Slip on the San Andreas fault at Parkfield, California, over two earthquake cycles, and the implications for seismic hazard
J. Murray, J. Langbein
2006, Bulletin of the Seismological Society of America (96)
Parkfield, California, which experienced M 6.0 earthquakes in 1934, 1966, and 2004, is one of the few locales for which geodetic observations span multiple earthquake cycles. We undertake a comprehensive study of deformation over the most recent earthquake cycle and explore the results in the context of geodetic data collected...
Juvenile salmonid use of freshwater emergent wetlands in the floodplain and its implications for conservation management
Julie A. Henning, Robert E. Gresswell, Ian A. Fleming
2006, North American Journal of Fisheries Management (26) 367-376
A recent trend of enhancing freshwater emergent wetlands for waterfowl and other wildlife has raised concern about the effects of such measures on juvenile salmonids. We undertook this study to quantify the degree and extent of juvenile Pacific salmon Oncorhynchus spp. utilization of enhanced and unenhanced emergent wetlands within the...
Enabling scientific workflows in virtual reality
O. Kreylos, G. Bawden, T. Bernardin, M.I. Billen, E.S. Cowgill, R.D. Gold, B. Hamann, M. Jadamec, L.H. Kellogg, O.G. Staadt, D.Y. Sumner
2006, Conference Paper, Proceedings - VRCIA 2006ACM International Conference on Virtual Reality Continuum and its Applications
To advance research and improve the scientific return on data collection and interpretation efforts in the geosciences, we have developed methods of interactive visualization, with a special focus on immersive virtual reality (VR) environments. Earth sciences employ a strongly visual approach to the measurement and analysis of geologic data due...
Evaluating minerals of environmental concern using spectroscopy
G.A. Swayze, R. N. Clark, C.T. Higgins, R.F. Kokaly, K. Eric Livo, T.M. Hoefen, C. Ong, F.A. Kruse
2006, Conference Paper, International Geoscience and Remote Sensing Symposium (IGARSS)
Imaging spectroscopy has been successfully used to aid researchers in characterizing potential environmental impacts posed by acid-rock drainage, ore-processing dust on mangroves, and asbestos in serpentine mineral deposits and urban dust. Many of these applications synergistically combine field spectroscopy with remote sensing data, thus allowing more-precise data calibration, spectral analysis...
Body-wave traveltime and amplitude shifts from asymptotic travelling wave coupling
F. Pollitz
2006, Geophysical Journal International (167) 705-736
We explore the sensitivity of finite-frequency body-wave traveltimes and amplitudes to perturbations in 3-D seismic velocity structure relative to a spherically symmetric model. Using the approach of coupled travelling wave theory, we consider the effect of a structural perturbation on an isolated portion of the seismogram. By convolving the spectrum...
Advanced National Siesmic System delivers improved information
S.A. Sipkin, J.R. Filson, H.M. Benz, D.J. Wald, P.S. Earle
2006, Eos, Transactions, American Geophysical Union (87) 365-366
[No abstract available]...
Petroleum Geologist's award to novelist Crichton is inappropriate
J. Brigham-Grete, S. Anderson, J. Clague, J. Cole, P. Doran, A. Gillespie, E. Grimm, P. Guccione, K. Hijghen, S. Jackson, T. Jull, S. Leavitt, R. Mandel, J. Ortiz, D. Rodbell, C. Schweger, A. Smith, B. Styles
2006, Eos, Transactions, American Geophysical Union (87) 364
[No abstract available]...
Evaluation of non-destructive methods for estimating biomass in marshes of the upper Texas, USA coast
M. Whitbeck, J.B. Grace
2006, Wetlands (26) 278-282
The estimation of aboveground biomass is important in the management of natural resources. Direct measurements by clipping, drying, and weighing of herbaceous vegetation are time-consuming and costly. Therefore, non-destructive methods for efficiently and accurately estimating biomass are of interest. We compared two non-destructive methods, visual obstruction and light penetration, for...
A robust design mark-resight abundance estimator allowing heterogeneity in resighting probabilities
B.T. McClintock, Gary C. White, K.P. Burnham
2006, Journal of Agricultural, Biological, and Environmental Statistics (11) 231-248
This article introduces the beta-binomial estimator (BBE), a closed-population abundance mark-resight model combining the favorable qualities of maximum likelihood theory and the allowance of individual heterogeneity in sighting probability (p). The model may be parameterized for a robust sampling design consisting of multiple primary sampling occasions where closure need not...
