The Quaternary thrust system of the northern Alaska Range
Sean P. Bemis, Gary A. Carver, Richard D. Koehler
2012, Geosphere (8) 196-205
The framework of Quaternary faults in Alaska remains poorly constrained. Recent studies in the Alaska Range north of the Denali fault add significantly to the recognition of Quaternary deformation in this active orogen. Faults and folds active during the Quaternary occur over a length of ∼500 km along the...
Estimating White-tailed Deer abundance at Gettysburg National Military Park and Eisenhower National Historic Site
David P. Stainbrook, Duane R. Diefenbach
2012, Natural Resource Technical Report NPS/NER/NRTR—2012/626
The mission at Gettysburg National Military Park and Eisenhower National Historic Site (GNMP-ENHS) is to preserve the historic character of the parks to enable current and future generations to understand and interpret the events that took place at each park. Management objectives include maintaining the landscape as it existed during...
Mauritania – A greenfields exploration opportunity in northwestern Africa
Cliff D. Taylor, E. D. Anderson, D. C. Bradley, G. Beaudoin, Michael A. Cosca, Robert G. Eppinger, Gregory L. Fernette, Carol A. Finn, Michael J. Friedel, Stuart A. Giles, Richard J. Goldfarb, John D. Horton, Gregory K. Lee, Erin E. Marsh, Jeffrey L. Mauk, Holly A. Motts, M. Y. Ould El Joud, S. Ould Soueidatt, A. Ould Taleb Mohamed, Barnaby W. Rockwell
2012, Society of Economic Geologists Newsletter (91) 14-18
No abstract available....
Communicating science: from cuneiform to the contemporary and beyond
Cecil A. Jennings
Cecil A. Jennings, Thomas E. Lauer, Bruce C. Vondracek, editor(s)
2012, Book chapter, Scientific Communication for Natural Resource Professionals
No abstract available....
Measuring rotational ground motions in seismological practice
William H. K. Lee, John R. Evans, B. S. Huang, C. R. Hutt, C.-J. Lin, C.-C. Liu, R. L. Nigbor
2012, Book chapter, New Manual of Seismological Observatory Practice 2 (NMSOP-2)
No abstract available....
Panarchy
Ahjond S. Garmestani, Craig R. Allen
Abdel H. El-Shaarawi, Walter W. Piegorsch, editor(s)
2012, Book chapter, Encyclopedia of environmetrics
Panarchy is the term coined to describe hierarchical systems where control is not only top down, as typically considered, but also bottom up. A panarchy is composed of adaptive cycles, and an adaptive cycle describes the processes of development and decay in a system. Complex systems self-organize into hierarchies because...
Illumination of rheological mantle heterogeneity by the M7.2 2010 El Mayor-Cucapah earthquake
Fred F. Pollitz, Roland Bürgmann, Wayne R. Thatcher
2012, Geochemistry, Geophysics, Geosystems (13)
Major intracontinental strike-slip faults tend to mark boundaries between lithospheric blocks of contrasting mechanical properties along much of their length. Both crustal and mantle heterogeneities can form such boundaries, but the role of crustal versus mantle strength contrasts for localizing strain sufficiently to generate major faults remains unclear. Using the...
Near‐surface void detection using a seismic landstreamer and horizontal velocity and attenuation tomography
Sean F. Buckley, John W. Lane Jr.
2012, Conference Paper, Symposium on the Application of Geophysics to Engineering and Environmental Problems 2012
The detection and characterization of subsurface voids plays an important role in the study of karst formations and clandestine tunnels. Horizontal velocity and attenuation tomography (HVAT) using offset‐fan shooting and a towed seismic land streamer is a simple, rapid, minimally invasive method that shows promise for detecting near‐surface voids and...
Recent thermal history influences thermal tolerance in freshwater mussel species (Bivalvia: Unionoida)
Heather S. Galbraith
2012, Freshwater Science (31) 83-92
Understanding species’ temperature tolerances in the context of concurrent environmental stressors is critical because thermal regimes of freshwater ecosystems are changing. We evaluated the critical thermal maximum (CTM) of 3 freshwater mussel species (Alasmidonta varicosa, Elliptio complanata, and Strophitus undulatus) acclimated to 2 temperatures (15 and 25°C) and exposed to...
