Motion of the Scotia sea plates
C. Thomas, R. Livermore, F. Pollitz
2003, Geophysical Journal International (155) 789-804
Earthquake data from the Scotia Arc to early 2002 are reviewed in the light of satellite gravity and other data in order to derive a model for the motion of plates in the Scotia Sea region. Events with magnitude ???5, which occurred on or near the boundaries of the Scotia...
The dependence of PGA and PGV on distance and magnitude inferred from Northern California ShakeMap data
J. Boatwright, H. Bundock, J. Luetgert, L. Seekins, L. Gee, P. Lombard
2003, Bulletin of the Seismological Society of America (93) 2043-2055
We analyze peak ground velocity (PGV) and peak ground acceleration (PGA) data from 95 moderate (3.5 ??? M < 5.5) and 9 large (5.5 ??? M ??? 7.1) earthquakes in northern California. The 95 moderate earthquakes occurred from August 1998 through December 2002, and their peak motions were compiled and...
Groundwater level changes in a deep well in response to a magma intrusion event on Kilauea Volcano, Hawai'i
S. Hurwitz, M.J.S. Johnston
2003, Geophysical Research Letters (30)
On May 21, 2001, an abrupt inflation of Kilauea Volcano's summit induced a rapid and large increase in compressional strain, with a maximum of 2 ??strain recorded by a borehole dilatometer. Water level (pressure) simultaneously dropped by 6 cm. This mode of water level change (drop) is in contrast to...
Aftershocks and triggered events of the Great 1906 California earthquake
A.J. Meltzner, D.J. Wald
2003, Bulletin of the Seismological Society of America (93) 2160-2186
The San Andreas fault is the longest fault in California and one of the longest strike-slip faults in the world, yet little is known about the aftershocks following the most recent great event on the San Andreas, the Mw 7.8 San Francisco earthquake on 18 April 1906. We conducted a...
Effects of disturbance on contribution of energy sources to growth of juvenile chinook salmon (Oncorhynchus tshawytscha) in boreal streams
R.W. Perry, M.J. Bradford, J.A. Grout
2003, Canadian Journal of Fisheries and Aquatic Sciences (60) 390-400
We used stable isotopes of carbon in a growth-dependent tissue-turnover model to quantify the relative contribution of autochthonous and terrestrial energy sources to juvenile chinook salmon (Oncorhynchus tshawytscha) in five small boreal streams tributary to the upper Yukon River. We used a tissue-turnover model because fish did not grow enough...
Mapping vegetation in Yellowstone National Park using spectral feature analysis of AVIRIS data
Raymond F. Kokaly, Don G. Despain, Roger N. Clark, K. Eric Livo
2003, Remote Sensing of Environment (84) 437-456
Knowledge of the distribution of vegetation on the landscape can be used to investigate ecosystem functioning. The sizes and movements of animal populations can be linked to resources provided by different plant species. This paper demonstrates the application of imaging spectroscopy to the study...
Using natural distributions of short-lived radium isotopes to quantify groundwater discharge and recharge
J.M. Krest, J. W. Harvey
2003, Limnology and Oceanography (48) 290-298
Radium activity in pore water of wetland sediments often differs from the amount expected from local production, decay, and exchange with solid phases. This disequilibrium results from vertical transport of radium with groundwater that flows between the underlying aquifer and surface water. In situations where groundwater recharge or discharge is...
Potential effects of climate change on ground water in Lansing, Michigan
T.E. Croley II, C. L. Luukkonen
2003, Journal of the American Water Resources Association (39) 149-163
Computer simulations involving general circulation models, a hydrologic modeling system, and a ground water flow model indicate potential impacts of selected climate change projections on ground water levels in the Lansing, Michigan, area. General circulation models developed by the Canadian Climate Centre and the Hadley Centre generated meteorology estimates for...
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....
Vegetation sensitivity to global anthropogenic carbon dioxide emissions in a topographically complex region
N.S. Diffenbaugh, L.C. Sloan, M.A. Snyder, J.L. Bell, J. Kaplan, S.L. Shafer, P. J. Bartlein
2003, Global Biogeochemical Cycles (17) 36-13
Anthropogenic increases in atmospheric carbon dioxide (CO2) concentrations may affect vegetation distribution both directly through changes in photosynthesis and water-use efficiency, and indirectly through CO2-induced climate change. Using an equilibrium vegetation model (BIOME4) driven by a regional climate model (RegCM2.5), we tested the sensitivity of vegetation in the western United...
Number and size of last-glacial Missoula floods in the Columbia River valley between the Pasco Basin, Washington, and Portland, Oregon
G. Benito, J. E. O’Connor
2003, Geological Society of America Bulletin (115) 624-638
Field evidence and radiocarbon age dating, combined with hydraulic flow modeling, provide new information on the magnitude, frequency, and chronology of late Pleistocene Missoula floods in the Columbia River valley between the Pasco Basin, Washington, and Portland, Oregon. More than 25 floods had discharges of > 1.0 x 106 m3/s. At...
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...
Seasonal movement of the Slumgullion landslide determined from global positioning system surveys and field instrumentation, July 1998-March 2002
J. A. Coe, W. L. Ellis, J. W. Godt, W. Z. Savage, J. E. Savage, J. A. Michael, J.D. Kibler, P. S. Powers, D. J. Lidke, S. Debray
2003, Engineering Geology (68) 67-101
Measurements of landslide movement made by global positioning system surveys and extensometers over a 3.5-year period show that the Slumgullion landslide in the San Juan Mountains of southwest Colorado moved throughout the monitoring period, but that daily velocities varied on a seasonal basis. Landslide velocities peaked in the early spring...
