Aftershocks halted by static stress shadows
Shinji Toda, Ross S. Stein, Gregory C. Beroza, David Marsan
2012, Nature Geoscience (5) 410-413
Earthquakes impart static and dynamic stress changes to the surrounding crust. Sudden fault slip causes small but permanent—static—stress changes, and passing seismic waves cause large, but brief and oscillatory—dynamic—stress changes. Because both static and dynamic stresses can trigger earthquakes within several rupture dimensions of a mainshock, it has proven difficult...
Status of pelagic prey fishes in Lake Michigan, 2012
David M. Warner, Timothy P. O’Brien, Steve A. Farha, Randall M. Claramunt, Dale Hanson
2012, Report
Acoustic surveys were conducted in late summer/early fall during the years 1992-1996 and 2001-2012 to estimate pelagic prey fish biomass in Lake Michigan. Midwater trawling during the surveys as well as target strength provided a measure of species and size composition of the fish community for use in scaling acoustic...
Status and trends of prey fish populations in Lake Michigan, 2012
David B. Bunnell, Charles P. Madenjian, Timothy J. Desorcie, Melissa Jean Kostich, Kelley Smith, Jean V. Adams
2012, Report
The U.S. Geological Survey Great Lakes Science Center has conducted lake-wide surveys of the fish community in Lake Michigan each fall since 1973 using standard 12-m bottom trawls towed along contour at depths of 9 to 110 m at each of seven index transects. The resulting data on relative abundance,...
A program for handling map projections of small-scale geospatial raster data
Michael P. Finn, Daniel R. Steinwand, Jason R. Trent, Robert A. Buehler, David M. Mattli, Kristina H. Yamamoto
2012, Cartographic Perspectives (71) 53-67
Scientists routinely accomplish small-scale geospatial modeling using raster datasets of global extent. Such use often requires the projection of global raster datasets onto a map or the reprojection from a given map projection associated with a dataset. The distortion characteristics of these projection transformations can have significant effects on modeling...
Sexual selection and mating chronology of Lesser Prairie-Chickens
Adam C. Behney, Blake A. Grisham, Clint W. Boal, Heather A. Whitlaw, David A. Haukos
2012, Wilson Journal of Ornithology (124) 96-105
Little is known about mate selection and lek dynamics of Lesser Prairie-Chickens (Tympanuchus pallidicinctus). We collected data on male territory size and location on leks, behavior, and morphological characteristics and assessed the importance of these variables on male Lesser Prairie-Chicken mating success during spring 2008 and 2009 in the Texas...
Provisioning of nestling Dickcissels in native warm-season grass field buffers
K. L. Mitchell, Samuel K. Riffell, L. Wes Burger Jr., Francisco Vilella
2012, Wilson Journal of Ornithology (124) 298-309
We used video cameras in 2008–2009 to record provisioning activities at Dickcissel (Spiza americana) nests in and around Conservation Reserve Program field buffers in north-central Mississippi, USA. We simultaneously observed foraging flight distances of parents. Provisioning rate (P = 0.412), biomass (P = 0.161), and foraging distance (P = 0.159)...
Establishment of sentinel sampling sites to monitor changes in water and sediment quality and biota related to visitor use at Lake Powell, Arizona and Utah, 2004-2006
Robert J. Hart, Howard E. Taylor, G.M. Anderson
2012, Open-File Report 2012-1237
Twenty sentinel sampling sites were established and sampled during 2004–06 at Lake Powell, Arizona and Utah, by the U.S. Geological Survey and the National Park Service—Glen Canyon National Recreation Area. The sentinel sampling sites provide sampling locations on Lake Powell, the Nation’s second largest reservoir that can be visited and...
Long-term impacts of invasive species on a native top predator in a large lake system
Scott A. Rush, Gordon Paterson, Tim B. Johnson, Ken G. Drouillard, Gordon D. Haffner, Craig E. Hebert, Michael T. Arts, Daryl J. McGoldrick, Sean M. Backus, Brian F. Lantry, Jana R. Lantry, Ted Schaner, Aaron T. Fisk
2012, Freshwater Biology (57) 2342-2355
1. Declining abundances of forage fish and the introduction and establishment of non-indigenous species have the potential to substantially alter resource and habitat exploitation by top predators in large lakes. 2. We measured stable isotopes of carbon (δ13C) and nitrogen (δ15N) in field-collected and archived samples of Lake Ontario lake trout (Salvelinus...
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?
