Surface deformation associated with the March 1996 earthquake swarm at Akutan Island, Alaska, revealed by C-band ERS and L-band JERS radar interferometry
Z. Lu, C. Wicks Jr., O. Kwoun, J.A. Power, D. Dzurisin
2005, Canadian Journal of Remote Sensing (31) 7-20
In March 1996, an intense earthquake swarm beneath Akutan Island, Alaska, was accompanied by extensive ground cracking but no eruption of Akutan volcano. Radar interferograms produced from L-band JERS-1 and C-band ERS-1/2 images show uplift associated with the swarm by as much as 60 cm on the western...
Geographic variation in survival and migratory tendency among North American Common Mergansers
John M. Pearce, John A. Reed, Paul L. Flint
2005, Journal of Field Ornithology (76) 109-118
Movement ecology and demographic parameters for the Common Merganser (Mergus merganser americanus) in North America are poorly known. We used band-recovery data from five locations across North America spanning the years 1938–1998 to examine migratory patterns and estimate survival rates. We examined competing time-invariant, age-graduated models with program MARK...
Source process of a long-period event at Kilauea volcano, Hawaii
Hiroyuki Kumagai, B. A. Chouet, P.B. Dawson
2005, Geophysical Journal International (161) 243-254
We analyse a long-period (LP) event observed by a dense seismic network temporarily operated at Kilauea volcano, Hawaii, in 1996. We systematically perform spectral analyses, waveform inversions and forward modeling of the LP event to quantify its source process. Spectral analyses identify two dominant spectral frequencies at 0.6 and 1.3...
Evaluation of argon ages and integrity of fluid-inclusion compositions: Stepwise noble gas heating experiments on 1.87 Ga alunite from Tapajós Province, Brazil
G. P. Landis, L.W. Snee, Caetano Juliani
2005, Chemical Geology (215) 127-153
Quantitative analyses are reported for active (N2, CH4, CO, CO2, H2, O2, HF, HCl, H2S, SO2) and noble (He, Ar, Ne) gases released by crushing and step heating of magmatic-hydrothermal alunite from the Tapajós gold province in Brazil. This is the oldest known alunite (40Ar/39Ar age of 1.87 Ga),...
CO2 dynamics in the Amargosa Desert: Fluxes and isotopic speciation in a deep unsaturated zone
Michelle Ann Walvoord, Robert G. Striegl, David E. Prudic, David A. Stonestrom
2005, Water Resources Research (41) 1-15
Natural unsaturated-zone gas profiles at the U.S. Geological Survey's Amargosa Desert Research Site, near Beatty, Nevada, reveal the presence of two physically and isotopically distinct CO2 sources, one shallow and one deep. The shallow source derives from seasonally variable autotrophic and heterotrophic respiration in the root zone. Scanning electron micrograph...
Voluminous granitic magmas from common basaltic sources
T. W. Sisson, K. Ratajeski, W.B. Hankins, A. F. Glazner
2005, Contributions to Mineralogy and Petrology (148) 635-661
Granitic-rhyolitic liquids were produced experimentally from moderately hydrous (1.7-2.3 wt% H2O) medium-to-high K basaltic compositions at 700 MPa and f O2 controlled from Ni-NiO -1.3 to +4. Amount and composition of evolved liquids and coexisting mineral assemblages vary with fO2 and temperature, with melt being more evolved at higher fO2s,...
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),...
Hypocenter locations in finite-source rupture models
P.M. Mai, P. Spudich, J. Boatwright
2005, Bulletin of the Seismological Society of America (95) 965-980
We use a database of more than 80 finite-source rupture models for more than 50 earthquakes (Mw, 4.1-8.1) with different faulting styles occurring in both tectonic and subduction environments to analyze the location of the hypocenter within the fault and to consider the correlation between hypocenter location and regions of...
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...
