Modern Pearl River Delta and Permian Huainan coalfield, China: A comparative sedimentary facies study
P. Suping, R. M. Flores
1996, Conference Paper, Organic Geochemistry
Sedimentary facies types of the Pleistocene deposits of the Modern Pearl River Delta in Guangdong Province, China and Permian Member D deposits in Huainan coalfield in Anhui Province are exemplified by depositional facies of anastomosing fluvial systems. In both study areas, sand/sandstone and mud/mudstone-dominated facies types formed in diverging and...
Assessing variability and trends in Arctic sea ice distribution using satellite data
G. I. Belchansky, Ilia N. Mordvintsev, David C. Douglas
1996, Conference Paper, Proceedings, IGARSS 1996
Trends in the annual minimum, minimum monthly-mean, and the sea ice extent at the end of August were investigated for the Barents and western Kara Seas and adjacent parts of the Arctic Ocean during 1966 to 1994 using data from Russian ice maps (1974-1994), Kosmos-Okean and ALMAZ SAR satellite series...
Denitrification and nitrogen transport in a coastal aquifer receiving wastewater discharge
L.A. DeSimone, B.L. Howes
1996, Environmental Science & Technology (30) 1152-1162
Denitrification and nitrogen transport were quantified in a sandy glacial aquifer receiving wastewater from a septage-treatment facility on Cape Cod, MA. The resulting groundwater plume contained high concentrations of NO3- (32 mg of NL-1), total dissolved nitrogen (40.5 mg of N L-1), and dissolved organic carbon (1.9 mg of C...
The July 12, 1993, Hokkaido-Nansei-Oki, Japan, earthquake: Coseismic slip pattern from strong-motion and teleseismic recordings
C. Mendoza, E. Fukuyama
1996, Journal of Geophysical Research B: Solid Earth (101) 791-801
We employ a finite fault inversion scheme to infer the distribution of coseismic slip for the July 12, 1993 Hokkaido-Nansei-Oki earthquake using strong ground motions recorded by the Japan Meteorological Agency within 400 km of the epicenter and vertical P waveforms recorded by the Global Digital Seismograph Network at teleseismic distances. The...
Late quaternary environments, Denali National Park and Preserve, Alaska
Scott A. Elias, S. K. Short, Christopher F. Waythomas
1996, Arctic (49) 292-305
Late Quaternary pollen, plant macrofossils, and insect fossils were studied from sites along three rivers in the foothills north of the Alaska Range in Denali National Park and Preserve. The aim was to carry out a reconnaissance of late Quaternary organic sediments in the region, emphasizing the mid-Wisconsin, or Boutellier...
Observed and simulated movement of bank-storage water
P. J. Squillace
1996, Ground Water (34) 121-134
Detailed hydrologic and water-chemistry data were collected that document the movement of bank-storage water during March 7-April 17, 1990, in an alluvial aquifer adjacent to the Cedar River, Iowa. Hydrologic data included 745 daily ground-water-level measurements from 27 observation wells. Water-chemistry data indicate that bank-storage water had smaller specific conductance...
Tectonic model explaining divergent contraction directions along the Cascadia subduction margin, Washington
P. A. McCrory
1996, Geology (24) 929-932
Differential motion across the central Cascadia subduction boundary in Washington results in a complex pattern of folds and faults within the shelf and onshore parts of the accretionary margin. Faults and folds above a coastal, north-northwest–trending thrust system provide evidence of ongoing subduction-related...
Detailed observations of California foreshock sequences: Implications for the earthquake initiation process
D.A. Dodge, G. C. Beroza, W.L. Ellsworth
1996, Journal of Geophysical Research B: Solid Earth (101) 22371-22392
We find that foreshocks provide clear evidence for an extended nucleation process before some earthquakes. In this study, we examine in detail the evolution of six California foreshock sequences, the 1986 Mount Lewis (ML = 5.5), the 1986 Chalfant (ML = 6.4), the 1986 Stone Canyon (ML = 4.7), the 1990 Upland (ML =...
