Quantifying probabilities of volcanic events: The example of volcanic hazard at Mount Vesuvius
W. Marzocchi, L. Sandri, P. Gasparini, C. Newhall, Enzo Boschi
2004, Journal of Geophysical Research B: Solid Earth (109) 1-18
We describe an event tree scheme to quantitatively estimate both long- and short-term volcanic hazard. The procedure is based on a Bayesian approach that produces a probability estimation of any possible event in which we are interested and can make use of all available information including theoretical models, historical and...
A physical model for strain accumulation in the San Francisco Bay region: Stress evolution since 1838
F. Pollitz, W. H. Bakun, M. Nyst
2004, Journal of Geophysical Research B: Solid Earth (109) 1-16
Understanding of the behavior of plate boundary zones has progressed to the point where reasonably comprehensive physical models can predict their evolution. The San Andreas fault system in the San Francisco Bay region (SFBR) is dominated by a few major faults whose behavior over about one earthquake cycle is fairly...
Dynamic modelling of an adsorption storage tank using a hybrid approach combining computational fluid dynamics and process simulation
J.P.B. Mota, I.A.A.C. Esteves, M. Rostam-Abadi
2004, Computers and Chemical Engineering (28) 2421-2431
A computational fluid dynamics (CFD) software package has been coupled with the dynamic process simulator of an adsorption storage tank for methane fuelled vehicles. The two solvers run as independent processes and handle non-overlapping portions of the computational domain. The codes exchange data on the boundary interface of the two...
Mapping of the Culann-Tohil region of Io from Galileo imaging data
D.A. Williams, Paul M. Schenk, Jeffrey M. Moore, Laszlo P. Keszthelyi, Elizabeth P. Turtle, Windy L. Jaeger, Jani Radebaugh, Moses P. Milazzo, Rosaly Lopes, Ronald Greeley
2004, Icarus (169) 80-97
We have used Galileo spacecraft data to produce a geomorphologic map of the Culann–Tohil region of Io's antijovian hemisphere. This region includes a newly discovered shield volcano, Tsũi Goab Tholus and a neighboring bright flow field, Tsũi Goab Fluctus, the active Culann Patera and the enigmatic Tohil Mons-Radegast Patera–Tohil Patera complex. Analysis...
Temporal and spatial estimates of adult striped bass mortality from telemetry and transmitter return data
S.P. Young, J. Jeffery Isely
2004, North American Journal of Fisheries Management (24) 1112-1119
Estimates of total mortality, fishing mortality, and natural mortality in the fishery for the adult striped bass Morone saxatilis in J. Strom Thurmond Reservoir, South Carolina-Georgia, were determined from long-term radiotelemetry data and high-reward radio transmitter return data using catch curve analyses. Annual total mortality rates were 0.81 ?? 0.06...
Siberia snow depth climatology derived from SSM/I data using a combined dynamic and static algorithm
M. Grippa, N. Mognard, Toan T. Le, E.G. Josberger
2004, Remote Sensing of Environment (93) 30-41
One of the major challenges in determining snow depth (SD) from passive microwave measurements is to take into account the spatiotemporal variations of the snow grain size. Static algorithms based on a constant snow grain size cannot provide accurate estimates of snow pack thickness, particularly over large regions where the...
VEMAP Phase 2 bioclimatic database. I. Gridded historical (20th century) climate for modeling ecosystem dynamics across the conterminous USA
T.G.F. Kittel, N.A. Rosenbloom, J. Andrew Royle, Christopher Daly, W.P. Gibson, H.H. Fisher, P. Thornton, D.N. Yates, S. Aulenbach, C. Kaufman, R. McKeown, D. Bachelet, D. S. Schimel, R. Neilson, J. Lenihan, R. Drapek, D.S. Ojima, W.J. Parton, J. M. Melillo, D. W. Kicklighter, H. Tian, A. D. McGuire, M.T. Sykes, B. Smith, S. Cowling, T. Hickler, I. C. Prentice, S. Running, K.A. Hibbard, W.M. Post, A.W. King, T. Smith, B. Rizzo, F.I. Woodward
2004, Climate Research (27) 151-170
Analysis and simulation of biospheric responses to historical forcing require surface climate data that capture those aspects of climate that control ecological processes, including key spatial gradients and modes of temporal variability. We developed a multivariate, gridded historical climate dataset for the conterminous USA as a common input database for...
Re-Os sulfide geochronology of the Red Dog sediment-hosted Zn-Pb-Ag deposit, Brooks Range, Alaska
R.M. Morelli, R.A. Creaser, D. Selby, K.D. Kelley, D. L. Leach, A.R. King
2004, Economic Geology (99) 1569-1576
The Red Dog sediment-hosted deposit in the De Long Mountains of northern Alaska is the largest Zn producer in the world. Main stage mineralization is characterized by massive sulfide ore and crosscutting subvertical veins. Although the vein mineralization is clearly younger than the massive ore, the exact temporal relationship between...
Petroleum generation and migration in the Mesopotamian Basin and Zagros Fold Felt of Iraq: Results from a basin-modeling study
Janet K. Pitman, D. Steinshouer, M. D. Lewan
2004, GeoArabia (9) 41-72
A regional 3-D total petroleum-system model was developed to evaluate petroleum generation and migration histories in the Mesopotamian Basin and Zagros fold belt in Iraq. The modeling was undertaken in conjunction with Middle East petroleum assessment studies conducted by the USGS. Regional structure maps, isopach and facies maps, and thermal...
Estimation of hydraulic conductivity in an alluvial system using temperatures
G.W. Su, James Jasperse, D. Seymour, J. Constantz
2004, Ground Water (42) 890-901
Well water temperatures are often collected simultaneously with water levels; however, temperature data are generally considered only as a water quality parameter and are not utilized as an environmental tracer. In this paper, water levels and seasonal temperatures are used to estimate hydraulic conductivities in a stream-aquifer system. To demonstrate...
Multi-scale and nested-intensity sampling techniques for archaeological survey
O. Burger, L.C. Todd, P. Burnett, T.J. Stohlgren, D. Stephens
2004, Journal of Field Archaeology (29) 409-423
This paper discusses sampling techniques for archaeological survey that are directed toward evaluating the properties of surface artifact distributions. The sampling techniques we experimented with consist of a multi-scale sampling plot developed in plant ecology and the use of a nested-intensity survey design. We present results from the initial application...
Evaluating the source of streamwater nitrate using δ15N and δ18O in nitrate in two watersheds in New Hampshire, USA
Linda H. Pardo, Carol Kendall, Jennifer Pett-Ridge, Cecily C.Y. Chang
2004, Hydrological Processes (18) 2699-2712
The natural abundance of nitrogen and oxygen isotopes in nitrate can be a powerful tool for identifying the source of nitrate in streamwater in forested watersheds, because the two main sources of nitrate, atmospheric deposition and microbial nitrification, have distinct δ18O values. Using a simple mixing model, we estimated the...
VOCs in shallow groundwater in new residential/commercial areas of the United States
P. J. Squillace, M.J. Moran, C. V. Price
2004, Environmental Science & Technology (38) 5327-5338
The quality of shallow groundwater in urban areas was investigated by sampling 518 monitoring wells between 1996 and 2002 as part of the National Water-Quality Assessment Program of the U.S. Geological Survey. Well networks were installed primarily in new residential/commercial areas less than about 30 years old (17 studies) and...
Borehole petrophysical chemostratigraphy of Pennsylvanian black shales in the Kansas subsurface
J.H. Doveton, D. F. Merriam
2004, Chemical Geology (206) 249-258
Pennsylvanian black shales in Kansas have been studied on outcrop for decades as the core unit of the classic Midcontinent cyclothem. These shales appear to be highstand condensed sections in the sequence stratigraphic paradigm. Nuclear log suites provide several petrophysical measurements of rock chemistry that are a useful data source...
Frequency-dependent Lg Q within the continental United States
D. Erickson, D.E. McNamara, H.M. Benz
2004, Bulletin of the Seismological Society of America (94) 1630-1643
Frequency-dependent crustal attenuation (1/Q) is determined for seven distinct physiographic/tectonic regions of the continental United States using high-quality Lg waveforms recorded on broadband stations in the frequency band 0.5 to 16 Hz. Lg attenuation is determined from time-domain amplitude measurements in one-octave frequency bands centered on the frequencies 0.75, 1.0,...
Lake Powell management alternatives and values: CVM estimates of recreation benefits
A. J. Douglas, D.A. Harpman
2004, Water International (29) 375-383
This paper presents data analyses based on information gathered from a recreation survey distributed during the spring of 1997 at Lake Powell. Recreation-linked management issues are the foci of the survey and this discussion. Survey responses to contingent valuation method (CVM) queries included in the questionnaire quantify visitor recreation values....
Winter survival of lesser scaup in east-central Florida
G. Herring, J.A. Collazo
2004, Journal of Wildlife Management (68) 1082-1087
The North American continental population of lesser scaup (Aythya affinis) has been declining since the mid-1980s. Seasonal survival estimates may provide insights about the ecological basis for this decline, but such data are not available. We estimated post-harvest winter survival of lesser scaup in east-central Florida, USA, where 62% of...
Effects of marine reserves and urchin disease on southern Californian rocky reef communities
Michael D. Behrens, Kevin D. Lafferty
2004, Marine Ecology Progress Series (279) 129-139
While the species level effects of marine reserves are widely recognized, community level shifts due to marine reserves have only recently been documented. Protection from fishing of top predators may lead to trophic cascades, which have community-wide implications. Disease may act in a similar manner, regulating population levels of dominant...
A Holocene pollen record of persistent droughts from Pyramid Lake, Nevada, USA
S.A. Mensing, L. V. Benson, Michaele Kashgarian, S. Lund
2004, Quaternary Research (62) 29-38
Pollen and algae microfossils preserved in sediments from Pyramid Lake, Nevada, provide evidence for periods of persistent drought during the Holocene age. We analyzed one hundred nineteen 1-cm-thick samples for pollen and algae from a set of cores that span the past 7630 years. The early middle Holocene, 7600 to...
Invertebrate Paleontology of the Wilson Grove Formation (Late Miocene to Late Pliocene), Sonoma and Marin Counties, California, with some Observations on Its Stratigraphy, Thickness, and Structure
Charles L. Powell II, James R. Allen, Peter J. Holland
2004, Open-File Report 2004-1017
The Wilson Grove Formation is exposed from Petaluma north to northern Santa Rosa, and from Bennett Valley west to Bodega Bay. A fauna of at least 107 invertebrate taxa consisting of two brachiopods, 95 mollusks (48 bivalves and 46 gastropods), at least eight arthropods, and at least two echinoids have...
Habitat use and preferences of breeding female wood ducks
Kevin M. Hartke, Gary R. Hepp
2004, Journal of Wildlife Management (68) 84-93
Female wood ducks (Aix sponsa) feed primarily on plant foods in the prelaying period and switch to a diet of mostly invertebrates during egg production. If nutrient acquisition is habitat-specific, then selection and use of habitats may differ between these reproductive stages. A better understanding of these processes is needed...
Tracing sources of nitrate in snowmelt runoff using a high-resolution isotopic technique
N. Ohte, S.D. Sebestyen, J. B. Shanley, D.H. Doctor, C. Kendall, Scott D. Wankel, E.W. Boyer
2004, Geophysical Research Letters (31)
The denitrifier method to determine the dual isotopic composition (??15N and ??18O) of nitrate is well suited for studies of nitrogen contributions to streams during runoff events. This method requires only 70 nmol of NO3- and enables high throughput of samples. We studied nitrate sources to a headwater stream during...
Ground motion in Anchorage, Alaska, from the 2002 Denali fault earthquake: Site response and displacement pulses
D.M. Boore
2004, Bulletin of the Seismological Society of America (94) S72-S84
Data from the 2002 Denali fault earthquake recorded at 26 sites in and near Anchorage, Alaska, show a number of systematic features important in studies of site response and in constructing long-period spectra for use in earthquake engineering. The data demonstrate that National Earthquake Hazards Reduction Program (NEHRP) site classes...
Does presence of permanent fresh water affect recruitment in prairie-nesting dabbling ducks?
Gary L. Krapu, P.J. Pietz, D.A. Brandt, R. R. Cox Jr.
2004, Journal of Wildlife Management (68) 332-341
In the Prairie Pothole Region (PPR) of North Dakota, USA, American mink (Mustela vison) are a major predator of ducklings. Mink populations plummet during severe droughts, but some mink survive where permanent fresh water is available. In 1992–1993, we evaluated whether development of a permanent water body, the 125-km...
St. Louis Metro East region sediment and geomorphic study
T. D. Straub
Sehlke G.Hayes D.F.Stevens D.K., editor(s)
2004, Conference Paper, Proceedings of the 2004 World Water and Environmetal Resources Congress: Critical Transitions in Water and Environmetal Resources Management
Judy's Branch, a small basin (8.64 mi2) near Glen Carbon, Illinois, is selected as a pilot site to determine sediment yield and channel erosion of streams draining the bluffs of the American Bottoms in the Metro East area of Illinois. This paper presents results of an on-going sediment and geomorphic...
