Bobjonesite, V4+ O (SO4) (H2O)3, a new mineral species from Temple Mountain, Emery County, Utah, U.S.A
Michael Schindler, Frank C. Hawthorne, Danielle M. C. Huminicki, Patrick Haynes, Joel D. Grice, Howard T. Evans Jr.
2003, Canadian Mineralogist (41) 83-90
Bobjonesite, V4+ O (SO4) (H2O)3, is a new mineral species from Temple Mountain, Emery County, Utah, U.S.A. It occurs as blue-green crusts and efflorescences in fractures in a fossil (Triassic) tree; individual crystals are <<1 mm and are intimately intergrown. Bobjonesite hydrates very easily, and...
Identification of site frequencies from building records
M. Çelebi
2003, Earthquake Spectra (19) 1-23
A simple procedure to identify site frequencies using earthquake response records from roofs and basements of buildings is presented. For this purpose, data from five different buildings are analyzed using only spectral analyses techniques. Additional data such as free-field records in close proximity to the buildings and site characterization data...
Orbital control of low-latitude seasonality during the Eemian
Amos Winter, A. Paul, J. Nyberg, T. Oba, J. Lundberg, D. Schrag, Bruce E. Taggart
2003, Geophysical Research Letters (30) 12-1
We used Sr/Ca and stable isotope data from well dated and preserved corals from the northeastern Caribbean to determine the seasonal environmental conditions for four continuous years during the Eemian, the last time the Earth was in a prolonged warm phase. We determined that the seasonal range in SST during...
Selenium isotope fractionation during reduction by Fe(II)-Fe(III) hydroxide-sulfate (green rust)
T.M. Johnson, Thomas D. Bullen
2003, Geochimica et Cosmochimica Acta (67) 413-419
We have determined the extent of Se isotope fractionation induced by reduction of selenate by sulfate interlayered green rust (GRSO4), a Fe(II)-Fe(III) hydroxide-sulfate. This compound is known to reduce selenate to Se(0), and it is the only naturally relevant abiotic selenate reduction pathway...
Signatures of the seismic source in EMD-based characterization of the 1994 Northridge, California, earthquake recordings
R.R. Zhang, S. Ma, S. Hartzell
2003, Bulletin of the Seismological Society of America (93) 501-518
In this article we use empirical mode decomposition (EMD) to characterize the 1994 Northridge, California, earthquake records and investigate the signatures carried over from the source rupture process. Comparison of the current study results with existing source inverse solutions that use traditional data processing suggests that the EMD-based characterization contains...
Gaussian statistics for palaeomagnetic vectors
Jeffrey J. Love, C.G. Constable
2003, Geophysical Journal International (152) 515-565
With the aim of treating the statistics of palaeomagnetic directions and intensities jointly and consistently, we represent the mean and the variance of palaeomagnetic vectors, at a particular site and of a particular polarity, by a probability density function in a Cartesian three-space of orthogonal magnetic-field components consisting of a...
Lithologic mapping in the Mountain Pass, California area using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data
L. C. Rowan, J.C. Mars
2003, Remote Sensing of Environment (84) 350-366
Evaluation of an Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) image of the Mountain Pass, California area indicates that several important lithologic groups can be mapped in areas with good exposure by using spectral-matching techniques. The three visible and six near-infrared bands, which have 15-m and 30-m resolution, respectively,...
Status and interconnections of selected environmental issues in the global coastal zones
Hua Shi, Ashbindu Singh
2003, Ambio (32) 145-152
This study focuses on assessing the state of population distribution, land cover distribution, biodiversity hotspots, and protected areas in global coastal zones. The coastal zone is defined as land within 100 km of the coastline. This study attempts to answer such questions as: how crowded are the coastal zones, what...
Mapping mine wastes and analyzing areas affected by selenium-rich water runoff in southeast Idaho using AVIRIS imagery and digital elevation data
J.C. Mars, J.K. Crowley
2003, Remote Sensing of Environment (84) 422-436
Remotely sensed hyperspectral and digital elevation data from southeastern Idaho are combined in a new method to assess mine waste contamination. Waste rock from phosphorite mining in the area contains selenium, cadmium, vanadium, and other metals. Toxic concentrations of selenium have been found in plants and soils near some mine...