Bacterial dissimilatory reduction of arsenic(V) to arsenic(III) in anoxic sediments
P.R. Dowdle, A.M. Laverman, R.S. Oremland
1996, Applied and Environmental Microbiology (62) 1664-1669
Incubation of anoxic salt marsh sediment slurries with 10 mM As(V) resulted in the disappearance over time of the As(V) in conjunction with its recovery as As(III). No As(V) reduction to As(III) occurred in heat- sterilized or formalin-killed controls or in live sediments incubated in air. The rate of As(V)...
Population delineation of polar bears using satellite collar data
R. Bethke, Mitchell K. Taylor, Steven C. Amstrup, Francois Messier
1996, Ecological Applications (6) 311-317
To produce reliable estimates of the size or vital rates of a given population, it is important that the boundaries of the population under study are clearly defined. This is particularly critical for large, migratory animals where levels of sustainable harvest are based on these estimates, and where small errors...
Pattern recognition analysis and classification modeling of selenium-producing areas
D. L. Naftz
1996, Journal of Chemometrics (10) 309-324
Established chemometric and geochemical techniques were applied to water quality data from 23 National Irrigation Water Quality Program (NIWQP) study areas in the Western United States. These techniques were applied to the NIWQP data set to identify common geochemical processes responsible for mobilization of selenium and to develop a classification...
Expanded record of Quaternary oceanographic change: Amerasian Arctic Ocean
S. E. Ishman, L.V. Polyak, R.Z. Poore
1996, Geology (24) 139-142
Four sediment cores collected from the Northwind and Mendeleyev ridges, Arctic Ocean, from 1089 m to 1909 m water depth, provide an oceanographic record extending back into the Matuyama reversed polarity chron. Benthic foraminiferal analyses show four prominent assemblage zones: Bolivina arctica, Cassidulina teretis, Bulimina aculeata,...
Is internal friction friction?
J.C. Savage, J.D. Byerlee, D.A. Lockner
1996, Geophysical Research Letters (23) 487-490
Mogi [1974] proposed a simple model of the incipient rupture surface to explain the Coulomb failure criterion. We show here that this model can plausibly be extended to explain the Mohr failure criterion. In Mogi's model the incipient rupture surface immediately before fracture consists of areas across...
Occurrence and accumulation of pesticides and organic contaminants in river sediment, water and clam tissues from the San Joaquin River and tributaries, California
W. E. Pereira, Joseph L. Domagalski, F. D. Hostettler, L. R. Brown, J. B. Rapp
1996, Environmental Toxicology and Chemistry (15) 172-180
A study was conducted in 1992 to assess the effects of anthropogenic activities and land use on the water quality of the San Joaquin River and its major tributaries. This study focused on pesticides and organic contaminants, looking at distributions of contaminants in water, bed and suspended sediment, and the...
Water supply implications of herbicide sampling
J. K. Stamer
1996, Journal - American Water Works Association (88) 76-85
Hydrologic conditions may affect concertrations of organonitrogen herbicides and may be important considerations in complying with drinking water regulations.The temporal distribution of the herbicides alachlor, atrazine, cyanazine, and metolachlor was documented from September 1991 through August 1992 in the Platte River at Louisville, Neb., the drainage of the Central Nebraska...
An unusual pattern of recurring seismic quiescence at Kalapana, Hawaii
James H. Dieterich, P. G. Okubo
1996, Geophysical Research Letters (23) 447-450
An unusual pattern of recurring seismic quiescence is observed in the Kalapana, Hawaii region of Kilauea Volcano. Statistically significant intervals of quiescence preceded the Kalapana earthquakes of 1975 (M7.2) and 1989 (M6.1) and a third quiescence is presently underway. The sensitivity of the volcano flank to...
Amphibian and reptile abundance in riparian and upslope areas of five forest types in western Oregon
D.M. Gomez, R.G. Anthony
1996, Northwest Science (70) 109-119
We compared species composition and relative abundance of herpetofauna between riparian and upslope habitats among 5 forest types (shrub, open sapling-pole, large sawtimber and old-growth conifer forests, and deciduous forests) in Western Oregon. Riparian- and upslope- associated species were identified based on capture frequencies from pitfall trapping. Species richness was similar among forest...
