Mapping the sources of the seismic wave field at Kilauea volcano, Hawaii, using data recorded on multiple seismic Antennas
J. Almendros, B. Chouet, P. Dawson, Caleb G. Huber
2002, Bulletin of the Seismological Society of America (92) 2333-2351
Seismic antennas constitute a powerful tool for the analysis of complex wave fields. Well-designed antennas can identify and separate components of a complex wave field based on their distinct propagation properties. The combination of several antennas provides the basis for a more complete understanding of volcanic wave fields, including an...
Comment on "How fast is rupture during an earthquake? New insights from the 1999 Turkey earthquakes"
D.J. Andrews
2002, Geophysical Research Letters (29) 9-1-9-4
No abstract available....
Simulations of seismic hazard for the Pacific Northwest of the United States from earthquakes associated with the Cascadia subduction zone
M.D. Petersen, C.H. Cramer, A.D. Frankel
2002, Pure and Applied Geophysics (159) 2147-2168
We investigate the impact of different rupture and attenuation models for the Cascadia subduction zone by simulating seismic hazard models for the Pacific Northwest of the U.S. at 2% probability of exceedance in 50 years. We calculate the sensitivity of hazard (probabilistic ground motions) to the source parameters and the...
Study of high SAR backscattering caused by an increase of soil moisture over a sparsely vegetated area: Implications for characteristics of backscattering
Z. Lu, D. J. Meyer
2002, International Journal of Remote Sensing (23) 1063-1074
We used interferometric methods on a pair of repeat-pass ERS-1 synthetic aperture radar (SAR) images to study soil moisture changes over sparsely vegetated targets. The intensity of the SAR image acquired at one time was higher than that of an image acquired at an earlier time. We used a correlation...
Mangrove isotopic (δ15N and δ13C) fractionation across a nitrogen vs. phosphorus limitation gradient
Karen L. McKee, Ilka C. Feller, Marianne Popp, Wolfgang Wanek
2002, Ecology (83) 1065-1075
Mangrove islands in Belize are characterized by a unique switching from nitrogen (N) to phosphorus (P) limitation to tree growth from shoreline to interior. Fertilization has previously shown that Rhizophora mangle (red mangrove) fringe trees (5–6 m tall) growing along the shoreline are N limited; dwarf trees (≤ 1.5 m tall) in...
Elevations of water-worn features on Mars: Implications for circulation of groundwater
M. H. Carr
2002, Journal of Geophysical Research E: Planets (107) 14-1-14-11
Central to the model of the evolution of the martian hydrosphere by Clifford and Parker [2001] is a permanent freezing of the planet at the end of the Noachian and recharge of the global groundwater system by basal melting of ice-rich polar deposits. Acquisition of MOLA data by Mars Global Surveyor provides a...
AVHRR composite period selection for land cover classification
S.K. Maxwell, R.M. Hoffer, P.L. Chapman
2002, International Journal of Remote Sensing (23) 5043-5059
Multitemporal satellite image datasets provide valuable information on the phenological characteristics of vegetation, thereby significantly increasing the accuracy of cover type classifications compared to single date classifications. However, the processing of these datasets can become very complex when dealing with multitemporal data combined with multispectral data. Advanced Very High Resolution...
Key Largo Limestone revisited: Pleistocene shelf-edge facies, Florida Keys, USA
Multer H. Gray, E. Gischler, J. Lundberg, K. R. Simmons, E.A. Shinn
2002, Facies 229-272
New dates and analysis of 12 deep and 57 shallow cores allow a more detailed interpretation of the Pleistocene shelf edge of the Florida Platform as found in various facies of the Key Largo Limestone beneath the Florida Keys. In this study a three-phase evolution of the Quaternary units (Q1-Q5)...
Effects of surface run-off on the transport of agricultural chemicals to ground water in a sandplain setting
G. N. Delin, M.K. Landon
2002, Science of the Total Environment (295) 143-155
An experiment was conducted at a depressional (lowland) and an upland site in sandy soils to evaluate the effects of surface run-off on the transport of agricultural chemicals to ground water. Approximately 16.5 cm of water was applied to both sites during the experiment,...
The structure of Yb3+ aquo ion and chloro complexes in aqueous solutions at up to 500 °C and 270 MPa
Robert A. Mayanovic, Sumedha Jayanetti, Alan J. Anderson, William A. Bassett, I.-M. Chou
2002, Journal of Physical Chemistry A (106) 6591-6599
We report here on X-ray absorption fine structure (XAFS) measurements used to determine the structure of the Yb3+ ion in aqueous solutions over a range of temperatures from 25 to 500 °C and pressures up to 270 MPa. Fluorescence Yb L3-edge spectra were collected separately from nitrate (0.006m Yb/0.16m HNO3) and chloride (0.006 m YbCl3/0.017 m HCl) aqueous...
The use of U.S. Geological Survey CD-ROM-based petroleum assessments in undergraduate geology laboratories
R. L. Eves, L. E. Davis, T. S. Dyman, K. I. Takahashi
2002, Journal of Geoscience Education (50) 312-321
Domestic oil production is declining and United States reliance on imported oil is increasing. America will be faced with difficult decisions that address the strategic, economic, and political consequences of its energy resources shortage. The geologically literate undergraduate student needs to be aware of current and future United States energy...
Diet of Crotalus lepidus klauberi (Banded Rock Rattlesnake)
Andrew T. Holycross, C. W. Painter, D. B. Prival, Don Swann, M. J. Schroff, Taylor Edwards, C.R. Schwalbe
2002, Journal of Herpetology (36) 589-597
We describe the diet of Crotalus lepidus klauberi (Banded Rock Rattlesnake) using samples collected in the field and from museum specimens, as well as several records from unpublished reports. Most records (approximately 91%) were from the northern Sierra Madrean Archipelago. Diet consisted of 55.4% lizards, 28.3% scolopendromorph centipedes, 13.8% mammals, 1.9%...
Using chemical, hydrologic, and age dating analysis to delineate redox processes and flow paths in the riparian zone of a glacial outwash aquifer‐stream system
Larry J. Puckett, Timothy K. Cowdery, Peter B. McMahon, Lan H. Tornes, Jeffrey D. Stoner
2002, Water Resources Research (38) 9-1-9-20
A combination of chemical and dissolved gas analyses, chlorofluorocarbon age dating, and hydrologic measurements were used to determine the degree to which biogeochemical processes in a riparian wetland were responsible for removing NO3−from groundwaters discharging to the Otter Tail River in west central Minnesota. An analysis of river chemistry and...
High-resolution seismic velocities and shallow structure of the San Andreas fault zone at Middle Mountain, Parkfield, California
R. D. Catchings, M. J. Rymer, M. R. Goldman, J.A. Hole, R. Huggins, C. Lippus
2002, Bulletin of the Seismological Society of America (92) 2493-2503
A 5-km-long, high-resolution seismic imaging survey across the San Andreas fault (SAF) zone and the proposed San Andreas Fault Observatory at Depth (SAFOD) drill site near Parkfield, California, shows that velocities vary both laterally and vertically. Velocities range from <1.0 km/sec near the surface to as much as 4.8 km/sec...
Inter-annual, seasonal and spatial variability in nutrient limitation of phytoplankton production in a river impoundment
P.A. Bukaveckas, A.S. Crain
2002, Hydrobiologia (481) 19-31
We characterize seasonal and spatial patterns in phytoplankton abundance, production and nutrient limitation in a mesotrophic river impoundment located in the southeastern United States to assess variation arising from inter-annual differences in watershed inputs. Short-term (48 h) in situ nutrient addition experiments were conducted between May and October at three...
Bryophytes from Tuxedni Wilderness area, Alaska
Wilfred B. Schofield, Stephen S. Talbot, Sandra L. Talbot
2002, Journal of the Hattori Botanical Laboratory (92) 91-123
The bryoflora of two small maritime islands, Chisik and Duck Island (2,302 ha), comprising Tuxedni Wilderness in western lower Cook Inlet, Alaska, was examined to determine species composition in an area where no previous collections had been reported. The field study was conducted from sites selected to represent the totality...
Instrumental intensity distribution for the Hector Mine, California, and the Chi-Chi, Taiwan, earthquakes: Comparison of two methods
V. Sokolov, D.J. Wald
2002, Bulletin of the Seismological Society of America (92) 2145-2162
We compare two methods of seismic-intensity estimation from ground-motion records for the two recent strong earthquakes: the 1999 (M 7.1) Hector Mine, California, and the 1999 (M 7.6) Chi-Chi, Taiwan. The first technique utilizes the peak ground acceleration (PGA) and velocity (PGV), and it is used for rapid generation of...
An assessment of injury to sediments and sediment-dwelling organisms in the Grand Calumet River and Indiana Harbor Area of Concern, USA
D.D. MacDonald, C.G. Ingersoll, D.E. Smorong, R.A. Lindskoog, D. W. Sparks, J.R. Smith, T.P. Simon, M.A. Hanacek
2002, Archives of Environmental Contamination and Toxicology (43) 141-155
This article is the first in a series of three that describe the results of a Natural Resource Damage Assessment (NRDA) conducted in the Grand Calumet River and Indiana Harbor Area of Concern (IHAOC). The assessment area is located in northwest Indiana and was divided into nine reaches to facilitate...
An application of LIDAR to analyses of El Nino erosion in the Netarts littoral cell, Oregon
D.L. Revell, P.D. Komar, A. H. Sallenger Jr.
2002, Journal of Coastal Research (18) 792-801
El Nin??o produces coastal and beach erosion along the West Coast of the USA by elevating mean water levels so that tides are significantly higher than predicted, and by altering the paths of storms that generate large waves. In the past it has been difficult to adequately document the erosion...
The impact of climatic and seismic events on the short-term evolution of seacliffs based on 3-D mapping: Northern Monterey Bay, California
C. Hapke, B. Richmond
2002, Marine Geology (187) 259-278
Coastal cliff retreat along the central California coast is episodic, occurring in response to single large storms or seismic events. Traditional approaches to the study of long-term seacliff retreat utilize historical aerial photography and maps to delineate the landward migration of the top edge of the cliff over periods of...
Reproductive success of the interior least tern (Sterna antillarum) in relation to hydrology on the Lower Mississippi River
Katie M. Dugger, Mark R. Ryan, David L. Galat, Rochelle B. Renken, John W Smith
2002, River Research and Applications (18) 97-105
The annual hydrograph of large rivers, including flood pulses and low-flow periods, is believed to play a primary role in the productivity of biota associated with these ecosystems. We investigated the relationship between river hydrology and Interior least tern (Sterna antillarum) reproductive success on the Lower Mississippi River from April...
Reactivity and mobility of new and old mercury deposition in a boreal forest ecosystem during the first year of the METAALICUS study
H. Hintelmann, R. Harris, A. Heyes, J.P. Hurley, C.A. Kelly, D. P. Krabbenhoft, S. Lindberg, J.W.M. Rudd, K.J. Scott, Louis
2002, Environmental Science & Technology (36) 5034-5040
The METAALICUS (Mercury Experiment To Assess Atmospheric Loading In Canada and the US) project is a whole ecosystem experiment designed to study the activity, mobility, and availability of atmospherically deposited mercury. To investigate the dynamics of mercury newly deposited onto a terrestrial ecosystem, an enriched stable isotope...
Low-maturity Kulthieth Formation coal: A possible source of polycyclic aromatic hydrocarbons in benthic sediment of the northern Gulf of Alaska
G. K. Van Kooten, J.W. Short, J.J. Kolak
2002, Environmental Forensics (3) 227-241
The successful application of forensic geology to contamination studies involving natural systems requires identification of appropriate endmembers and an understanding of the geologic setting and processes affecting the systems. Studies attempting to delineate the background, or natural, source for hydrocarbon contamination in Gulf of Alaska (GOA) benthic sediments have invoked...
Spatial forecasting of disease risk and uncertainty
L. De Cola
2002, Cartography and Geographic Information Science (29) 363-380
Because maps typically represent the value of a single variable over 2-dimensional space, cartographers must simplify the display of multiscale complexity, temporal dynamics, and underlying uncertainty. A choropleth disease risk map based on data for polygonal regions might depict incidence (cases per 100,000 people) within each polygon for a year...
Increased incidence of red imported fire ant (Hymenoptera: Formicidae) presence in loggerhead sea turtle (Testudines: Cheloniidae) nests and observations of hatchling mortality
L.B. Parris, M.M. Lamont, R.R. Carthy
2002, Florida Entomologist (85) 514-517
No abstract available....