Victoria E. Langenheim, Tammy L. Surko, Phillip A. Armstrong, Jonathan C. Matti
2012, Conference Paper, Searching for the Pliocene: southern exposures, Annual Desert Symposium Proceedings
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...
Observed source parameters for dynamic rupture with non-uniform initial stressand relatively high fracture energy
Nicholas M. Beeler, Brian D. Kilgore, Arthur F. McGarr, Jon Peter B. Fletcher, John R. Evans, Steven R. Baker
2012, Journal of Structural Geology (38) 77-89
We have conducted dynamic rupture propagation experiments to establish the relations between in-source stress drop, fracture energy and the resulting particle velocity during slip of an unconfined 2 m long laboratory fault at normal stresses between 4 and 8 MPa. To produce high fracture energy in the source we use a...
Dzhezkazgan and associated sandstone copper deposits of the Chu-Sarysu basin, Central Kazakhstan
Stephen E. Box, Reimar Seltmann, Michael L. Zientek, Boris Syusyura, Robert A. Creaser, Alla Dolgopolova
2012, Book chapter, Society of Economic Geologists Special Publication
Sandstone-hosted copper (sandstone Cu) deposits occur within a 200-km reach of the northern Chu-Sarysu basin of central Kazakhstan (Dzhezkazgan and Zhaman-Aibat deposits, and the Zhilandy group of deposits). The deposits consist of Cu sulfide minerals as intergranular cement and grain replacement...
Ecological impacts of non-native species
David S. Pilliod, R.A. Griffiths, S.L. Kuzmin
Harold Heatwole, John W. Wilkinson, editor(s)
2012, Book chapter, Conservation and decline of amphibians: Ecological aspects, effect of humans, and management
Non-native species are considered one of the greatest threats to freshwater biodiversity worldwide (Drake et al. 1989; Allen and Flecker 1993; Dudgeon et al. 2005). Some of the first hypotheses proposed to explain global patterns of amphibian declines included the effects of non-native species (Barinaga 1990; Blaustein and Wake 1990;...
Loss and modification of habitat
Francis Lemckert, Stephen Hecnar, David S. Pilliod
2012, Book chapter, Conservation and decline of amphibians: Ecological aspects, effect of humans, and management
Amphibians live in a wide variety of habitats around the world, many of which have been modified or destroyed by human activities. Most species have unique life history characteristics adapted to specific climates, habitats (e.g., lentic, lotic, terrestrial, arboreal, fossorial, amphibious), and local conditions that provide suitable areas for reproduction,...
Stochastic analyses to identify wellfield withdrawal effects on surface-water and groundwater in Miami-Dade County, Florida
Eric Swain
2012, Journal of Environmental Management (113) 15-21
Several stochastic analyses were conducted in Miami-Dade County, Florida, to evaluate the effects of wellfield withdrawal on aquifer water levels, canal stage, and canal flow. Multiyear data for withdrawals at four water-supply wellfields, water levels at the S-121 canal control structure and groundwater head at a nearby monitoring well were used to determine...
Summary of the geology of the northern part of the Sierra Cuchillo, Socorro and Sierra Counties, southwestern New Mexico
Florian Maldonado
Spencer G. Lucas, Virginia T. McLemore, Virgil W. Lueth, Justin A. Spielmann, Karl Krainer, editor(s)
2012, Conference Paper, New Mexico Geological Society Fall Field Conference Guidebook - 63 Geology of the Warm Springs Region
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...
Acanthocephalan parasites of slimy sculpin, Cottus cognatus, and Ninespine Stickleback, Pungitius pungitius, from Lake Michigan, U.S.A.
Patrick M. Muzzall, Michael Lima, Alex Gentile, Jacob Gunn, Amanda Jones, Jamie Morrison, John R. P. French III
2012, Comparative Parasitology (79) 15-22
In total, 288 slimy sculpins, Cottus cognatus, were collected in September 2003 from 6 Lake Michigan, U.S.A., ports, along with 220 ninespine sticklebacks, Pungitius pungitius, from 3 ports. The ports included Waukegan, Illinois; Port Washington (PW) and Sturgeon Bay (SB), Wisconsin; and Manistique (MS), Frankfort (FF), Ludington (LD), and Saugatuck,...
Successional change in the Lake Superior fish community: Population trends in ciscoes, rainbow smelt, and lake trout, 1958-2008
Owen T. Gorman
2012, Advances in Limnology (63) 337-362
The Lake Superior fish community underwent massive changes in the second half of the 20th century. Those changes are largely reflected in changes in abundance of the adults of principal prey species, the ciscoes (Coregonus spp.), the invasive rainbow smelt (Osmerus mordax), and the principal predator, lake trout (Salvelinus namaycush)....
Landsat 4 Thematic Mapper calibration update
Dennis L. Helder, Rimy Malla, Cory J. Mettler, Brian L. Markham, Esad Micijevic
2012, IEEE Transactions on Geoscience and Remote Sensing (50) 2400-2408
The Landsat 4 Thematic Mapper (TM) collected imagery of the Earth's surface from 1982 to 1993. Although largely overshadowed by Landsat 5 which was launched in 1984, Landsat 4 TM imagery extends the TM-based record of the Earth back to 1982 and also substantially supplements the image archive collected by...
Seasonal zooplankton dynamics in Lake Michigan: disentangling impacts of resource limitation, ecosystem engineering, and predation during a critical ecosystem transition
Henry A. Vanderploeg, Steven A. Pothoven, Gary L. Fahnenstiel, Joann F. Cavaletto, James R. Liebig, Craig Stow Stow, Thomas F. Nalepa, Charles P. Madenjian, David B. Bunnell
2012, Journal of Great Lakes Research (38) 336-352
We examined seasonal dynamics of zooplankton at an offshore station in Lake Michigan from 1994 to 2003 and 2007 to 2008. This period saw variable weather, declines in planktivorous fish abundance, the introduction and expansion of dreissenid mussels, and a slow decline in total phosphorus concentrations. After the major expansion...
Floods of June 2012 in northeastern Minnesota
Christiana R. Czuba, James D. Fallon, Erich W. Kessler
2012, Scientific Investigations Report 2012-5283
During June 19–20, 2012, heavy rainfall, as much as 10 inches locally reported, caused severe flooding across northeastern Minnesota. The floods were exacerbated by wet antecedent conditions from a relatively rainy spring, with May 2012 as one of the wettest Mays on record in Duluth. The June 19–20, 2012, rainfall...
Assessing potential effects of changes in water use with a numerical groundwater-flow model of Carson Valley, Douglas County, Nevada, and Alpine County, California
Richard M. Yager, Douglas K. Maurer, C.J. Mayers
2012, Scientific Investigations Report 2012-5262
Rapid growth and development within Carson Valley in Douglas County, Nevada, and Alpine County, California, has caused concern over the continued availability of groundwater, and whether the increased municipal demand could either impact the availability of water or result in decreased flow in the Carson River. Annual pumpage of groundwater...
North Central Climate Science Center--science agenda 2012-2017
Jeffrey T. Morisette
2012, Open-File Report 2012-1265
The information presented here provides the five-year science agenda for the North Central Climate Science Center. It is meant to be a high-level guide that describes the spatial context of the center, the primary partners and stakeholders, and the strategic framework the center will use in applying climate science to...
Borehole geophysical, fluid, and hydraulic properties within and surrounding the freshwater/saline-water transition zone, San Antonio segment of the Edwards aquifer, south-central Texas, 2010-11
Jonathan V. Thomas, Gregory P. Stanton, Rebecca B. Lambert
2012, Scientific Investigations Report 2012-5285
The freshwater zone of the San Antonio segment of the Edwards aquifer is used by residents of San Antonio and numerous other rapidly growing communities in south-central Texas as their primary water supply source. This freshwater zone is bounded to the south and southeast by a saline-water zone with an...
Vegetation, substrate, and eolian sediment transport at Teesto Wash, Navajo Nation, 2009-2012
Amy E. Draut, Margaret Hiza Redsteer, Lee Amoroso
2012, Scientific Investigations Report 2012-5095
On the Navajo Nation, southwestern United States, warming temperatures and recent drought have increased eolian (windblown) sediment mobility such that large, migrating sand dunes affect grazing lands, housing, and road access. We present an assessment of seasonal variations in sand transport, mobility, and ground cover (vegetation and substrate) within a...
Stratigraphic cross section of measured sections and drill holes of the Neslen Formation and adjacent formations, Book Cliffs Area, Colorado and Utah
Mark A. Kirschbaum, Brianne D. Spear
2012, Open-File Report 2012-1260
This study updates a stratigraphic cross section published as plate 2 in Kirschbaum and Hettinger (2004) Digital Data Series 69-G (http://pubs.usgs.gov/dds/dds-069/dds-069-g/). The datum is a marine/tidal ravinement surface within the Cozzette Sandstone Member of the Iles Formation and the Thompson Canyon Sandstone and Sulphur Canyon Sandstone Beds of...