Surface wave tomography of North America and the Caribbean using global and regional broad-band networks: Phase velocity maps and limitations of ray theory
S. Godey, R. Snieder, A. Villasenor, H.M. Benz
2003, Geophysical Journal International (152) 620-632
We present phase velocity maps of fundamental mode Rayleigh waves across the North American and Caribbean plates. Our data set consists of 1846 waveforms from 172 events recorded at 91 broad-band stations operating in North America. We compute phase velocity maps in four narrow period bands between 50 and 150...
Home range and movements of boreal toads in undisturbed habitat
E. Muths
2003, Copeia 160-165
I sampled movements and amount of area used by boreal toads (Bufo boreas) between June and October for 3 yr. Females were found farther from the breeding site than were males, and mean home ranges, as calculated by the adaptive kernel method, were four times larger for females than for males. Temperature and snow accumulation were comparable...
Fault systems of the 1971 San Fernando and 1994 Northridge earthquakes, southern California: Relocated aftershocks and seismic images from LARSE II
G. S. Fuis, R.W. Clayton, P.M. Davis, T. Ryberg, W. J. Lutter, D. A. Okaya, E. Hauksson, C. Prodehl, J.M. Murphy, M.L. Benthien, S.A. Baher, M.D. Kohler, K. Thygesen, G. Simila, Gordon R. Keller
2003, Geology (31) 171-174
We have constructed a composite image of the fault systems of the M 6.7 San Fernando (1971) and Northridge (1994), California, earthquakes, using industry reflection and oil test well data in the upper few kilometers of the crust, relocated aftershocks in the seismogenic crust, and LARSE II (Los Angeles Region...
Paleomagnetism and geochronology of an Early Proterozoic quartz diorite in the southern Wind River Range, Wyoming, USA
S. S. Harlan, J.W. Geisman, W. R. Premo
2003, Tectonophysics (362) 105-122
We present geochronologic and paleomagnetic data from a north-trending quartz diorite intrusion that cuts Archean metasedimentary and metaigneous rocks of the South Pass Greenstone Belt of the Wyoming craton. The quartz diorite was previously thought to be either Archean or Early Proterozoic (?) in age and is cut by north...
Strong ground-motion prediction from Stochastic-dynamic source models
Mariagiovanna Guatteri, P.M. Mai, G. C. Beroza, J. Boatwright
2003, Bulletin of the Seismological Society of America (93) 301-313
In the absence of sufficient data in the very near source, predictions of the intensity and variability of ground motions from future large earthquakes depend strongly on our ability to develop realistic models of the earthquake source. In this article we simulate near-fault strong ground motion using dynamic source models....
Gravity and magnetic expression of the San Leandro gabbro with implications for the geometry and evolution of the Hayward Fault zone, northern California
D. A. Ponce, T.G. Hildenbrand, R.C. Jachens
2003, Bulletin of the Seismological Society of America (93) 14-26
The Hayward Fault, one of the most hazardous faults in northern California, trends north-northwest and extends for about 90 km along the eastern San Francisco Bay region. At numerous locations along its length, distinct and elongate gravity and magnetic anomalies correlate with mapped mafic and ultramafic rocks. The most prominent...
Temporal species richness-biomass relationships along successional gradients
Q. Guo
2003, Journal of Vegetation Science (14) 121-128
Diversity-biomass relationships are frequently reported to be hump-shaped over space at a given time. However, it is not yet clear how diversity and biomass change simultaneously and how they are related to each other overtime (e.g. in succession) at one locality. This study develops a temporal model based on the...
Characterization and copper binding of humic and nonhumic organic matter isolated from the South Platte River: Evidence for the presence of nitrogenous binding site
J.-P. Croue, M.F. Benedetti, D. Violleau, J.A. Leenheer
2003, Environmental Science & Technology (37) 328-336
Humic substances typically constitute 40−60% of the dissolved organic matter (DOM) in surface waters. However, little information is available regarding the metal binding properties of the nonhumic hydrophilic portion of the DOM. In this study, humic and nonhumic DOM samples were isolated from the South Platte River...
