Tephra-fall deposits from the 1992 eruption of Crater Peak, Alaska: implications of clast textures for eruptive processes
C. A. Gardner, K. V. Cashman, C.A. Neal
1998, Bulletin of Volcanology (59) 537-555
The 1992 eruption of Crater Peak, Mount Spurr, Alaska, involved three subplinian tephra-producing events of similar volume and duration. The tephra consists of two dense juvenile clast types that are identified by color, one tan and one gray, of similar chemistry, mineral assemblage, and glass composition. In two of the...
Coseismic temporal changes of slip direction: The effect of absolute stress on dynamic rupture
Mariagiovanna Guatteri, P. Spudich
1998, Bulletin of the Seismological Society of America (88) 777-789
We investigate the dynamics of rupture at low-stress level. We show that one main difference between the dynamics of high- and low-stress events is the amount of coseismic temporal rake rotation occurring at given points on the fault. Curved striations on exposed fault surfaces and earthquake dislocation models derived from...
Tidally oriented vertical migration and position maintenance of zooplankton in a temperate estuary
W.J. Kimmerer, J.R. Burau, W.A. Bennett
1998, Limnology and Oceanography (43) 1697-1709
In many estuaries, maxima in turbidity and abundance of several common species of zooplankton occur in the low salinity zone (LSZ) in the range of 0.5-6 practical salinity units (psu). Analysis of zooplankton abundance from monitoring in 1972-1987 revealed that historical maxima in abundance of the copepod Eurytemora affinis and...
Seasonal migration and homing of channel catfish in the lower Wisconsin River, Wisconsin
Thomas D. Pellett, Gene J. Van Dyck, Jean V. Adams
1998, North American Journal of Fisheries Management (18) 85-95
A multiyear tag and recapture study was conducted to determine whether channel catfishIctalurus punctatus were migratory and if they had strong homing tendencies. Over 10,000 channel catfish were tagged from the lower Wisconsin River and adjacent waters of the upper Mississippi River during the 3-year sampling period. Data on movements were...
Core drilling provides information about Santa Fe Group aquifer system beneath Albuquerque's West Mesa
B.D. Allen, S.D. Connell, J.W. Hawley, B. D. Stone
1998, New Mexico Geology (20) 8-13
Core samples from the upper ???1500 ft of the Santa Fe Group in the Albuquerque West Mesa area provide a first-hand look at the sediments and at subsurface stratigraphic relationships in this important part of the basin-fill aquifer system. Two major hydrostratigraphic subunits consisting of a lower coarse-grained, sandy interval...
Abrupt shift in δ18O values at Medicine Lake volcano (California, USA)
J.M. Donnelly-Nolan
1998, Bulletin of Volcanology (59) 529-536
Oxygen-isotope analyses of lavas from Medicine Lake volcano (MLV), in the southern Cascade Range, indicate a significant change in δ18O in Holocene time. In the Pleistocene, basaltic lavas with <52% SiO2 averaged +5.9‰, intermediate lavas averaged +5.7‰, and silicic lavas (≥63.0%SiO2) averaged +5.6‰. No analyzed Pleistocene rhyolites or dacites...
Relationships between wind velocity and underwater irradiance in a shallow lake (Lake Okeechobee, Florida, USA)
C.G. Hanlon, R. L. Miller, B. F. McPherson
1998, Journal of the American Water Resources Association (34) 951-961
ABSTRACT: Relationships between wind velocity and the vertical light attenuation coefficient (K0) were determined at two locations in a large, shallow lake (Lake Okeechobee, Florida, USA). K0 was significantly correlated with antecedent wind conditions, which explained as much as 90 percent of the daily variation in K0.Sub-surface...
Evidence for growth hormone/insulin-like growth factor I axis regulation of seawater acclimation in the euryhaline teleost Fundulus heteroclitus
J. M. Mancera, S. D. McCormick
1998, General and Comparative Endocrinology (111) 103-112
The ability of ovine growth hormone (oGH), recombinant bovine insulin- like growth factor I (rbIGF-I), recombinant human insulin-like growth factor II (rhIGF-II), and bovine insulin to increase hypoosmoregulatory capacity in the euryhaline teleost Fundulus heteroclitus was examined. Fish acclimated to brackish water (BW, 10 ppt salinity, 320 mOsm/kg H2O) were...