The effects of river impoundment and hatchery rearing on the migration behavior of juvenile steelhead in the Lower Snake River, Washington
J.M. Plumb, R.W. Perry, N.S. Adams, D.W. Rondorf
2006, North American Journal of Fisheries Management (26) 438-452
We used radiotelemetry to monitor the migration behavior of juvenile hatchery and wild steelhead Oncorhynchus mykiss as they migrated through Lower Granite Reservoir and Dam on the lower Snake River, Washington. From 1996 to 2001, we surgically implanted radio transmitters in 1,540 hatchery steelhead and 1,346 wild steelhead. For analysis,...
Determining anisotropic transmissivity using a simplified Papadopulos method
V.M. Heilweil, P. A. Hsieh
2006, Ground Water (44) 749-753
The straight-line method presented by Papadopulos requires a minimum of three observation wells for determining the transmissivity tensor of a homogeneous and anisotropic aquifer. A simplification of this method was developed for fractured aquifers where the principal directions of the transmissivity tensor are known prior to implementation, such as when...
Effects of hurricanes Katrina and Rita on the chemistry of bottom sediments in Lake Pontchartrain, Louisiana, USA
P. C. Van Metre, A. J. Horowitz, B.J. Mahler, W.T. Foreman, C. C. Fuller, M.R. Burkhardt, K. A. Elrick, E. T. Furlong, S. C. Skrobialowski, J.J. Smith, J.T. Wilson, S.D. Zaugg
2006, Environmental Science & Technology (40) 6894-6902
The effects of Hurricanes Katrina and Rita and the subsequent unwatering of New Orleans, Louisiana, on the sediment chemistry of Lake Pontchartrain were evaluated by chemical analysis of samples of street mud and suspended and bottom sediments. The highest concentrations of urban-related elements and compounds (e.g., Pb,...
Occurrence of organic wastewater compounds in effluent-dominated streams in Northeastern Kansas
C.J. Lee, T. J. Rasmussen
2006, Science of the Total Environment (371) 258-269
Fifty-nine stream-water samples and 14 municipal wastewater treatment facility (WWTF) discharge samples in Johnson County, northeastern Kansas, were analyzed for 55 compounds collectively described as organic wastewater compounds (OWCs). Stream-water samples were collected upstream, in, and downstream from WWTF discharges in urban and rural areas during base-flow conditions. The effect...
Impacts of marsh management on coastal-marsh bird habitats
L.R. Mitchell, S. Gabrey, P.P. Marra, R.M. Erwin
Greenberg R.Maldonado J.E.Droege S.McDonald M.V., editor(s)
2006, Studies in Avian Biology 155-175
The effects of habitat-management practices in coastal marshes have been poorly evaluated. We summarize the extant literature concerning whether these manipulations achieve their goals and the effects of these manipulations on target (i.e., waterfowl and waterfowl food plants) and non-target organisms (particularly coastal-marsh endemics). Although we focus on the effects...
Provenance of north Gondwana Cambrian-Ordovician sandstone: U-Pb SHRIMP dating of detrital zircons from Israel and Jordan
K. Kolodner, D. Avigad, M. McWilliams, J. L. Wooden, T. Weissbrod, S. Feinstein
2006, Geological Magazine (143) 367-391
A vast sequence of quartz-rich sandstone was deposited over North Africa and Arabia during Early Palaeozoic times, in the aftermath of Neoproterozoic Pan-African orogeny and the amalgamation of Gondwana. This rock sequence forms a relatively thin sheet (1-3 km thick) that was transported over a very gentle slope and deposited...
Development of the performance confirmation program at YUCCA mountain, nevada
G.D. LeCain, D. Barr, D. Weaver, R. Snell, S.W. Goodin, F.D. Hansen
2006, Conference Paper, Proceedings of the 11th International High Level Radioactive Waste Management Conference, IHLRWM
The Yucca Mountain Performance Confirmation program consists of tests, monitoring activities, experiments, and analyses to evaluate the adequacy of assumptions, data, and analyses that form the basis of the conceptual and numerical models of flow and transport associated with a proposed radioactive waste repository at Yucca Mountain, Nevada. The Performance...
Trophic transfer of trace metals from the polychaete worm Nereis diversicolor to the polychaete N. virens and the decapod crustacean Palaemonetes varians
P.S. Rainbow, L. Poirier, B. D. Smith, K.V. Brix, S. N. Luoma
2006, Marine Ecology Progress Series (321) 167-181
Diet is an important exposure route for the uptake of trace metals by aquatic invertebrates, with trace metal trophic transfer depending on 2 stages - assimilation and subsequent accumulation by the predator. This study investigated the trophic transfer of trace metals from the sediment-dwelling polychaete worm Nereis diversicolor from metal-rich...
High-resolution CASSINI-VIMS mosaics of Titan and the icy Saturnian satellites
R. Jaumann, K. Stephan, R. H. Brown, B. J. Buratti, R. N. Clark, T. B. McCord, A. Coradini, F. Capaccioni, G. Filacchione, P. Cerroni, K. H. Baines, G. Bellucci, J.-P. Bibring, M. Combes, D. P. Cruikshank, P. Drossart, V. Formisano, Y. Langevin, D. L. Matson, R.M. Nelson, P. D. Nicholson, B. Sicardy, Christophe Sotin, L. A. Soderblom, C. Griffith, K.-D. Matz, Th. Roatsch, F. Scholten, C.C. Porco
2006, Planetary and Space Science (54) 1146-1155
The Visual Infrared Mapping Spectrometer (VIMS) onboard the CASSINI spacecraft obtained new spectral data of the icy satellites of Saturn after its arrival at Saturn in June 2004. VIMS operates in a spectral range from 0.35 to 5.2 ??m, generating image cubes in which each pixel represents a spectrum consisting...
Crustal structure and tectonics of the northern part of the Southern Granulite Terrane, India
V.V. Rao, K. Sain, P.R. Reddy, Walter D. Mooney
2006, Earth and Planetary Science Letters (251) 90-103
Deep seismic reflection studies investigating the exposed Archean lower continental crust of the Southern Granulite Terrane, India, yield important constraints on the nature and evolution of the deep crust, including the formation and exhumation of granulites. Seismic reflection images along the Kuppam–Bhavani profile...
Modeling physical and biogeochemical controls over carbon accumulation in a boreal forest soil
J.J. Carrasco, J. C. Neff, J.W. Harden
2006, Journal of Geophysical Research G: Biogeosciences (111)
Boreal soils are important to the global C cycle owing to large C stocks, repeated disturbance from fire, and the potential for permafrost thaw to expose previously stable, buried C. To evaluate the primary mechanisms responsible for both short- and long-term C accumulation in boreal soils, we developed a multi-isotope...
Step wise, multiple objective calibration of a hydrologic model for a snowmelt dominated basin
L.E. Hay, G.H. Leavesley, M.P. Clark, S.L. Markstrom, Roland J. Viger, M. Umemoto
2006, Journal of the American Water Resources Association (42) 877-890
The ability to apply a hydrologic model to large numbers of basins for forecasting purposes requires a quick and effective calibration strategy. This paper presents a step wise, multiple objective, automated procedure for hydrologic model calibration. This procedure includes the sequential calibration of a model's simulation of solar radiation (SR),...
The use of landsat 7 enhanced thematic mapper plus for mapping leafy spurge
C.S. Mladinich, M.R. Bustos, S. Stitt, R. Root, K. Brown, G.L. Anderson, S. Hager
2006, Rangeland Ecology and Management (59) 500-506
Euphorbia esula L. (leafy spurge) is an invasive weed that is a major problem in much of the Upper Great Plains region, including parts of Montana, South Dakota, North Dakota, Nebraska, and Wyoming. Infestations in North Dakota alone have had a serious economic impact, estimated at $87 million annually in...
Testing of stack-unit/aquifer sensitivity analysis using contaminant plume distribution in the subsurface of Savannah River Site, South Carolina, USA
J.M. Rine, J.M. Shafer, E. Covington, R. C. Berg
2006, Hydrogeology Journal (14) 1620-1634
Published information on the correlation and field-testing of the technique of stack-unit/aquifer sensitivity mapping with documented subsurface contaminant plumes is rare. The inherent characteristic of stack-unit mapping, which makes it a superior technique to other analyses that amalgamate data, is the ability to deconstruct the sensitivity analysis on a unit-by-unit...
A simple method of predicting S-wave velocity
Myung W. Lee
2006, Geophysics (71)
Prediction of shear-wave velocity plays an important role in seismic modeling, amplitude analysis with offset, and other exploration applications. This paper presents a method for predicting S-wave velocity from the P-wave velocity on the basis of the moduli of dry rock. Elastic velocities of water-saturated sediments at low frequencies can...
Soluble reactive phosphorus transport and retention in tropical, rainforest streams draining a volcanic and geothermally active landscape in Costa Rica.: Long-term concentration patterns, pore water environment and response to ENSO events
F.J. Triska, C. M. Pringle, J.H. Duff, R.J. Avanzino, A. Ramirez, M. Ardon, A. P. Jackman
2006, Biogeochemistry (81) 131-143
Soluble reactive phosphorus (SRP) transport/retention was determined at four sites in three rainforest streams draining La Selva Biological Station, Costa Rica. La Selva is located at the base of the last remaining intact rainforest transect from 30 m above sea level to 3000 m along the entire Caribbean slope of...
