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University of Nebraska - Lincoln

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Articles 3271 - 3300 of 4541

Full-Text Articles in Earth Sciences

Detailed Observations Of California Foreshock Sequences: Implications For The Earthquake Initiation Process, Douglas A. Dodge, Gregory C. Beroza, W. L. Ellsworth Jan 1996

Detailed Observations Of California Foreshock Sequences: Implications For The Earthquake Initiation Process, Douglas A. Dodge, Gregory C. Beroza, W. L. Ellsworth

United States Geological Survey: Staff Publications

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 = 5.2), the 1992 Joshua Tree (Mw= 6.1), and the 1992 Landers (Mw = 7.3) sequence. Typically, uncertainties in hypocentral parameters are too large to establish the geometry of foreshock sequences and hence to understand their evolution. However, the similarity …

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Effect Of Nitrate, Organic Carbon, And Temperature On Potential Denitrification Rates In Nitrate-Rich Riverbed Sediments, K. S. Pfenning, P. B. Mcmahon Jan 1996

Effect Of Nitrate, Organic Carbon, And Temperature On Potential Denitrification Rates In Nitrate-Rich Riverbed Sediments, K. S. Pfenning, P. B. Mcmahon

United States Geological Survey: Staff Publications

A study conducted in 1994 as part of the US Geological Survey's National Water-Quality Assessment Program, South Platte River Basin investigation, examined the effect of certain environmental factors on potential denitrification rates in nitrate-rich riverbed sediments. The acetylene block technique was used to measure nitrous oxide (N2O) production rates in laboratory incubations of riverbed sediments to evaluate the effect of varying nitrate concentrations, organic carbon concentrations and type, and water temperature on potential denitrification rates. Sediment incubations amended with nitrate, at concentrations ranging from 357 to 2142 μmol 1-1 (as measured in the field), produced no significant …

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Observations On Bats At Badlands National Park, South Dakota, Michael A. Bogan, Jeffrey G. Osborne, Jennifer A. Clarke Jan 1996

Observations On Bats At Badlands National Park, South Dakota, Michael A. Bogan, Jeffrey G. Osborne, Jennifer A. Clarke

United States Geological Survey: Staff Publications

During the summers of 1992 and 1993, we conducted a survey of bats at Badlands National Park, South Dakota. Using mist nets, we captured bats and recorded species, sex, age class, and reproductive condition for each individual netted. We recorded five species, Myotis ciliolabrnm (n = 198), M. thysanodes (29), M volans (13), Eptesicus foscus (91), and Plecotus tawnsendii (43), previously known from the park. In addition, we added four species, M lucifugus (18), M. septentrionalis (9), Lasionycteris noctivagans (1), and Lasiurns cinereus (3) to the confirmed fauna of the park. Most bats captured were male (76.3%) although maternity colonies …

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Multiport Well Design For Sampling Of Ground Water At Closely Spaced Vertical Intervals, Geoffrey N. Delin, Matthew K. Landon Jan 1996

Multiport Well Design For Sampling Of Ground Water At Closely Spaced Vertical Intervals, Geoffrey N. Delin, Matthew K. Landon

United States Geological Survey: Staff Publications

Detailed vertical sampling is useful in aquifers where vertical mixing is limited and steep vertical gradients in chemical concentrations are expected.

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Sources Of Variation In Counts Of Meristic Features Of Yellowstone Cutthroat Trout (Oncorhynchus Clarki Bouvieri), Carter Kruse, Wayne Hubert, Frank Rahel Jan 1996

Sources Of Variation In Counts Of Meristic Features Of Yellowstone Cutthroat Trout (Oncorhynchus Clarki Bouvieri), Carter Kruse, Wayne Hubert, Frank Rahel