Aqueous infrared carboxylate absorbances: Aliphatic di-acids
S.E. Cabaniss, J.A. Leenheer, I.F. McVey
1998, Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy (54) 449-458
Aqueous attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectra of 18 aliphatic di-carboxylic acids are reported as a function of pH. The spectra show isosbestic points and intensity changes which indicate that Beer's law is obeyed, and peak frequencies lie within previously reported ranges for aqueous carboxylates and...
Consumption of materials in the United States, 1900-1995
G. Matos, L. Wagner
1998, Annual Review of Energy and the Environment (23) 107-122
The flows of nonfood and nonfuel materials through the economy have significant impact on our lives and the world around us. Growing populations and economies demand more goods, services, and infrastructure. Since the beginning of the twentieth century, the types of materials consumed in the United States have significantly changed....
Analysis of transient storage subject to unsteady flow: Diel flow variation in an Antarctic stream
R.L. Runkel, Diane M. McKnight, E.D. Andrews
1998, Journal of the North American Benthological Society (17) 143-154
Transport of dissolved material in streams and small rivers may be characterized using tracer-dilution methods and solute transport models. Recent studies have quantified stream/substream interactions using models of transient storage. These studies are based on tracer-dilution data obtained during periods of steady flow. We present...
Simulated effects of irrigation on salinity in the Arkansas River Valley in Colorado
K. Goff, M.E. Lewis, M.A. Person, Leonard F. Konikow
1998, Ground Water (36) 76-86
Agricultural irrigation has a substantial impact on water quantity and quality in the lower Arkansas River valley of southeastern Colorado. A two-dimensional flow and solute transport model was used to evaluate the potential effects of changes in irrigation on the quantity and quality of water in the alluvial aquifer and...
Recommended nomenclature for zeolite minerals: Report of the subcommittee on zeolites of the International Mineralogical Association, Commission of New Minerals and Mineral Names
D.S. Coombs, A. Alberti, T. Armbruster, G. Artioli, C. Colella, E. Galli, Joel D. Grice, F. Liebau, J.A. Mandarino, H. Minato, E.H. Nickel, E. Passaglia, D.R. Peacor, S. Quartieri, R. Rinaldi, M. Ross, R.A. Sheppard, E. Tillmanns, G. Vezzalini
1998, Mineralogical Magazine (62) 533-571
This report embodies recommendations on zeolite nomenclature approved by the International Mineralogical Association Commission of New Minerals and Mineral Names. In a working definition of a zeolite mineral used for review, interrupted tetrahedral framework structures are accepted where other zeolitic properties prevail, and complete substitution by elements other than Si...
Geographic, temporal, and age-specific variation in diets of Glaucous Gulls in western Alaska
Joel A. Schmutz, K.A. Hobson
1998, Condor (100) 119-130
We collected boluses and food remains of adult Glaucous Gulls (Larus hyperboreus) at or near nests and chicks, and digestive tracts from adults at three sites on the Yukon-Kuskokwim Delta, Alaska that differed in proximity to marine and terrestrial foods. We observed both geographic and temporal variation in diet; gulls...
Displacement field for an edge dislocation in a layered half-space
J.C. Savage
1998, Journal of Geophysical Research B: Solid Earth (103) 2439-2446
The displacement field for an edge dislocation in an Earth model consisting of a layer welded to a half-space of different material is found in the form of a Fourier integral following the method given by Weeks et al. [1968]. There are four elementary solutions to be considered: the dislocation is either...
Nature and regional significance of unconformities associated with the Middle Ordovician Hagan K-bentonite complex in the North American midcontinent
Dennis R. Kolata, W.D. Huff, Stig M. Bergstrom
1998, Geological Society of America Bulletin (110) 723-739
Stratal patterns of the Middle Ordovician Hagan K-bentonite complex and associated rocks show that the Black River–Trenton unconformity in the North American midcontinent formed through the complex interplay of eustasy, sediment accumulation rates, siliciclastic influx, bathymetry, seawater chemistry, and perhaps local tectonic uplift. The unconformity is diachronous and is an...
