment of stress in plants is a difficult task, particularly for stress-adapted plants, developmental instability has proven a useful tool for assessing stress in organisms....
Density model of the Cascadia subduction zone
T.V. Romanyuk, Walter D. Mooney, R.J. Blakely
2001, Izvestiya, Physics of the Solid Earth (37) 617-635
The main goal of this work is to construct self-consistent density models along two profiles crossing the northern and central Cascadia subduction zone that have been comprehensively studied on the basis of geological, geophysical, etc. data....
Elevated carbon dioxide flux at the Dixie Valley geothermal field, Nevada; relations between surface phenomena and the geothermal reservoir
D. Bergfeld, F. Goff, C. J. Janik
2001, Chemical Geology (177) 43-66
In the later part of the 1990s, a large die-off of desert shrubs occurred over an approximately 1 km2 area in the northwestern section of the Dixie Valley (DV) geothermal field. This paper reports results from accumulation-chamber measurements of soil CO2 flux from locations in the dead zone and stable...
