Processing of strong-motion accelerograms: Needs, options and consequences
D.M. Boore, J.J. Bommer
2005, Soil Dynamics and Earthquake Engineering (25) 93-115
Recordings from strong-motion accelerographs are of fundamental importance in earthquake engineering, forming the basis for all characterizations of ground shaking employed for seismic design. The recordings, particularly those from analog instruments, invariably contain noise that can mask and distort the ground-motion signal at both high and low frequencies. For any...
Invertebrate eggs can fly: Evidence of waterfowl-mediated gene flow in aquatic invertebrates
J. Figuerola, A.J. Green, T.C. Michot
2005, American Naturalist (165) 274-280
Waterfowl often have been assumed to disperse freshwater aquatic organisms between isolated wetlands, but no one has analyzed the impact of this transport on the population structure of aquatic organisms. For three cladocerans (Daphnia ambigua, Daphnia laevis, and Sida crystallina) and one bryozoan (Cristatella mucedo), we estimated the genetic distances...
The role of shoreland development and commercial cranberry farming in a lake in Wisconsin, USA
P.J. Garrison, S.A. Fitzgerald
2005, Journal of Paleolimnology (33) 169-188
Musky Bay in Lac Courte Oreilles, Wisconsin, USA, is currently eutrophic. This large, shallow bay of an oligotrophic lake possesses the densest aquatic plant growth and a floating algal mat. Paleoecological reconstructions encompassing the last 130 years, were based on multiproxy analyses of sediment cores from three coring sites, two...
Evidence for a global seismic-moment release sequence
C. G. Bufe, D. M. Perkins
2005, Bulletin of the Seismological Society of America (95) 833-843
Temporal clustering of the larger earthquakes (foreshock-mainshock-aftershock) followed by relative quiescence (stress shadow) are characteristic of seismic cycles along plate boundaries. A global seismic-moment release history, based on a little more than 100 years of instrumental earthquake data in an extended version of the catalog of Pacheco and Sykes (1992),...
Movements of walruses radio-tagged in Bristol Bay, Alaska
Chadwick V. Jay, Susan Hills
2005, Arctic (58) 192-202
Satellite radio-location data from 57 adult male Pacific walruses (Odobenus rosmarus divergens) were used to estimate haul-out fidelity, broadly describe seasonal foraging distributions, and determine the approximate timing of autumn migration from Bristol Bay, Alaska. Data were collected intermittently during 1987–91 and 1995–2000, primarily during the period from May to...
Habitat use, movements and home range of wintering Lesser Scaup in Florida
Garth Herring, Jaime A. Collazo
2005, Waterbirds (28) 71-78
Radio telemetry and diurnal time activity budgets were used to show that wintering Lesser Scaup (Aythya affinis) used different habitats for comfort and feeding activities at Merritt Island National Wildlife Refuge (Merritt Island), Florida and adjacent estuarine areas. Management should take this spatial consideration into account. The same data...
A geostatistical approach for describing spatial pattern in stream networks
L.M. Ganio, C.E. Torgersen, R. E. Gresswell
2005, Frontiers in Ecology and Evolution (3) 138-144
The shape and configuration of branched networks influence ecological patterns and processes. Recent investigations of network influences in riverine ecology stress the need to quantify spatial structure not only in a two-dimensional plane, but also in networks. An initial step in understanding data from stream networks is discerning non-random patterns...
Colorado Late Cenozoic Fault and Fold Database and Internet Map Server: User-friendly technology for complex information
K.S. Morgan, G.J. Pattyn, M.L. Morgan
2005, Environmental & Engineering Geoscience (11) 155-162
Internet mapping applications for geologic data allow simultaneous data delivery and collection, enabling quick data modification while efficiently supplying the end user with information. Utilizing Web-based technologies, the Colorado Geological Survey's Colorado Late Cenozoic Fault and Fold Database was transformed from a monothematic, nonspatial Microsoft Access database into a complex...
The most recent large earthquake on the Rodgers Creek fault, San Francisco bay area
S. Hecker, D. Pantosti, David P. Schwartz, J. C. Hamilton, L.M. Reidy, T. J. Powers
2005, Bulletin of the Seismological Society of America (95) 844-860
The Rodgers Creek fault (RCF) is a principal component of the San Andreas fault system north of San Francisco. No evidence appears in the historical record of a large earthquake on the RCF, implying that the most recent earthquake (MRE) occurred before 1824, when a Franciscan mission was built near...
