Three-dimensional numerical model of ground-water flow in northern Utah Valley, Utah County, Utah
Philip M. Gardner
2009, Scientific Investigations Report 2008-5049
A three-dimensional, finite-difference, numerical model was developed to simulate ground-water flow in northern Utah Valley, Utah. The model includes expanded areal boundaries as compared to a previous ground-water flow model of the valley and incorporates more than 20 years of additional hydrologic data. The model boundary was generally expanded to...
The Iron Hill (Powderhorn) carbonatite complex, Gunnison County, Colorado — A potential source of several uncommon mineral resources
Bradley S. Van Gosen
2009, Open-File Report 2009-1005
A similar version of this slide show was presented on three occasions during 2008: two times to local chapters of the Society for Mining, Metallurgy, and Exploration (SME), as part of SME's Henry Krumb lecture series, and the third time at the Northwest Mining Association's 114th Annual Meeting, held December...
Summary of fluvial sediment collected at selected sites on the Gunnison River in Colorado and the Green and Duchesne Rivers in Utah, Water Years 2005-2008
Cory A. Williams, Steven J. Gerner, John G. Elliott
2009, Data Series 409
The Colorado River Basin provides habitat for 14 native fish, including four endangered species protected under the Federal Endangered Species Act of 1973 - Colorado pikeminnow (Ptychocheilus lucius), razorback sucker (Xyrauchen texanus), bonytail (Gila elegans), and humpback chub (Gila cypha). These endangered fish species once thrived in the Colorado River...
Geography of Alaska lake districts: Identification, description, and analysis of lake-rich regions of a diverse and dynamic state
Christopher D. Arp, Benjamin M. Jones
2009, Scientific Investigations Report 2008-5215
Lakes are abundant landforms and important ecosystems in Alaska, but are unevenly distributed on the landscape with expansive lake-poor regions and several lake-rich regions. Such lake-rich areas are termed lake districts and have landscape characteristics that can be considered distinctive in similar respects to mountain ranges. In this report, we...
Illuminating Northern California’s Active Faults
Carol S. Prentice, Christopher J. Crosby, Caroline S. Whitehill, J. Ramon Arrowsmith, Kevin P. Furlong, David A. Philips
2009, Eos, Transactions, American Geophysical Union (90) 55-55
Newly acquired light detection and ranging (lidar) topographic data provide a powerful community resource for the study of landforms associated with the plate boundary faults of northern California (Figure 1). In the spring of 2007, GeoEarthScope, a component of the EarthScope Facility construction project funded by the U.S. National Science...
Addressing geohazards through ocean drilling
J.K. Morgan, Eli Silver, Angelo Camerlenghi, Brandon Dugan, Stephen H. Kirby, Craig Shipp, Kiyoshi Suyehiro
2009, Scientific Drilling (7) 15-30
No abstract available. ...
Passerine bird trends at Hakalau Forest National Wildlife Refuge, Hawai‘i
Richard J. Camp, Thane K. Pratt, P. Marcos Gorresen, John J. Jeffrey, Bethany L. Woodworth
2009, Technical Report HCSU-011
Hakalau Forest National Wildlife Refuge, on the Island of Hawai‘i, was established in 1985 to protect native forest birds, particularly endangered species. Management actions on the 15,400 ha refuge include removing feral ungulates from the forest and pastures, controlling invasive alien plants, reforesting pastures, and supplementing endangered plant populations. To...
Why are diverse relationships observed between phytoplankton biomass and transport time?
Lisa V. Lucas, Janet K. Thompson, Larry R. Brown
2009, Limnology and Oceanography (54) 381-390
Transport time scales such as flushing time and residence time are often used to explain variability in phytoplankton biomass. In many cases, empirical data are consistent with a positive phytoplankton‐transport time relationship (i.e., phytoplankton biomass increases as transport time increases). However, negative relationships, varying relationships, or no significant relationship may...
Nutrient dynamics
Gene E. Likens, James W. LaBaugh, Donald C. Buso, Darren Bade
Thomas C. Winter, Gene E. Likens, editor(s)
2009, Book chapter, Mirror Lake: Interactions among air, land, and water
This chapter focuses on the variability and trends in chemical concentrations and fluxes at Mirror Lake during the period 1981–2000. It examines the water and chemical budgets of Mirror Lake to identify and understand better long-term trends in the chemical characteristics of the lake. It also identifies the causes of...
