Conference Papers
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Proterozoic to Cenozoic geology above, within and beneath the Blue Ridge Composite Thrust Sheet as exposed along the Blue Ridge Parkway in the Peaks of Otter region, central Virginia Blue Ridge: Guidebook for the 43rd Annual Virginia Geological Field Con
No abstract available.
Authors
Mark W. Carter, C. Scott Southworth, John N. Aleinikoff
Status and trends of pelagic prey fishes in Lake Huron, 2012
The USGS Great Lakes Science Center (GLSC) conducted acoustic/midwater trawl surveys of Lake Huron during 1997 and annually during 2004-2012. The 2012 survey was conducted during September and October, and included transects in Lake Huron’s Main Basin, Georgian Bay, and North Channel. Pelagic fish density (638 fish/ha) was lower in 2012 compared to 2011, with density in 2012 only 34% of 2011. Tota
Authors
David M. Warner, Timothy P. O'Brien, Steve A. Farha, Jeff Schaeffer, Stephen Lenart
The distribution of lingering subsurface oil from the Exxon Valdez oil spill
This study used field data and a suite of geospatial models to identify areas where subsurface oil is likely to still be present on the shorelines of Prince William Sound (PWS) and the Gulf of Alaska (GOA) affected by the Exxon Valdez oil spill, as well as the factors related to continued presence of such oil. The goal was to identify factors and accompanying models that could serve as screening t
Unraveling Alleghanian orogenesis in southern Connecticut: The history of the Lyme Dome
No abstract available.
Authors
Gregory J. Walsh, John N. Aleinikoff, Robert P. Wintsch
Basin thickness variations at the Junction of the Eastern California Shear Zone and the San Bernardino Mountains, California: How thick could the Pliocene sections be?
We estimate the thickness of Neogene basin fill along the junction of the Eastern
California Shear Zone and the North Frontal thrust system of the San Bernardino Mountains
using gravity data with geologic and well log constraints. The geometry of the basin fill is of
interest for groundwater assessment and location of potential faults, as well as providing an upper
bound on the thickness of any po
Authors
Victoria E. Langenheim, Tammy L. Surko, Phillip A. Armstrong, Jonathan C. Matti
Using computational modeling of river flow with remotely sensed data to infer channel bathymetry
As part of an ongoing investigation into the use of computational river flow and morphodynamic models for the purpose of correcting and extending remotely sensed river datasets, a simple method for inferring channel bathymetry is developed and discussed. The method is based on an inversion of the equations expressing conservation of mass and momentum to develop equations that can be solved for dep
Authors
Jonathan M. Nelson, Richard R. McDonald, Paul J. Kinzel, Y. Shimizu
Summary of the geology of the northern part of the Sierra Cuchillo, Socorro and Sierra Counties, southwestern New Mexico
The northern part of the Sierra Cuchillo is located within the northeastern part of the Mogollon-Datil volcanic field west of the Rio Grande rift in the Basin and Range Province, approximately 50 km northwest of Truth or Consequences in south-central New Mexico. The Sierra Cuchillo is a north-south, elongated horst block composed of Tertiary volcanic and intrusive rocks, sparse outcrops of Lower P
Authors
Florian Maldonado
Redox reaction rates in shallow aquifers: Implications for nitrate transport in groundwater and streams
Groundwater age and water chemistry data along flow paths from recharge areas to streams were used to evaluate the trends and transformations of agricultural chemicals. Results from this analysis indicate that median nitrate recharge concentrations in these agricultural areas have increased markedly over the last 50 years from 4 mg N/L in samples collected prior to 1983 to 7.5 mg N/L in samples co
Authors
Anthony J. Tesoriero
Canada Basin revealed
More than 15,000 line-km of new regional seismic reflection and refraction data in the western Arctic Ocean provide insights into the tectonic and sedimentologic history of Canada Basin, permitting development of new geologic understanding in one of Earth's last frontiers. These new data support a rotational opening model for southern Canada Basin. There is a central basement ridge possibly repres
Authors
David C. Mosher, John Shimeld, Deborah R. Hutchinson, D Chian, Nina Lebedeva-Ivanova, Ruth Jackson
3-D reconstructions of subsurface Pleistocene basalt flows from paleomagnetic inclination data and 40Ar/39Ar ages in the southern part of the Idaho National Laboratory (INL), Idaho (USA)
The U. S. Geological Survey, in cooperation with the U.S. Department of Energy, is mapping the distribution of basalt flows and sedimentary interbeds at the Idaho National Laboratory in three dimensions to provide data for refining numerical models of groundwater flow and contaminant transport in the eastern Snake River Plain aquifer. Paleomagnetic inclination and polarity data from basalt samples
Authors
Mary K. V. Hodges, Duane E. Champion, B.D. Turrin, C. C. Swisher
Application of Wind Fetch and Wave Models for Habitat Rehabilitation and Enhancement Projects
Models based upon coastal engineering equations have been developed to quantify wind fetch length and several physical wave characteristics including significant height, length, peak period, maximum orbital velocity, and shear stress. These models were used to quantify differences in proposed island construction designs for three Habitat Rehabilitation and Enhancement Projects (HREPs) in the U.S.
Authors
Jason J. Rohweder, James T. Rogala, Barry L. Johnson, Dennis Anderson, Steve Clark, Ferris Chamberlin
Bioenergy potential of the United States constrained by satellite observations of existing productivity
Background/Question/Methods
Currently, the United States (U.S.) supplies roughly half the world’s biofuel (secondary bioenergy), with the Energy Independence and Security Act of 2007 (EISA) stipulating an additional three-fold increase in annual production by 2022. Implicit in such energy targets is an associated increase in annual biomass demand (primary bioenergy) from roughly 2.9 to 7.4 exajou
Authors
Sasha C. Reed, William K. Smith, Cory C. Cleveland, Norman L. Miller, Steven W. Running