Slicing up the San Francisco Bay Area: Block kinematics and fault slip rates from GPS-derived surface velocities
M. A. d'Alessio, I.A. Johanson, R. Burgmann, D.A. Schmidt, M.H. Murray
2005, Journal of Geophysical Research B: Solid Earth (110) 1-19
Observations of surface deformation allow us to determine the kinematics of faults in the San Francisco Bay Area. We present the Bay Area velocity unification (BA??VU??, "bay view"), a compilation of over 200 horizontal surface velocities computed from campaign-style and continuous Global Positioning System (GPS) observations from 1993 to 2003....
Telemedicine diffusion in a developing country: The case of India (March 2004)
A. Pal, V.W.A. Mbarika, F. Cobb-Payton, P. Datta, S. McCoy
2005, IEEE Transactions on Information Technology in Biomedicine (9) 59-65
Telemedicine (health-care delivery where physicians examine distant patients using telecommunications technologies) has been heralded as one of several possible solutions to some of the medical dilemmas that face many developing countries. In this study, we examine the current state of telemedicine in a developing country, India. Telemedicine has brought a...
The fundamental thermal niche of adult landlocked striped bass
P.W. Bettoli
2005, Transactions of the American Fisheries Society (134) 305-314
Researchers have described the temperatures selected by landlocked striped bass Morone saxatilis in different locales throughout the USA. However, seasonally low concentrations of dissolved oxygen (DO) in many systems prevented striped bass from using the cool waters (<22??C) they may have preferred. In Melton Hill Reservoir, a 92-km-long impoundment on...
Testing the generality of a trophic-cascade model for plague
S.K. Collinge, W.C. Johnson, C. Ray, R. Matchett, J. Grensten, J.F. Cully Jr., K.L. Gage, M.Y. Kosoy, J.E. Loye, A.P. Martin
2005, EcoHealth (2) 102-112
Climate may affect the dynamics of infectious diseases by shifting pathogen, vector, or host species abundance, population dynamics, or community interactions. Black-tailed prairie dogs (Cynomys ludovicianus) are highly susceptible to plague, yet little is known about factors that influence the dynamics of plague epizootics in prairie dogs. We investigated temporal...
AVO for one- and two-fracture set models
Chen Hao, R.L. Brown, J.P. Castagna
2005, Geophysics (70)
A theoretical comparison is made of PP and PS angle-dependent reflection coefficients at the top of two fractured-reservoir models using exact, general, anisotropic reflection coefficients. The two vertical-fracture models are taken to have the same total crack density. The primary issue investigated is determination of the fracture orientation using azimuthal...
Climatic and topographic controls on the style and timing of Late Quaternary glaciation throughout Tibet and the Himalaya defined by 10Be cosmogenic radionuclide surface exposure dating
L.A. Owen, R.C. Finkel, P.L. Barnard, Ma Haizhou, K. Asahi, M.W. Caffee, E. Derbyshire
2005, Quaternary Science Reviews (24) 1391-1411
Temporal and spatial changes in glacier cover throughout the Late Quaternary in Tibet and the bordering mountains are poorly defined because of the inaccessibility and vastness of the region, and the lack of numerical dating. To help reconstruct the timing and extent of glaciation throughout Tibet and the bordering mountains,...
Concentrations of cadmium, lead, and zinc in fish from mining-influenced waters of northeastern Oklahoma: Sampling of blood, carcass, and liver for aquatic biomonitoring
W. G. Brumbaugh, C. J. Schmitt, T.W. May
2005, Archives of Environmental Contamination and Toxicology (49) 76-88
The Tri-States Mining District (TSMD) of Missouri (MO), Kansas (KS), and Oklahoma (OK), USA, was mined for lead (Pb) and zinc (Zn) for more than a century. Mining ceased more than 30 years ago, but wastes remain widely distributed in the region, and there is evidence of surface- and groundwater...