Partitioning of water flux in a Sierra Nevada ponderosa pine plantation
M.R. Kurpius, J.A. Panek, N.T. Nikolov, M. McKay, Allen H. Goldstein
2003, Agricultural and Forest Meteorology (117) 173-192
The weather patterns of the west side of the Sierra Nevada Mountains (cold, wet winters and hot, dry summers) strongly influence how water is partitioned between transpiration and evaporation and result in a specific strategy of water use by ponderosa pine trees (Pinus ponderosa) in this region. To investigate how...
Climate warming could reduce runoff significantly in New England, USA
T.G. Huntington
2003, Agricultural and Forest Meteorology (117) 193-201
The relation between mean annual temperature (MAT), mean annual precipitation (MAP) and evapotranspiration (ET) for 38 forested watersheds was determined to evaluate the potential increase in ET and resulting decrease in stream runoff that could occur following climate change and lengthening of the growing season. The watersheds were all predominantly...
Analysis of potential debris flow source areas on Mount Shasta, California, by using airborne and satellite remote sensing data
J.K. Crowley, B.E. Hubbard, J.C. Mars
2003, Remote Sensing of Environment (87) 345-358
Remote sensing data from NASA's Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) and the first spaceborne imaging spectrometer, Hyperion, show hydrothermally altered rocks mainly composed of natroalunite, kaolinite, cristobalite, and gypsum on both the Mount Shasta and Shastina cones. Field observations indicate that much of the visible altered rock consists of talus...
Budgeting postglacial sedimentation history on the Santa Cruz, California mid-continental shelf
E. E. Grossman, S.L. Eittreim, D.M. Hanes, M.E. Field, B. D. Edwards, S.J. Fallon, R. J. Anima
2003, Conference Paper, Oceans Conference record
High-resolution seismic reflection profiling and surface texture mapping of the central California continental shelf, reveal a prominent subsurface reflector interpreted as a low stand erosion surface and an overlying mudbelt that covers 421 km2 of the mid-shelf in depths of 40-90 m. Radiometric and sedimentologic analyses of samples from vibracores...
The saturated zone at Yucca Mountain: An overview of the characterization and assessment of the saturated zone as a barrier to potential radionuclide migration
A.-A. Eddebbarh, G.A. Zyvoloski, B.A. Robinson, E. M. Kwicklis, P.W. Reimus, B.W. Arnold, T. Corbet, S.P. Kuzio, C. Faunt
2003, Journal of Contaminant Hydrology (62-63) 477-493
The US Department of Energy is pursuing Yucca Mountain, Nevada, for the development of a geologic repository for the disposal of spent nuclear fuel and high-level radioactive waste, if the repository is able to meet applicable radiation protection standards established by the US Nuclear Regulatory Commission and the US Environmental...
Seasonal and spatial distribution of bacterial biomass and the percentage of viable cells in a reservoir of Alabama
T.E. Tietjen, R.G. Wetzel
2003, Journal of Plankton Research (25) 1521-1534
Spatial community dynamics of bacterioplankton were evaluated along the length of the former stream channel of Elledge Lake, a small reservoir in western Alabama. The reservoir was strongly stratified from April to October with up to a 10??C temperature difference across the 1 m deep metalimnion. Bacterial biomass was highest...
Interactions between dissolved organic matter and mercury in the Florida Everglades
G. Aiken, M. Haitzer, J. N. Ryan, K. Nagy, George Aiken
Boutron C.Ferrari C., editor(s)
2003, Journal De Physique. IV : JP (107) 29-32
Experiments were conducted using organic matter isolated from various surface waters in the Florida Everglades to study the interactions between dissolved organic matter (DOM) and Hg (II). Conditional distribution coefficients ( ), obtained using an equilibriurn dialysis ligand exchange method, were strongly affected by...
Influence of flow and temperature on survival of wild subyearling fall chinook salmon in the Snake River
W.P. Connor, H.L. Burge, J.R. Yearsley, T.C. Bjornn
2003, North American Journal of Fisheries Management (23) 362-375
Summer flow augmentation to increase the survival of wild subyearling fall chinook salmon Oncorhynchus tshawytscha is implemented annually to mitigate for the development of the hydropower system in the Snake River basin, but the efficacy of this practice has been disputed. We studied some of the factors affecting survival of...
Development of small carbonate banks on the south Florida platform margin: Response to sea level and climate change
David J. Mallinson, Albert C. Hine, Pamela Hallock, Stanley D. Locker, Eugene Shinn, David Naar, Brian Donahue, Douglas C. Weaver
2003, Marine Geology (199) 45-63
Geophysical and coring data from the Dry Tortugas, Tortugas Bank, and Riley’s Hump on the southwest Florida margin reveal the stratigraphic framework and growth history of these carbonate banks. The Holocene reefs of the Dry Tortugas and Tortugas Bank are approximately 14 and 10 m thick, respectively, and are situated...
Modeling Np and Pu transport with a surface complexation model and spatially variant sorption capacities: Implications for reactive transport modeling and performance assessments of nuclear waste disposal sites
P. D. Glynn
2003, Computers & Geosciences (29) 331-349
One-dimensional (1D) geochemical transport modeling is used to demonstrate the effects of speciation and sorption reactions on the ground-water transport of Np and Pu, two redox-sensitive elements. Earlier 1D simulations (Reardon, 1981) considered the kinetically limited dissolution of calcite and its effect on ion-exchange reactions (involving 90Sr, Ca, Na, Mg and...