Reaching toward the integration of research into resource management activities: A 20 year evaluation of Colorado Biennial Conferences
Martha E. Lee, Carena J. van Riper, Charles van Riper III, Gerard T. Kyle
Charles van Riper III, Miguel L. Villarreal, Carena J. van Riper, M. J. Johnson, editor(s)
2012, Book chapter, The Colorado Plateau V: Research, environmental planning, and management for collaborative conservation
No abstract available....
Reproductive endocrine disruption in smallmouth bass (Micropterus dolomieu) in the Potomac River basin: spatial and temporal comparisons of biological effects
Vicki Blazer, Luke R. Iwanowicz, Holly Henderson, Patricia M. Mazik, Jill A. Jenkins, David A. Alvarez, John A. Young
2012, Environmental Monitoring and Assessment (184) 4309-4334
A high prevalence of intersex or testicular oocytes (TO) in male smallmouth bass within the Potomac River drainage has raised concerns as to the health of the river. Studies were conducted to document biomarker responses both temporally and spatially to better understand the influence of normal physiological cycles, as well...
Climate-change-driven deterioration of water quality in a mineralized watershed
Andrew Todd, Andrew H. Manning, Philip L. Verplanck, Caitlin Crouch, Diane M. McKnight, Ryan Dunham
2012, Environmental Science & Technology (46) 9324-9332
A unique 30-year streamwater chemistry data set from a mineralized alpine watershed with naturally acidic, metal-rich water displays dissolved concentrations of Zn and other metals of ecological concern increasing by 100–400% (400–2000 μg/L) during low-flow months, when metal concentrations are highest. SO4 and other major ions show similar increases. A lack...
Solar thematic maps for space weather operations
E. Joshua Rigler, Steven M. Hill, Alysha A. Reinard, Robert A. Steenburgh
2012, Space Weather (10)
Thematic maps are arrays of labels, or "themes", associated with discrete locations in space and time. Borrowing heavily from the terrestrial remote sensing discipline, a numerical technique based on Bayes' theorem captures operational expertise in the form of trained theme statistics, then uses this to automatically assign labels to solar...
Effects of Bromus tectorum invasion on microbial carbon and nitrogen cycling in two adjacent undisturbed arid grassland communities
Sean M. Schaeffer, Susan E. Ziegler, Jayne Belnap, R.D. Evans
2012, Biogeochemistry (111) 427-441
Soil nitrogen (N) is an important component in maintaining ecosystem stability, and the introduction of non-native plants can alter N cycling by changing litter quality and quantity, nutrient uptake patterns, and soil food webs. Our goal was to determine the effects of Bromus tectorum (C3) invasion on soil microbial N...
Results of the first North American comparison of absolute gravimeters, NACAG-2010
David Schmerge, Olvier Francis, J. Henton, D. Ingles, D. Jones, Jeffrey R. Kennedy, K. Krauterbluth, J. Liard, D. Newell, R. Sands, J. Schiel, J. Silliker, D. van Westrum
2012, Journal of Geodesy (86) 591-596
The first North American Comparison of absolute gravimeters (NACAG-2010) was hosted by the National Oceanic and Atmospheric Administration at its newly renovated Table Mountain Geophysical Observatory (TMGO) north of Boulder, Colorado, in October 2010. NACAG-2010 and the renovation of TMGO are part of NGS’s GRAV-D project (Gravity for the Redefinition...
Over 100 years of environmental change recorded by foraminifers and sediments in a large Gulf of Mexico estuary, Mobile Bay, AL, USA
Lisa E. Osterman, Christopher G. Smith
2012, Estuarine and Continental Shelf Science (115) 345-358
The marine microfauna of Mobile Bay has been profoundly influenced by the development and expansion of the primary shipping channel over the last ∼100 years. Foraminifers and sediments from seven box cores with excess lead-210 chronology document that channel <a...
Ultra-high resolution four dimensional geodetic imaging of engineered structures for stability assessment
Gerald W. Bawden, Sandra Bond, J. H. Podoski, O. Kreylos, L. H. Kellogg
2012, Conference Paper, GeoCongress 2012
We used ground-based Tripod LiDAR (T-LiDAR) to assess the stability of two engineered structures: a bridge spanning the San Andreas fault following the M6.0 Parkfield earthquake in Central California and a newly built coastal breakwater located at the Kaumālapa`u Harbor Lana'i, Hawaii. In the 10 weeks following the earthquake, we...