United States Geological Survey: Staff Publications

We determined variability in counts of meristic features (pyloric caecae, vertebrae, pelvic fin rays, gillrakers, basibranchial teeth, scales above the lateral line, and scales in the lateral series) of Yellowstone cutthroat trout (Oncorhynchus clarki bouvieri ) by 3 independent readers, by the same reader on 3 different occasions, and among fish from 12 sampling sites within a 650-km2 watershed. Genetic purity of the cutthroat trout was determined by electrophoretic analysis. Significant differences in meristic counts were observed among 3 readers and among sampling sites, but not among 3 occasions by a single reader. Scale counts were within the …

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Groundwater-Level Changes In Nebraska, Predevelopment To Spring 1994, Mack Ann, Jim Weir, Jennifer Sharpe Jan 1996

Groundwater-Level Changes In Nebraska, Predevelopment To Spring 1994, Mack Ann, Jim Weir, Jennifer Sharpe

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Geology Of The Liquid Propane Gas Storage Facility Near Greenwood, Nebraska, R. R. Burchett Jan 1996

Geology Of The Liquid Propane Gas Storage Facility Near Greenwood, Nebraska, R. R. Burchett

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Resource Notes-Academic Year 1995-96 Jan 1996

Resource Notes-Academic Year 1995-96

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Resource News-Winter 1995-96 Jan 1996

Resource News-Winter 1995-96

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Rural Domestic Well-Water Quality In The Sand Hills, D C. Gosselin Jan 1996

Rural Domestic Well-Water Quality In The Sand Hills, D C. Gosselin

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Hydrogeologic Summaries From Domestic Water-Well Quality In Nebraska -- Hat Creek-White River Drainage Basin, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside Jan 1996

Regional Hydrogeologic Summaries From Domestic Water-Well Quality In Nebraska -- Hat Creek-White River Drainage Basin, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Analysis Of Rural Domestic Well-Water Quality -- Platte River Valley, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside Jan 1996

Regional Analysis Of Rural Domestic Well-Water Quality -- Platte River Valley, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Analysis Of Rural Domestic Well-Water Quality -- Missouri River Lowlands, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside Jan 1996

Regional Analysis Of Rural Domestic Well-Water Quality -- Missouri River Lowlands, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Analysis Of Rural Domestic Well-Water Quality -- South Central Plains, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside Jan 1996

Regional Analysis Of Rural Domestic Well-Water Quality -- South Central Plains, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Analysis Of Rural Domestic Well-Water Quality -- Northern Panhandle Tablelands, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside Jan 1996

Regional Analysis Of Rural Domestic Well-Water Quality -- Northern Panhandle Tablelands, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Analysis Of Rural Domestic Well-Water Quality -- Republican River Valley And Dissected Plains, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside Jan 1996

Regional Analysis Of Rural Domestic Well-Water Quality -- Republican River Valley And Dissected Plains, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Analysis Of Rural Domestic Well-Water Quality -- North Central Tablelands, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside Jan 1996

Regional Analysis Of Rural Domestic Well-Water Quality -- North Central Tablelands, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- Platte River Valley, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside Jan 1996

Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- Platte River Valley, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- South Central Plains, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside Jan 1996

Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- South Central Plains, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- Northern Panhandle Tablelands, D. C. Gosselin, J. Headrick, X-H. Chen, S. E. Summerside Jan 1996

Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- Northern Panhandle Tablelands, D. C. Gosselin, J. Headrick, X-H. Chen, S. E. Summerside

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- Southwestern Tablelands, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside Jan 1996

Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- Southwestern Tablelands, D. C. Gosselin, J. Headrick, X- H. Chen, S. E. Summerside

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- Southern Panhandle Tablelands, D. C. Gosselin Jan 1996

Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- Southern Panhandle Tablelands, D. C. Gosselin

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- Republican River Valley And Dissected Plains, D. C. Gosselin, J. Headrick, X-H. Chen, S. E. Summerside Jan 1996

Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- Republican River Valley And Dissected Plains, D. C. Gosselin, J. Headrick, X-H. Chen, S. E. Summerside

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- East Central Dissected Plains, D. C. Gosselin, J. Headrick, X-H. Chen, S. E. Summerside Jan 1996