Observations of geese foraging for clam shells during spring on the Yukon-Kuskokwim Delta, Alaska
Paul L. Flint, Ada C. Fowler, Grace E. Bottitta, Jason L. Schamber
1998, The Wilson Bulletin (110) 411-413
We studied the behavior of geese on exposed river ice during spring on the Yukon-Kuskokwim Delta. The predominant behavior while on the ice for both sexes was foraging; however, females foraged more than males. Visual inspection of the ice revealed no potential plant or animal food items. However, numerous small...
Tracing hydrologic pathways using chloride at the Panola mountain research watershed, Georgia, USA
N.E. Peters, E.B. Ratcliffe
1998, Water, Air, & Soil Pollution (105) 263-275
An analysis of chloride (Cl-) concentrations and fluxes at the 41 ha Panola Mountain Research Watershed indicates that Cl- may be used effectively to differentiate 'new' and 'old' water flow through the hillslope and their respective contributions to streamwater. Rainfall and throughfall, the 'new' water inputs, are marked by low...
Effect of groundwater springs on NO3− concentrations during summer in Catskill Mountain streams
Douglas A. Burns, Peter S. Murdoch, Gregory B. Lawrence, Robert L. Michel
1998, Water Resources Research (34) 1987-1996
Groundwater and stream water data collected at three headwater catchments in the Neversink River watershed indicate that base flow is sustained by groundwater from two sources: a shallow flow system within the till and soil and a deep flow system within bedrock fractures and bedding planes that discharges as perennial...
Estimating formation properties from early-time recovery in wells subject to turbulent head losses
A.M. Shapiro, D.S. Oki, E.A. Greene
1998, Journal of Hydrology (208) 223-236
A mathematical model is developed to interpret the early-time recovering water level following the termination of pumping in wells subject to turbulent head losses. The model assumes that turbulent head losses dissipate immediately when pumping ends. In wells subject to both borehole storage and turbulent head losses, the early-time recovery...
Soil relative dating of moraine and outwash-terrace sequences in the northern part of the upper Arkansas Valley, central Colorado, U.S.A.
Alan R. Nelson, Ralph R. Shroba
1998, Arctic and Alpine Research (30) 349-361
Profile development indices for soils developed in moraines and outwash near Twin Lakes and in outwash near Leadville support the correlation of moraines with subdued morphology and two high outwash terraces with the Bull Lake glaciation (ca. 130-160 ka) and the correlation of hummocky moraines and two low outwash terraces...
Groundwater geochemistry of Isla de Mona, Puerto Rico
C.M. Wicks, J.W. Troester
1998, Journal of Cave and Karst Studies (60) 107-114
In this study, we explore the differences between the hydrogeochemical processes observed in a setting that is open to input from the land surface and in a setting that is closed with respect to input from the land surface. The closed setting was a water-filled passage in a cave. Samples...
High-resolution Monte Carlo simulation of flow and conservative transport in heterogeneous porous media: 2. Transport results
R.L. Naff, D.F. Haley, E.A. Sudicky
1998, Water Resources Research (34) 679-697
In this, the second of two papers concerned with the use of numerical simulation to examine flow and transport parameters in heterogeneous porous media via Monte Carlo methods, results from the transport aspect of these simulations are reported on. Transport simulations contained herein assume a finite pulse input of conservative...
Data from selected U.S. Geological Survey National Stream Water Quality Monitoring Networks
Richard B. Alexander, James R. Slack, Amy S. Ludtke, Kathleen K. Fitzgerald, Terry L. Schertz
1998, Water Resources Research (34) 2401-2405
A nationally consistent and well-documented collection of water quality and quantity data compiled during the past 30 years for streams and rivers in the United States is now available on CD-ROM and accessible over the World Wide Web. The data include measurements from two U.S. Geological Survey (USGS) national networks...
A technique for estimating the accuracy of fish locations identified by radiotelemetry
D.G. Simpkins, W.A. Hubert
1998, Journal of Freshwater Ecology (13) 263-268
Radiotelemetry is a useful tool to describe habitat use by fish, but studies may inaccurately describe microhabitat use due to failure to account for errors when identifying fish locations. We developed a technique that identifies the extent of location errors of a hand-held radiotelemetry system. The ranges of...