Advances in carbonate exploration and reservoir analysis
J. Garland, J. Neilson, S.E. Laubach, Katherine J. Whidden
2012, Geological Society Special Publication (370) 1-15
The development of innovative techniques and concepts, and the emergence of new plays in carbonate rocks are creating a resurgence of oil and gas discoveries worldwide. The maturity of a basin and the application of exploration concepts have a fundamental influence on exploration strategies. Exploration success often occurs in underexplored...
The population structure of Escherichia coli isolated from subtropical and temperate soils
Muruleedhara N. Byappanahalli, Tao Yan, Matthew J. Hamilton, Satoshi Ishii, Roger S. Fujioka, Richard L. Whitman, Michael J. Sadowsky
2012, Science of the Total Environment (417-418) 273-279
While genotypically-distinct naturalized Escherichia coli strains have been shown to occur in riparian soils of Lake Michigan and Lake Superior watersheds, comparative analyses of E. coli populations in diverse soils across a range of geographic and climatic conditions have not been investigated. The main objectives of this study were to:...
Paired serologic and polymerase chain reaction analyses of avian influenza prevalence in Alaskan shorebirds
John M. Pearce, Daniel R. Ruthrauff, Jeffrey S. Hall
2012, Journal of Wildlife Diseases (48) 812-814
Surveillance has revealed low prevalence of avian influenza viruses (AIV) in shorebirds except Ruddy Turnstones (Arenaria interpres) on the North American Atlantic coast. Similarly, of five species of shorebirds surveyed in Alaska in 2010, Ruddy Turnstones had the highest AIV antibody prevalence; prevalence of AIV RNA was low or zero....
Mercury exposure may suppress baseline corticosterone levels in juvenile birds
Garth Herring, Joshua T. Ackerman, Mark P. Herzog
2012, Environmental Science & Technology (46) 6339-6346
Mercury exposure has been associated with a wide variety of negative reproductive responses in birds, however few studies have examined the potential for chick impairment via the hypothalamic-pituitary-adrenal (HPA) axis. The HPA axis regulates corticosterone levels during periods of stress. We examined the relationship between baseline fecal corticosterone metabolite concentrations...
Probabilistic Relationships between Ground‐Motion Parameters and Modified Mercalli Intensity in California
C.B. Worden, David J. Wald, D.A. Rhoades
2012, Bulletin of the Seismological Society of America (102) 204-221
We use a database of approximately 200,000 modified Mercalli intensity (MMI) observations of California earthquakes collected from USGS "Did You Feel It?" (DYFI) reports, along with a comparable number of peak ground-motion amplitudes from California seismic networks, to develop probabilistic relationships between MMI and peak ground velocity (PGV), peak ground...
Adding the ocean to the study of seabirds: A brief history of at-sea seabird research
David G. Ainley, Christine A. Ribic, Eric J. Woehler
2012, Marine Ecology Progress Series (451) 231-243
We review the history of how research directed towards marine ornithology has led to an appreciation of seabirds as highly specialized marine organisms. Beginning with R. C. Murphy (Pacific), V. C. Wynne-Edwards (Atlantic), and associates in the early 1900s, the research approach grew from an emphasis on seabird single-species ecology...
Upper Klamath Basin Landsat Image for July 25, 2006: Path 45 Rows 30 and 31
Daniel T. Snyder
2012, Report
This image is a mosaic of Landsat-5 images of the upper Klamath Basin. The original images were obtained from the U.S. Geological Survey Earth Resources Observation and Science Center (EROS). EROS is responsible for archive management and distribution of Landsat data products. The Landsat-5 satellite is part of an ongoing...
Nutrient and algal responses to winterkilled fish-derived nutrient subsidies in eutrophic lakes
Casey W. Schoenebeck, Michael L. Brown, Steven R. Chipps, David R. German
2012, Lake and Reservoir Management (28) 189-199
Fishes inhabiting shallow, glacial lakes of the Prairie Pothole Region in the United States and Canada periodically experience hypoxia in severe winters that can lead to extensive fish mortality resulting in high biomasses of dead fish. However, the role of carcass-derived nutrient subsidies in shallow, eutrophic lakes translocated to pelagic...