Hydrogeologic controls on the groundwater interactions with an acidic lake in karst terrain, Lake Barco, Florida
T. M. Lee
1996, Water Resources Research (32) 831-844
Transient groundwater interactions and lake stage were simulated for Lake Barco, an acidic seepage lake in the mantled karst of north central Florida. Karst subsidence features affected groundwater flow patterns in the basin and groundwater fluxes to and from the lake. Subsidence features peripheral to the lake intercepted potential groundwater...
Slip history of the 1995 Kobe, Japan, earthquake determined from strong motion, teleseismic, and geodetic data
D.J. Wald
1996, Journal of Physics of the Earth (44) 489-503
Near-source ground motions, teleseismic body waveforms, and geodetic displacements produced by the 1995 Kobe, Japan, earthquake have been used to determine the spatial and temporal dislocation pattern on the faulting surfaces. A linear, least-squares approach was used to invert the data sets both independently and in unison in order to...
Use of SAR data to study active volcanoes in Alaska
K.G. Dean, K. Engle, Z. Lu, J. Eichelberger, T. Near, M. Doukas
1996, Earth Observation Quarterly 21-23
Synthetic Aperture Radar (SAR) data of the Westdahl, Veniaminof, and Novarupta volcanoes in the Aleutian Arc of Alaska were analysed to investigate recent surface volcanic processes. These studies support ongoing monitoring and research by the Alaska Volcano Observatory (AVO) in the North Pacific Ocean Region. Landforms and possible crustal deformation...
Shallow subsurface geology of part of the Savannah River alluvial valley in the upper Coastal Plain of Georgia and South Carolina
D.C. Leeth, D.D. Nagle
1996, Southeastern Geology (36) 1-14
The depth to which Coastal Plain rivers incise underlying formations is an important control on local and regional hydrologic flow systems. In order to clarify these stream/aquifer relations, a better understanding of the shallow subsurface geology of the Savannah River was necessary. To accomplish this, three drillhole transects were completed...
Establishing the moon as a spectral radiance standard
H. H. Kieffer, R.L. Wildey
1996, Journal of Atmospheric and Oceanic Technology (13) 360-375
A new automated observatory dedicated to the radiometry of the moon has been constructed to provide new radiance information for calibration of earth-orbiting imaging instruments, particularly Earth Observing System instruments. Instrumentation includes an imaging photometer with 4.5-in. resolution on a fully digital mount and a full-aperture radiance calibration source. Interference...
Influence of electron donor on the minimum sulfate concentration required for sulfate reduction in a petroleum hydrocarbon-contaminated aquifer
D.A. Vroblesky, P. M. Bradley, F. H. Chapelle
1996, Environmental Science & Technology (30) 1377-1381
Fluctuations in the availability of electron donor (petroleum hydrocarbons) affected the competition between sulfate-reducing bacteria (SRB) and methanogenic bacteria (MB) for control of electron flow in a petroleum hydrocarbon-contaminated aquifer. The data suggest that abundant electron donor availability allowed MB to sequester a portion of the electron flow even when...
Lead-isotopic, sulphur-isotopic, and trace-element studies of galena from the Silesian-Cracow Zn-Pb ores, polymetallic veins from the Gory Swietokrzyskie MTS, and the Myszkow porphyry copper deposit, Poland
S. E. Church, R. B. Vaughn, C. A. Gent, R.T. Hopkins
1996, Prace - Panstwowego Instytutu Geologicznego (154) 138-156
Lead-isotopic data on galena samples collected from a paragenetically constrained suite of samples from the Silesian-Cracow ore district show no regional or paragenetically controlled lead-isotopic trends within the analytical reproducibility of the measurements. Furthermore, the new lead-isotopic data agree with previously reported lead-isotopic results (R. E. Zartman et al., 1979)....
Breeding populations of northern pintails have similar mitochondrial DNA
M. A. Cronin, J.B. Grand, Daniel Esler, D.V. Derksen, K.T. Scribner
1996, Canadian Journal of Zoology (74) 992-999
Northern pintails (Anas acuta) are highly nomadic, which may result in high levels of gene flow among nesting areas. To assess the extent of genetic differentiation among nesting areas, we analyzed mitochondrial DNA (mtDNA) variation in northern pintail females from three regions: Alaska, California, and midcontinent prairies and parklands. Abundant mtDNA...
