Short note; Detectability levels for central induction transient soundings
David V. Fitterman
1989, Geophysics (54) 127-129
A question usually asked during the planning of a transient sounding survey is, "Can information useful to solving the geologic problem at hand be obtained from the measurements?" This question is usually answered by constructing a geologic model for the survey area based upon the best available information to determine...
Analysis of chlorinated organic compounds in estuarine biota and sediments by chemical ionization tandem mass spectrometry
C.E. Rostad, W. E. Pereira
1989, Biological Mass Spectrometry (18) 464-470
Complex sample matrices of estuarine biota tissue and bed sediment extracts were analyzed for selected chlorinated compounds. By using gas chromatography/positive chemical ionization/tandem mass spectrometry, the coeluting interferences present in gas chromatography/electron ionization mass spectrometry were eliminated in the biota tissue and bed sediment extracts. The...
Pre-earthquake displacement and triggered displacement on the Imperial fault associated with the Superstition Hills earthquake of 24 November 1987
R. V. Sharp
1989, Bulletin of the Seismological Society of America (79) 466-479
Two right-lateral slip events, about 3 weeks apart in November 1987, broke the surface discontinuously along probably similar, nearly 20 km lengths of the northern Imperial fault. The first displacement, at about the beginning of November, was accompanied by a surface tilt representing deep vertical motion or distributed strain. This...
Accounting for intracell flow in models with emphasis on water table recharge and stream-aquifer interaction: 2. A procedure
Donald G. Jorgensen, Donald C. Signor, Jeffrey L. Imes
1989, Water Resources Research (25) 677-684
Intercepted intracell flow, especially if cell includes water table recharge and a stream ((sink), can result in significant model error if not accounted for. A procedure utilizing net flow per cell (Fn) that accounts for intercepted intracell flow can be used for both steady state and transient simulations. Germane to...
River Valley pluton, Ontario: A late-Archean/early-Proterozoic anorthositic intrusion in the Grenville Province
L.D. Ashwal, J. L. Wooden
1989, Geochimica et Cosmochimica Acta (53) 633-641
The River Valley pluton is a ca. 100 km2 body of anorthositic and gabbroic rocks located about 50 km northeast of Sudbury, Ontario. The pluton is situated entirely within the Grenville Province, but its western margin is a series of imbricate thrust faults associated with the Grenville Front Tectonic Zone. It is...
Geochemical controls of vanadium accumulation in fossil fuels
G. N. Breit, R. B. Wanty
1989, Conference Paper, American Chemical Society, Division of Petroleum Chemistry, Preprints
High vanadium contents in petroleum and other fossil fuels have been attributed to organic-matter type, organisms, volcanic emanations, diffusion of sea water, and epigenetic enrichment. However, these factors are inadequate to account for the high abundance of vanadium in some fossil fuels and the paucity in others. By examining vanadium...
Estimation of strong ground motions from hypothetical earthquakes on the Cascadia subduction zone, Pacific Northwest
T. H. Heaton, S.H. Hartzell
1989, Pure and Applied Geophysics PAGEOPH (129) 131-201
Strong ground motions are estimated for the Pacific Northwest assuming that large shallow earthquakes, similar to those experienced in southern Chile, southwestern Japan, and Colombia, may also occur on the Cascadia subduction zone. Fifty-six strong motion recordings for twenty-five subduction earthquakes of Ms???7.0 are used to estimate the response spectra...
Spatial and temporal variability in South San Francisco Bay (USA). II. Temporal changes in salinity, suspended sediments, and phytoplankton biomass and productivity over tidal time scales
J. E. Cloern, T.M. Powell, L.M. Huzzey
1989, Estuarine, Coastal and Shelf Science (28) 599-613
Short-term variability of a conservative quantity (salinity) and two nonconservative quantities (chlorophyll a, suspended particulate matter) was measured across a sampling grid in the South San Francisco Bay estuary. Surface measurements were made every 2 h at each of 29 (or 38) sites,...
Introduction to the hydrogeochemical investigations within the International Stripa Project
D. Kirk Nordstrom, T. Olsson, L. Carlsson, P. Fritz
1989, Geochimica et Cosmochimica Acta (53) 1717-1726
The International Stripa Project (1980-1990) has sponsored hydrogeochemical investigations at several subsurface drillholes in the granitic portion of an abandoned iron ore mine, central Sweden. The purpose has been to advance our understanding of geochemical processes in crystalline bedrock that may affect the safety assessment of high-level radioactive waste repositories....
Field measurements of dry deposition to spruce foliage and petri dishes in the Black Forest, F.R.G.
J. B. Shanley
1989, Atmospheric Environment (23) 403-414
Dry deposition fluxes of Ca2+, Mg2+ , K+, Mn2+, Pb2+ and SO2−4 to spruce foliage and petri dishes were measured in two high-elevation sites ( > 900 m) in the southern Black Forest, F.R.G., during 12 periods (2–7 days, each) from mid-September to mid-November, 1983, In situ extraction of deposited material from small spruce branches...
Three-dimensional records of surface displacement on the Superstition Hills fault zone associated with the earthquakes of 24 November 1987
R. V. Sharp, J.L. Saxton
1989, Bulletin of the Seismological Society of America (79) 376-389
Seven quadrilaterals, constructed at broadly distributed points on surface breaks within the Superstition Hills fault zone, were repeatedly remeasured after the pair of 24 November 1987 earthquakes to monitor the growing surface displacement. Changes in the dimensions of the quadrilaterals are recalculated to right-lateral and extensional components at millimeter resolution,...