Effects of fish size, habitat, flow, and density on capture probabilities of age-0 rainbow trout estimated from electrofishing at discrete sites in a large river
Josh Korman, Michael D. Yard, Carl Walters, Lewis G. Coggins
2009, Transactions of American Fisheries Society 58-75
We estimated size-specific capture probabilities of age-0 rainbow trout Oncorhynchus mykiss in the Lee's Ferry Reach of the Colorado River, Arizona, by backpack and boat electrofishing at discrete shoreline sites using both depletion and mark-recapture experiments. Our objectives were to evaluate the feasibility of estimating capture probability for juvenile fish in larger...
Radiocarbon ages and age models for the past 30,000 years in Bear Lake, Utah and Idaho
Steve M. Colman, Robert J. Rosenbauer, Darrell Kaufman, Walter E. Dean, John McGeehin
2009, GSA Special Papers (450) 133-144
Radiocarbon analyses of pollen, ostracodes, and total organic carbon (TOC) provide a reliable chronology for the sediments deposited in Bear Lake over the past 30,000 years. The differences in apparent age between TOC, pollen, and carbonate fractions are consistent and in accord with the origins of these fractions. Comparisons among...
Comparison of groundwater flow in Southern California coastal aquifers
Randall T. Hanson, John A. Izbicki, Eric G. Reichard, Brian D. Edwards, Michael Land, Peter Martin
2009, Book chapter, Earth science in the urban ocean: The Southern California continental borderland
Development of the coastal aquifer systems of Southern California has resulted in overdraft, changes in streamflow, seawater intrusion, land subsidence, increased vertical flow between aquifers, and a redirection of regional flow toward pumping centers. These water-management challenges can be more effectively addressed by incorporating new understanding of the geologic,...
Surface deformation analysis of the Mauna Loa and Kīlauea volcanoes, Hawai‘i, based on InSAR displacement time series
F. Casu, G. Solaro, Pietro Tizzani, Michael P. Poland, Asta Miklius, Eugenio Sansosti, Riccardo Lanari
2009, Conference Paper, IEEE Conference Publications Program
We investigate the deformation of Mauna Loa and Kilauea volcanoes, Hawai`i, by exploiting the advanced differential Synthetic Aperture Radar Interferometry (InSAR) technique referred to as the Small BAseline Subset (SBAS) algorithm. In particular, we present time series of line-of-sight (LOS) displacements derived from SAR data acquired by the ASAR instrument,...
Interacción termal entre magmas graníticos laramídicos y rocas encajonantes mesoproterozoicas: Historia de enfriamiento de intrusivos de la sierrita blanca, NW Sonora
Monica A. Enriquez-Castillo, Alexander Iriondo, Gabriel Chavez-Cabello, Michael J. Kunk
2009, Boletin de la Sociedad Geologica Mexicana (61) 451-483
A semi-quantitative thermochronological study, combining U-Pb and 40Ar/39Ar geochronology, has allowed assessment of the crystallization and cooling history of the Laramide Sierrita Blanca granite as well as the thermal effects resulting from the intrusion into the Mesoproterozoic host rocks (~1.1 Ga Murrieta granite). The U-Pb zircon age discrepancy between two samples...
Quaternary incision rates and drainage evolution of the Uncompahgre and Gunnison Rivers, western Colorado, as calibrated by the Lava Creek B ash
Andrew L. Darling, Karl E. Karlstrom, Andres Aslan, Rex D. Cole, Charles Betton, Elmira Wan
2009, Rocky Mountain Geology (44) 71-83
The Quaternary erosional history of western Colorado is documented in terraces of the Colorado, Gunnison, and Uncompahgre Rivers that contain the Lava Creek B ash (0.64 Ma). This paper reports an important new ash locality that dates ca. 100-m-high river gravels associated with the paleo-confluence of the Gunnison and Uncompahgre...
Description and Analytical Results for Deposited Dust Samples from a Two-Year Monitoring Program Near Deer Trail, Colorado, USA, 2006-2007
Marith C. Reheis, Jeffrey S. Honke, Paul Lamothe, Eric Fisher
2009, Open-File Report 2008-1361
Biosolids reclaimed from municipal wastewater have been applied since 1993 on nonirrigated farmland and rangeland east of Deer Trail, Colo., by Metro Wastewater Reclamation District of Denver. The U.S. Geological Survey has monitored ground water at this site since 1993, and began monitoring the biosolids, soils, and stream sediments in...
New substorm index derived from high-resolution geomagnetic field data at low latitude and its comparison with AE and ASY indices
M. Nose, T. Iyemori, M. Takeda, H. Toh, T. Ookawa, G. Cifuentes-Nava, J. Matzka, Jeffrey J. Love, H. McCreadie, M. K. Tuncer, J. J. Curto
2009, Conference Paper, Proc. XIII IAGA Workshop
High-resolution geomagnetic field data (i.e., ≤5 seconds) have recently become more commonly used by space physicists. The data permit the identification of Pi2 pulsations, having periods of 40-150 seconds and irregular waveforms. Pulsations of this type appear clearly in time series from mid- and low-latitude ground stations on the nightside...
Aeromicrobiology/air quality
Gary L. Andersen, A.S. Frisch, Christina A. Kellogg, E. Levetin, Bruce Lighthart, D. Paterno
2009, Book chapter, Encyclopedia of Microbiology
The most prevalent microorganisms, viruses, bacteria, and fungi, are introduced into the atmosphere from many anthropogenic sources such as agricultural, industrial and urban activities, termed microbial air pollution (MAP), and natural sources. These include soil, vegetation, and ocean surfaces that have been disturbed by atmospheric turbulence. The airborne concentrations range...
Absolute Measurement Session XIII IAGA Workshop Boulder Magnetic Observatory
A. Berarducci, Andy Woods
2009, Conference Paper, XIII IAGA Workshop
The absolute measurement session of the XIII IAGA Workshop was held at the Boulder Magnetic Observatory June 10-13, 2008. Approximately 85 people attended this session. The main focus of the session was for observers to make and compare measurements using DIFlux magnetometers. The session also included absolute measurement training, with...
Calibrating biomonitors to ecological disturbance: a new technique for explaining metal effects in natural waters
Samuel N. Luoma, Daniel J. Cain, Philip S. Rainbow
2009, Integrated Environmental Assessment and Management (6) 199-209
Bioaccumulated toxic metals in tolerant biomonitors are indicators of metal bioavailability and can be calibrated against metal‐specific responses in sensitive species, thus creating a tool for defining dose–response for metals in a field setting. Dose–response curves that define metal toxicity in natural waters are rare. Demonstrating cause and effect under...
Movement triggers and remediation in a fracture-dominated translational landslide at the Oregon coast
George R. Priest, Jonathan Allan, Alan Niem, Wendy A. Niem, Stephen E. Dickenson
2009, Book
The Johnson Creek landslide is a translational slide in seaward dipping Miocene siltstone and sandstone (Astoria Formation) and an overlying Quaternary marine terrace deposit. The slide terminates in a sea cliff and has a hummocky to nearly horizontal ground surface. The basal slide plane, however, slopes subparallel to the dip...
Optical satellite data volcano monitoring: a multi-sensor rapid response system
Kenneth A. Duda, Michael Ramsey, Rick L. Wessels, Jonathan Dehn
2009, Book chapter, Geoscience and remote sensing
In this chapter, the use of satellite remote sensing to monitor active geological processes is described. Specifically, threats posed by volcanic eruptions are briefly outlined, and essential monitoring requirements are discussed. As an application example, a collaborative, multi-agency operational volcano monitoring system in the north Pacific is highlighted with a...
Missing data and the accuracy of magnetic-observatory hour means
Jeffrey J. Love
2009, Annales Geophysicae (27) 3601-3610
Analysis is made of the accuracy of magnetic-observatory hourly means constructed from definitive minute data having missing values (gaps). Bootstrap sampling from different data-gap distributions is used to estimate average errors on hourly means as a function of the number of missing data. Absolute and relative error results are calculated...
A standardized response to biological invasions
Irfan Rashid, Gyan Prakash Sharma, Karen J. Esler, Zafar A. Reshi, Anzar A. Khuroo, Annie Simpson
2009, Science (325) 146-146
The Policy Forum “Will threat of biological invasions unite the European Union?” (P. E. Hulme et al., 3 April, p. 40) emphasized the major regulatory and political challenges faced by European institutions. However, they are not alone in facing the tremendous threat of biological invasions; this is a global challenge...
Fire rehabilitation effectiveness: a chronosequence approach for the Great Basin
David A. Pyke, David S. Pilliod, Jeanne C. Chambers, Matthew L. Brooks, James Grace
2009, Report
Federal land management agencies have invested heavily in seeding vegetation for emergency stabilization and rehabilitation (ES&R) of non-forested lands. ES&R projects are implemented to reduce post-fire dominance of non-native annual grasses, minimize probability of recurrent fire, quickly recover lost habitat for sensitive species, and ultimately result in plant communities with...