Fundamental challenges to methane recovery from gas hydrates
P. Servio, M.W. Eaton, D. Mahajan, W.J. Winters
2005, Topics in Catalysis (32) 101-107
The fundamental challenges, the location, magnitude, and feasibility of recovery, which must be addressed to recover methane from dispersed hydrate sources, are presented. To induce dissociation of gas hydrate prior to methane recovery, two potential methods are typically considered. Because thermal stimulation requires a large energy input, it is less...
Development of a bioenergetics model for humpback chub and evaluation of water temperature changes in the Grand Canyon, Colorado River
J.H. Petersen, C.P. Paukert
2005, Transactions of the American Fisheries Society (134) 960-974
The construction of Glen Canyon Dam above the Grand Canyon (Arizona) has reduced the water temperature in the Colorado River and altered the growth rate and feeding patterns of the federally endangered humpback chub Gila cypha. A bioenergetics model for humpback chub was developed and used to examine how warmer...
Aeolian processes at the Mars Exploration Rover Meridiani Planum landing site
R. Sullivan, D. Banfield, J.F. Bell III, W. Calvin, D. Fike, M. Golombek, R. Greeley, J. Grotzinger, Kenneth E. Herkenhoff, D. Jerolmack, M. Malin, D. Ming, Laurence A. Soderblom, S. W. Squyres, S. Thompson, W.A. Watters, C.M. Weitz, A. Yen
2005, Nature (436) 58-61
The martian surface is a natural laboratory for testing our understanding of the physics of aeolian (wind-related) processes in an environment different from that of Earth. Martian surface markings and atmospheric opacity are time-variable, indicating that fine particles at the surface are mobilized regularly by wind. Regolith (unconsolidated surface material)...
Transient population dynamics: Relations to life history and initial population state
D. N. Koons, J.B. Grand, B. Zinner, R.F. Rockwell
2005, Ecological Modelling (185) 283-297
Most environments are variable and disturbances (e.g., hurricanes, fires) can lead to substantial changes in a population's state (i.e., age, stage, or size distribution). In these situations, the long-term (i.e., asymptotic) measure of population growth rate (??1) may inaccurately represent population growth in the short-term. Thus, we calculated the short-term...
Utility of Penman-Monteith, Priestley-Taylor, reference evapotranspiration, and pan evaporation methods to estimate pasture evapotranspiration
D. M. Sumner, J.M. Jacobs
2005, Journal of Hydrology (308) 81-104
Actual evapotranspiration (ETa) was measured at 30-min resolution over a 19-month period (September 28, 2000-April 23, 2002) from a nonirrigated pasture site in Florida, USA, using eddy correlation methods. The relative magnitude of measured ETa (about 66% of long-term annual precipitation at the study site) indicates the importance of accurate...
Evidence for subsurface water ice in Korolev crater, Mars
John C. Armstrong, Timothy N. Titus, Hugh H. Kieffer
2005, Icarus (174) 360-372
Following the work of Kieffer and Titus (2001, Icarus 154, 162–180), we present results of thermal IR observations of Korolev crater, located at ∼73°">∼73° latitude in the martian northern polar region. Similar to techniques employed by Titus et al. (2003, Science 299, 1048–1050), we...
Topography and vegetation as predictors of snow water equivalent across the alpine treeline ecotone at Lee Ridge, Glacier National Park, Montana, U.S.A.
C. A. Geddes, Daniel G. Brown, Daniel B. Fagre
2005, Arctic, Antarctic, and Alpine Research (37) 197-205
We derived and implemented two spatial models of May snow water equivalent (SWE) at Lee Ridge in Glacier National Park, Montana. We used the models to test the hypothesis that vegetation structure is a control on snow redistribution at the alpine treeline ecotone (ATE). The statistical models were derived using...
Assessments of urban growth in the Tampa Bay watershed using remote sensing data
G. Xian, M. Crane
2005, Remote Sensing of Environment (97) 203-215
Urban development has expanded rapidly in the Tampa Bay area of west-central Florida over the past century. A major effect associated with this population trend is transformation of the landscape from natural cover types to increasingly impervious urban land. This research utilizes an innovative approach for mapping urban extent and...