Environmental water-quality zones for streams: A regional classification scheme
Dale M. Robertson, D. A. Saad
2003, Environmental Management (31) 581-602
Various approaches have been used to classify large geographical areas into smaller regions of similar water quality or extrapolate water-quality data from a few streams to other unmonitored streams. A combination of some of the strengths of existing techniques is used to develop a new approach for these purposes. In...
Geothermometry, geochronology, and mass transfer associated with hydrothermal alteration of a rhyolitic hyaloclastite from Ponza Island, Italy
S. P. Altaner, R.F. Ylagan, S.M. Savin, J.L. Aronson, H. E. Belkin, A. Pozzuoli
2003, Geochimica et Cosmochimica Acta (67) 275-288
A rhyolitic hyaloclastite from Ponza Island, Italy, was hydrothermally altered, producing four distinct alteration zones based on X-ray diffraction mineralogy and field textures: (1) nonpervasive argillic zone; (2) propylitic zone; (3) silicic zone; and (4) sericitic zone. The unaltered hyaloclastite is volcanic breccia with clasts of vesiculated obsidian in a...
Quantitative PCR analysis of CYP1A induction in Atlantic salmon (Salmo salar)
C.B. Rees, S. D. McCormick, Heuvel Vanden, W. Li
2003, Aquatic Toxicology (62) 67-78
Environmental pollutants are hypothesized to be one of the causes of recent declines in wild populations of Atlantic salmon (Salmo salar) across Eastern Canada and the United States. Some of these pollutants, such as polychlorinated biphenyls and dioxins, are known to induce expression of the CYP1A subfamily of genes. We...
Detecting trends in landscape pattern metrics over a 20-year period using a sampling-based monitoring programme
J. A. Griffith, S.V. Stehman, Terry L. Sohl, Thomas R. Loveland
2003, International Journal of Remote Sensing (24) 175-181
Temporal trends in landscape pattern metrics describing texture, patch shape and patch size were evaluated in the US Middle Atlantic Coastal Plain Ecoregion. The landscape pattern metrics were calculated for a sample of land use/cover data obtained for four points in time from 1973-1992. The multiple sampling dates permit evaluation...
Wave propagation and site response in the Santa Clara Valley
Joe B. Fletcher, J. Boatwright, A.G. Lindh
2003, Bulletin of the Seismological Society of America (93) 480-500
Forty-two portable digital instruments were deployed across the Santa Clara Valley from June until early November 1998; this array recorded 14 small and moderate local events and 7 large teleseismic events. We analyze the ground motion from these events to determine station delays...
A comparison of measures of riverbed form for evaluating distributions of benthic fishes
Mark L. Wildhaber, Peter J. Lamberson, David L. Galat
2003, North American Journal of Fisheries Management (23) 543-557
A method to quantitatively characterize the bed forms of a large river and a preliminary test of the relationship between bed-form characteristics and catch per unit area of benthic fishes is presented. We used analog paper recordings of bathymetric data from the Missouri River and fish data collected from 1996...
Lithospheric buoyancy and continental intraplate stresses
M.L. Zoback, Walter D. Mooney
2003, International Geology Review (45) 95-118
Lithospheric buoyancy, the product of lithospheric density and thickness, is an important physical property that influences both the long-term stability of continents and their state of stress. We have determined lithospheric buoyancy by applying the simple isostatic model of Lachenbruch and Morgan (1990). We determine the crustal portion of lithospheric...
Mercury in US coal: Observations using the COALQUAL and ICR data
J.C. Quick, T.C. Brill, D.E. Tabet
2003, Conference Paper, Environmental Geology
The COALQUAL data set lists the mercury content of samples collected from the in-ground US coal resource, whereas the ICR data set lists the mercury content of samples collected from coal shipments delivered to US electric utilities. After selection and adjustment of records, the COALQUAL data average 0.17 ??g Hg/g...