Mapping variations in weight percent silica measured from multispectral thermal infrared imagery - Examples from the Hiller Mountains, Nevada, USA and Tres Virgenes-La Reforma, Baja California Sur, Mexico
S.J. Hook, J.E. Dmochowski, K. A. Howard, L. C. Rowan, K. E. Karlstrom, J. M. Stock
2005, Remote Sensing of Environment (95) 273-289
Remotely sensed multispectral thermal infrared (8-13 ??m) images are increasingly being used to map variations in surface silicate mineralogy. These studies utilize the shift to longer wavelengths in the main spectral feature in minerals in this wavelength region (reststrahlen band) as the mineralogy changes from felsic to mafic. An approach...
A note on the comparative turbidity of some estuaries of the Americas
R.J. Uncles, R. E. Smith
2005, Journal of Coastal Research (21) 845-852
Field data from 27 estuaries of the Americas are used to show that, in broad terms, there is a large difference in turbidity between the analyzed east and west-coast estuaries and that tidal range and tidal length have an important influence on that turbidity. Generic, numerical sediment-transport modeling is used...
Dynamic modeling of Tampa Bay urban development using parallel computing
G. Xian, M. Crane, D. Steinwand
2005, Computers & Geosciences (31) 920-928
Urban land use and land cover has changed significantly in the environs of Tampa Bay, Florida, over the past 50 years. Extensive urbanization has created substantial change to the region's landscape and ecosystems. This paper uses a dynamic urban-growth model, SLEUTH, which applies six geospatial data themes (slope, land use,...
Population genetic structure in migratory sandhill cranes and the role of Pleistocene glaciations
K.L. Jones, Gary L. Krapu, D.A. Brandt, M.V. Ashley
2005, Molecular Ecology (14) 2645-2657
Previous studies of migratory sandhill cranes (Grus canadensis) have made significant progress explaining evolution of this group at the species scale, but have been unsuccessful in explaining the geographically partitioned variation in morphology seen on the population scale. The objectives of this study were to assess the population structure and...
Forest cover influences dispersal distance of white-tailed deer
E.S. Long, Duane R. Diefenbach, C.S. Rosenberry, B.D. Wallingford, M.D. Grund
2005, Journal of Mammalogy (86) 623-629
Animal dispersal patterns influence gene flow, disease spread, population dynamics, spread of invasive species, and establishment of rare or endangered species. Although differences in dispersal distances among taxa have been reported, few studies have described plasticity of dispersal distance among populations of a single species. In 2002-2003, we radiomarked 308...
Subduction-zone magnetic anomalies and implications for hydrated forearc mantle
R.J. Blakely, T.M. Brocher, R.E. Wells
2005, Geology (33) 445-448
Continental mantle in subduction zones is hydrated by release of water from the underlying oceanic plate. Magnetite is a significant byproduct of mantle hydration, and forearc mantle, cooled by subduction, should contribute to long-wavelength magnetic anomalies above subduction zones. We test this hypothesis with a quantitative model of the Cascadia...
Comparing maps of mean monthly surface temperature and precipitation for Alaska and adjacent areas of Canada produced by two different methods
James J. Simpson, Gary L. Hufford, Christopher Daly, Jared S. Berg, Michael D. Fleming
2005, Arctic (58) 137-161
Maps of mean monthly surface temperature and precipitation for Alaska and adjacent areas of Canada, produced by Oregon State University's Spatial Climate Analysis Service (SCAS) and the Alaska Geospatial Data Clearinghouse (AGDC), were analyzed. Because both sets of maps are generally available and in use by the community, there is...
Generation and validation of characteristic spectra from EO1 Hyperion image data for detecting the occurrence of the invasive species, Chinese tallow
Elijah W. Ramsey III, A. Rangoonwala, G. Nelson, R. Ehrlich, K. Martella
2005, International Journal of Remote Sensing (26) 1611-1636
Chinese tallow (Triadica sebifera) is an invasive tree that is spreading throughout the south-eastern United States and now into the west, and in many places causing extensive change to native habitat and associated wildlife. Detecting and mapping the relative distribution of this species is important to its control and eradication....