An introduction to quiet daily geomagnetic fields
W.H. Campbell
1989, Pure and Applied Geophysics PAGEOPH (131) 315-331
On days that are quiet with respect to solar-terrestrial activity phenomena, the geomagnetic field has variations, tens of gamma in size, with major spectral components at about 24, 12, 8, and 6 hr in period. These quiet daily field variations are primarily due to the dynamo currents flowing in the...
Analysis of accuracy of approximate, simultaneous, nonlinear confidence intervals on hydraulic heads in analytical and numerical test cases
M. C. Hill
1989, Water Resources Research (25) 177-190
Inaccuracies in parameter values, parameterization, stresses, and boundary conditions of analytical solutions and numerical models of groundwater flow produce errors in simulated hydraulic heads. These errors can be quantified in terms of approximate, simultaneous, nonlinear confidence intervals presented in the literature. Approximate confidence intervals can be applied in both error...
The hydrologic reponses to development in regional sedimentary aquifers
R.H. Johnston
1989, Groundwater (27) 316-322
The hydrologic response to development of three of the most heavily pumped sedimentary aquifer systems in the United States is similar in some aspects and different in others. In the semiarid West, an unconfined sand aquifer and a confined sand and clay aquifer system have...
Strong correlation of major earthquakes with solid-earth tides in part of the eastern United States
R.E. Weems, W.H. Perry Jr.
1989, Geology (17) 661-664
East of the eastern American continental divide and south of fat 42.5°N, moderate to large historic earthquakes correlate strongly with times of high and low solid-earth tides. This effect is most pronounced when solar declination lies between 17°N and 17°S. Significant correlations also...
Modern sedimentary environments in a large tidal estuary, Delaware Bay
H.J. Knebel
1989, Marine Geology (86) 119-136
Data from an extensive grid of sidescan-sonar records reveal the distribution of sedimentary environments in the large, tidally dominated Delaware Bay estuary. Bathymetric features of the estuary include large tidal channels under the relatively deep (> 10 m water depth) central...
Mineralogy and paragenesis of the McAllister Sn-Ta-bearing pegmatite, Coosa County, Alabama
Eugene E. Foord, Robert B. Cook
1989, Canadian Mineralogist (27) 93-105
The McAllister Sn-Ta deposit (Alabama) is localized in a complex pegmatite that contains large zones of mineralized late-stage replacement-type saccharoidal albite and nearly monomineralic muscovite 'greisen-like' pipes. The dyke is at least 450 m long and averages approximately 9 m in thickness. At least two 'greisen-like' pipes, as much as...
Convergent radial dispersion: A Laplace transform solution for aquifer tracer testing
Allen F. Moench
1989, Water Resources Research (25) 439-447
A Laplace transform solution was obtained for the injection of a tracer in a well situated in a homogeneous aquifer where steady, horizontal, radially convergent flow has been established due to pumping at a second well. The standard advection-dispersion equation for mass transfer was used as the controlling equation. For...
Trace metal associations in the water column of South San Francisco Bay, California
J.S. Kuwabara, Cecily C.Y. Chang, J. E. Cloern, T. L. Fries, J.A. Davis, S. N. Luoma
1989, Estuarine, Coastal and Shelf Science (28) 307-325
Spatial distributions of copper (Cu), zinc (Zn) and cadmium (Cd) were followed along a longitudinal gradient of dissolved organic carbon (DOC) in South San Francisco Bay (herein referred to as the South Bay). Dissolved Cu, Zn and Cd concentrations ranged from 24 to...
Pockmarks in the floor of Penobscot Bay, Maine
Kathryn M. Scanlon, Harley J. Knebel
1989, Geo-Marine Letters (9) 53-58
Hundreds of depressions (pockmarks) were found within a 40 square kilometer area of the sea floor near the head of Penobscot Bay, Maine. These roughly circular depressions range in diameter from 10 to 300 meters and extend as much as 30 meters below the surrounding sea floor. The pockmarks have...
Uranium-series nuclides in the Golden fault, Colorado, U.S.A.: Dating latest fault displacement and measuring recent uptake of radionuclides by fault-zone materials
Barney J. Szabo, J.N. Rosholt
1989, Applied Geochemistry (4) 177-182
Concentrations and isotopic ratios of U, Th and Ra were measured in a fault zone near Golden, Colorado where major displacement occurred between about 190 and 615 ka. Faulting created new surfaces for leaching and provided the pathways for U-rich ground...
The geology, botany and chemistry of selected peat-forming environments from temperate and tropical latitudes
C. C. Cameron, J.S. Esterle, C.A. Palmer
1989, International Journal of Coal Geology (12) 105-156
Peat has been studied in several geologic settings: (1) glaciated terrain in cold temperate Maine and Minnesota, U.S.A.; (2) an island in the Atlantic Ocean off the coast of Maine, where sea level is rising; (3) the warm temperate U.S. Atlantic...
A note on the occurrence of allocrioceras billinghursti Klinger, 1976 (Cretaceous Ammonoidea) in the Middle Turonian of the Western Interior of the United States
W. A. Cobban, W. J. Kennedy
1989, Cretaceous Research (10) 173-175
No abstract available....
Spatial and temporal variability in South San Francisco Bay (USA). I. Horizontal distributions of salinity, suspended sediments, and phytoplankton biomass and productivity
T.M. Powell, J. E. Cloern, L.M. Huzzey
1989, Estuarine, