Origins of high-frequency scattered waves near PKKP from large aperture seismic array data
P.S. Earle
2002, Bulletin of the Seismological Society of America (92) 751-760
This article identifies the likely origin of 1-Hz scattered waves in the vicinity of PKKP by comparing measurements of slowness and onset time to ray-theoretical predictions. The measurements are obtained from slant stacks of Large Aperture Seismic Array (LASA) data from 36 earthquakes and six explosions in the range 30??-116??....
Quantifying flow-dependent changes in subyearling fall chinook salmon rearing habitat using two-dimensional spatially explicit modeling
K.F. Tiffan, R.D. Garland, D.W. Rondorf
2002, North American Journal of Fisheries Management (22) 713-726
We used an analysis based on a geographic information system (GIS) to determine the amount of rearing habitat and stranding area for subyearling fall chinook salmon Oncorhynchus tshawytscha in the Hanford Reach of the Columbia River at steady-state flows ranging from 1,416 to 11,328 m3/s. High-resolution river channel bathymetry was...
Earthquakes
S. E. Hough
2002, Geotimes (47) 12-17
[No abstract available]...
A bilinear source-scaling model for M-log a observations of continental earthquakes
Thomas C. Hanks, W. H. Bakun
2002, Bulletin of the Seismological Society of America (92) 1841-1846
The Wells and Coppersmith (1994) M-log A data set for continental earthquakes (where M is moment magnitude and A is fault area) and the regression lines derived from it are widely used in seismic hazard analysis for estimating M, given A. Their relations are well determined, whether for the full...
Annual emissions of mercury to the atmosphere from natural sources in Nevada and California
M.F. Coolbaugh, M.S. Gustin, J. J. Rytuba
2002, Environmental Geology (42) 338-349
The impact of natural source emissions on atmospheric mercury concentrations and the biogeochemical cycle of mercury is not known. To begin to assess this impact, mercury emissions to the atmosphere were scaled up for three areas naturally enriched in mercury: the Steamboat Springs geothermal area, Nevada, the New Idria mercury...
Modeling enhanced in situ denitrification in groundwater
M.W. Killingstad, M.A. Widdowson, R. L. Smith
2002, Journal of Environmental Engineering (128) 491-504
A two-dimensional numerical solute transport model was developed for simulating an enhanced in situ denitrification experiment performed in a nitrate-contaminated aquifer on Cape Cod, Massachusetts. In this experiment, formate (HCOO-)">(HCOO-) was injected for a period of 26 days into the carbon-limited aquifer to stimulate denitrification....
Anadromous alewives, Alosa pseudoharengus, as prey for white perch, Morone americana
J.R. Moring, L.H. Mink
2002, Hydrobiologia (479) 125-130
The reintroduction of anadromous alewives, Alosa pseudoharengus, to their historic habitats in the inland waters of the United States and Canada, has prompted concerns about possible interactions with a popular sport fish, white perch, Morone americana. Both species are now widely distributed in northeastern North America. Diets of white perch...
Crosswell seismic investigation of hydraulically conductive, fracture bedrock near Mirror Lake, New Hampshire
K.J. Ellefsen, P. A. Hsieh, A.M. Shapiro
2002, Journal of Applied Geophysics (50) 299-317
Near Mirror Lake, New Hampshire (USA), hydraulically conductive, fractured bedrock was investigated with the crosswell seismic method to determine whether this method could provide any information about hydraulic conductivity between wells. To this end, crosswell seismic data, acoustic logs from boreholes, image logs from...
Gold deposits in the Xiaoqinling-Xiong'ershan region, Qinling mountains, central China
J. Mao, R.J. Goldfarb, Z. Zhang, W. Xu, Yumin Qiu, J. Deng
2002, Mineralium Deposita (37) 306-325
The gold-rich Xiaoqinling-Xiong'ershan region in eastern Shaanxi and western Henan provinces, central China, lies about 30-50 km inland of the southern margin of the North China craton. More than 100 gold deposits and occurrences are concentrated in the Xiaoqinling (west), Xiaoshan (middle), and Xiong'ershan (east) areas. Late Archean gneiss of...
Spatial variability of shelf sediments in the STRATAFORM natural laboratory, Northern California
J.A. Goff, R. A. Wheatcroft, H. Lee, D.E. Drake, D.J.P. Swift, S. Fan
2002, Continental Shelf Research (22) 1199-1223
The "Correlation Length Experiment", an intensive box coring effort on the Eel River shelf (Northern California) in the summer of 1997, endeavored to characterize the lateral variability of near-surface shelf sediments over scales of meters to kilometers. Coring focused on two sites, K60 and S60, separated by ??? 15 km...
Sensitivity of breeding parameters to food supply in Black-legged Kittiwakes Rissa tridactyla
Verena A. Gill, Scott A. Hatch, Richard B. Lanctot
2002, Ibis (144) 268-283
We fed Herring Clupea pallasi to pairs of Black-legged Kittiwakes Rissa tridactyla throughout the breeding season in two years at a colony in the northern Gulf of Alaska. We measured responses to supplemental feeding in a wide array of breeding parameters to gauge their relative sensitivity to food supply, and...
Hydrocarbons in recent sediment of the Monterey Bay National Marine Sanctuary
K.A. Kvenvolden, F. D. Hostettler, R.W. Rosenbauer, T.D. Lorenson, W.T. Castle, S. Sugarman
2002, Marine Geology (181) 101-113
A complex mixture of hydrocarbons is present in the recent sediment of the Monterey Bay National Marine Sanctuary. Eighteen samples from the continental shelf between San Francisco and Monterey contain aliphatic and aromatic hydrocarbons showing biological contributions from both marine and terrigenous sources, with the terrigenous indicators more pronounced near...
Continental shelf GIS for the Monterey Bay National Marine Sanctuary
F. L. Wong, S.L. Eittreim
2002, Marine Geology (181) 317-321
A marine sanctuary is an environment where the interests of science and society meet. Land and marine managers need access to the best scientific data available that describe the environment and environmental processes in sanctuaries. The sidescan sonar imagery, bathymetry, sample analyses and other data discussed in the papers in...
Isotope variations in a Sierra Nevada snowpack and their relation to meltwater
P.V. Unnikrishna, Jeffery J. McDonnell, C. Kendall
2002, Journal of Hydrology (260) 38-57
Isotopic variations in melting snow are poorly understood. We made weekly measurements at the Central Sierra Snow Laboratory, California, of snow temperature, density, water equivalent and liquid water volume to examine how physical changes within the snowpackgovern meltwater δ18O. Snowpack samples were extracted at 0.1 m intervals from ground level to the top of...
Using groundwater temperature data to constrain parameter estimation in a groundwater flow model of a wetland system
Hector R. Bravo, Feng Jiang, Randall J. Hunt
2002, Water Resources Research (38) 28-1-28-14
Parameter estimation is a powerful way to calibrate models. While head data alone are often insufficient to estimate unique parameters due to model nonuniqueness, flow‐and‐heat‐transport modeling can constrain estimation and allow simultaneous estimation of boundary fluxes and hydraulic conductivity. In this work, synthetic and field models that did not converge...
Fluvial sediment transport and deposition following the 1991 eruption of Mount Pinatubo
S.K. Hayes, D. R. Montgomery, C. G. Newhall
2002, Geomorphology (45) 211-224
The 1991 eruption of Mount Pinatubo generated extreme sediment yields from watersheds heavily impacted by pyroclastic flows. Bedload sampling in the Pasig-Potrero River, one of the most heavily impacted rivers, revealed negligible critical shear stress and very high transport rates that reflected an essentially unlimited sediment supply and the enhanced...
Residency and movement patterns of wintering dunlin in the Willamette Valley of Oregon
Peter M. Sanzenbacher, Susan M. Haig
2002, Condor (104) 271-280
In the winters of 1998–1999 and 1999–2000, we tracked 67 radio-marked Dunlin (Calidris alpina) throughout the complex agricultural landscape of the Willamette Valley of Oregon. Individual birds were tracked across 8-week sampling periods and indicated a high degree of regional fidelity throughout the three winter sampling periods. Birds exhibited varied...
Abundances of northwestern salamander larvae in montane lakes with and without fish, Mount Rainier National Park, Washington
Gary L. Larson, Robert L. Hoffman
2002, Northwest Science (76) 35-40
In Mount Rainier National Park, the northwestern salamander usually inhabits relatively large and deep lakes and ponds (average size = 0.3 ha; average depth > 2 m) that contain flocculent, organic bottom sediments and abundant coarse wood. Prior to 1970, salmonids were introduced into many of the park's lakes and...
Depositional history and neotectonics in Great Salt Lake, Utah, from high-resolution seismic stratigraphy
Steven M. Colman, K.R. Kelts, David A. Dinter
2002, Sedimentary Geology (148) 61-78
High-resolution seismic-reflection data from Great Salt Lake show that the basinal sediment sequence is cut by numerous faults with N-S and NE-SW orientations. This faulting shows evidence of varied timing and relative offsets, but includes at least three events totaling about 12 m following the Bonneville phase of the lake...
Organochlorine chemical residues in fish from the Mississippi River basin, 1995
C. J. Schmitt
2002, Archives of Environmental Contamination and Toxicology (43) 81-97
Fish were collected in late 1995 from 34 National Contaminant Biomonitoring Program (NCBP) stations and 13 National Water Quality Assessment Program (NAWQA) stations in the Mississippi River basin (MRB) and in late 1996 from a reference site in West Virginia. Four composite samples, each comprising (nominally) 10 adult common carp...
A serotype-specific polymerase chain reaction for identification of Pasteurella multocida serotype 1
Tonie E. Rocke, S.R. Smith, A. Miyamoto, D.J. Shadduck
2002, Avian Diseases (46) 370-377
A serotype-specific polymerase chain reaction (PCR) assay was developed for detection and identification of Pasteurella multocida serotype 1, the causative agent of avian cholera in wild waterfowl. Arbitrarily primed PCR was used to detect DNA fragments that distinguish serotype 1 from the other 15 serotypes of P. multocida (with the...
Bedform movement recorded by sequential single-beam surveys in tidal rivers
R.L. Dinehart
2002, Journal of Hydrology (258) 25-39
A portable system for bedform-mapping was evaluated in the delta of the lower Sacramento and San Joaquin Rivers, California, from 1998 to 2000. Bedform profiles were surveyed with a two-person crew using an array of four single-beam transducers on boats about 6 m in length. Methods for processing the bedform...
The dynamics of subtidal poleward flows over a narrow continental shelf, Palos Verdes, CA
M.A. Noble, H. F. Ryan, P.L. Wiberg
2002, Continental Shelf Research (22) 923-944
The Palos Verdes peninsula is a short, very narrow (< 3 km) shelf in southern California that is bracketed by two large embayments. In May 1992, arrays of up to 4 moorings and 2 benthic tripods were deployed in a yearlong study of the circulation processes over this shelf and...
A budget of marine and terrigenous sediments, Hanalei Bay, Kauai, Hawaiian Islands
R.S. Calhoun, C. H. Fletcher, J.N. Harney
2002, Sedimentary Geology (150) 61-87
The sediment budget of Hanalei Bay on the north shore of Kauai was calculated using sedimentological and geophysical methods. The calculations of the budget subsequently allowed an interpretation of the Holocene history of the bay. The bay sediments are easily separated into marine (carbonate) and terrigenous (siliciclastic) grains. Surficial sediments...
Selenium stable isotope ratios in California agricultural drainage water management systems
M.J. Herbel, T.M. Johnson, K.K. Tanji, S. Gao, T.D. Bullen
2002, Journal of Environmental Quality (31) 1146-1156
Selenium stable isotope ratios are known to shift in predictable ways during various microbial, chemical, and biological processes, and can be used to better understand Se cycling in contaminated environments. In this study we used Se stable isotopes to discern the mechanisms controlling the transformation of oxidized, aqueous forms of...