Three-dimensional geologic map of the Hayward fault, northern California: Correlation of rock unites with variations in seismicity, creep rate, and fault dip
R. W. Graymer, D. A. Ponce, R.C. Jachens, R.W. Simpson, G. A. Phelps, C. M. Wentworth
2005, Geology (33) 521-524
In order to better understand mechanisms of active faults, we studied relationships between fault behavior and rock units along the Hayward fault using a three-dimensional geologic map. The three-dimensional map-constructed from hypocenters, potential field data, and surface map data-provided a geologic map of each fault surface, showing rock units on...
LogCauchy, log-sech and lognormal distributions of species abundances in forest communities
Z.-Y. Yin, S.-L. Peng, H. Ren, Q. Guo, Z.-H. Chen
2005, Ecological Modelling (184) 329-340
Species-abundance (SA) pattern is one of the most fundamental aspects of biological community structure, providing important information regarding species richness, species-area relation and succession. To better describe the SA distribution (SAD) in a community, based on the widely used lognormal (LN) distribution model with exp(-x2) roll-off on Preston's octave scale,...
Low summer water temperatures influence occurrence of naturalized salmonids across a mountain watershed
S.A. Mullner, W.A. Hubert
2005, North American Journal of Fisheries Management (25) 1034-1040
We investigated relationships between the absence of salmonids and low summer water temperatures across a 150-km2 Rocky Mountain watershed. A model predicting maximum July water temperature (MJT) from measurements of perennial stream length, wetted width, and midrange basin elevation was developed from temperature data obtained at 20 sites across the...
Characterizing the spatial structure of endangered species habitat using geostatistical analysis of IKONOS imagery
C.S.A. Wallace, S.E. Marsh
2005, International Journal of Remote Sensing (26) 2607-2629
Our study used geostatistics to extract measures that characterize the spatial structure of vegetated landscapes from satellite imagery for mapping endangered Sonoran pronghorn habitat. Fine spatial resolution IKONOS data provided information at the scale of individual trees or shrubs that permitted analysis of vegetation structure and pattern. We derived images...
The distribution of phosphorus in Popes Creek, VA, and in the Pocomoke River, MD: Two watersheds with different land management practices in the Chesapeake Bay Basin
N.S. Simon, O.P. Bricker, W. Newell, J. McCoy, R. Morawe
2005, Water, Air, & Soil Pollution (164) 189-204
This paper compares phosphorus (P) concentrations in sediments from two watersheds, one with, and one without, intensive animal agriculture. The watersheds are in the coastal plain of the Chesapeake Bay and have similar physiographic characteristics. Agriculture in the Pocomoke River, MD, watershed supplied 2.7 percent of all broiler chickens produced...
Discovery sequence and the nature of low permeability gas accumulations
E. D. Attanasi
2005, Natural Resources Research (14) 129-135
There is an ongoing discussion regarding the geologic nature of accumulations that host gas in low-permeability sandstone environments. This note examines the discovery sequence of the accumulations in low permeability sandstone plays that were classified as continuous-type by the U.S. Geological Survey for the 1995 National Oil and Gas Assessment....
Real-time forecasts of tomorrow's earthquakes in California
M.C. Gerstenberger, S. Wiemer, L.M. Jones, P.A. Reasenberg
2005, Nature (435) 328-331
Despite a lack of reliable deterministic earthquake precursors, seismologists have significant predictive information about earthquake activity from an increasingly accurate understanding of the clustering properties of earthquakes. In the past 15 years, time-dependent earthquake probabilities based on a generic short-term clustering model have been made publicly available in near-real time...
A simulation test of the effectiveness of several methods for error-checking non-invasive genetic data
David A. Roon, L.P. Waits, K.C. Kendall
2005, Animal Conservation (8) 203-215
Non-invasive genetic sampling (NGS) is becoming a popular tool for population estimation. However, multiple NGS studies have demonstrated that polymerase chain reaction (PCR) genotyping errors can bias demographic estimates. These errors can be detected by comprehensive data filters such as the multiple-tubes approach, but this approach is expensive and time...