Regional Hydrogeologic Summaries From Domestic Well-Water Quality In Rural Nebraska -- East Central Dissected Plains, D. C. Gosselin, J. Headrick, X-H. Chen, S. E. Summerside

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Domestic Well-Water Quality In Rural Nebraska, D. C. Gosselin, J. Headrick, X. H. Chen, S. Summerside, R. Tremblay, K. Bottger Jan 1996

Domestic Well-Water Quality In Rural Nebraska, D. C. Gosselin, J. Headrick, X. H. Chen, S. Summerside, R. Tremblay, K. Bottger

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Data On Mineral Production In Nebraska, R. R. Burchett, D. Mohlman Jan 1996

Data On Mineral Production In Nebraska, R. R. Burchett, D. Mohlman

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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Upper Cretaceous Calcareous Nannofossil Biostratigraphy And Paleoceanography Of The Southern Ocean, David K. Watkins, Sherwood W. Wise Jr., James J. Popsichal, Jason Crux Jan 1996

Upper Cretaceous Calcareous Nannofossil Biostratigraphy And Paleoceanography Of The Southern Ocean, David K. Watkins, Sherwood W. Wise Jr., James J. Popsichal, Jason Crux

Department of Earth and Atmospheric Sciences: Faculty Publications

Nannofossil data from the Naturaliste Plateau (DSDP Legs 26 & 28), Falkland Plateau (DSDP Legs 36 & 71), Maud Rise (ODP Leg 113), Northeast Georgia Rise (ODP Leg 114), and Kerguelen Plateau (ODP Leg 120) yield a set of consistent, reliable biohorizons that form the basis of a revised calcareous nannofossil zonation for the Southern Ocean Upper Cretaceous. Analysis of this zonation indicates significant changes in the circum-Antarctic climatic regime during the Campanian and Maastrichtian that foreshadow the more dramatic climatic shifts of the Palaeogene. Calcareous nannofossils from the Turonian through the Lower Campanian of the studied sections are characterized …

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Estimation And Abundances In Two-Component Mineral Mixtures Using Mid-Infrared Laser Reflectance Ratios, Ram M. Narayanan, Kristin K. Warner, Robert F. Diffendal Jr. Jan 1996

Estimation And Abundances In Two-Component Mineral Mixtures Using Mid-Infrared Laser Reflectance Ratios, Ram M. Narayanan, Kristin K. Warner, Robert F. Diffendal Jr.

Department of Earth and Atmospheric Sciences: Faculty Publications

The mid-infrared spectral region (8-14 μm wavelength) is emerging as a viable geologic remote sensing tool due to the presence of reststrahlen bands for minerals such as silicates and carbonates. An experimental study was carried out to characterize the mid-infrared laser reflectance of mineral mixtures, and to explore the potential of laser remote sensing systems to estimate mineral abundances in two-component mixtures. An empirical model was developed to establish a relationship between laser reflectance ratios at judiciously selected wavelengths and percentage of one of the minerals in the mixture. It was found that the abundances can be estimated to within …

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Red Imported Fire Ant Impacts On Northern Bobwhite Populations, Craig R. Allen, R. Scott Lutz, Stephen Demarais Aug 1995

Red Imported Fire Ant Impacts On Northern Bobwhite Populations, Craig R. Allen, R. Scott Lutz, Stephen Demarais

United States Geological Survey: Staff Publications

The stability of Northern Bobwhite (Colinus virginianus) populations in Texas, where high density polygyne red imported fire ants (Solenopsis invicta) account for >50% of all (S. invicta) colonies, has been cited as a reason to repudiate impacts by this exotic species on Northern Bobwhite. We used two approaches to investigate the relationship between red imported fire ants and Northern Bobwhite. In the first approach, we used correlation analysis to compare Northern Bobwhite abundance trends, determined from Christmas Bird Count data in 15 Texas counties, before and after fire ant infestation. Before red imported fire …

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Deep-Well Data Base For Nebraska, Duane R. Mohlam, Raymond R. Burchett Aug 1995

Deep-Well Data Base For Nebraska, Duane R. Mohlam, Raymond R. Burchett

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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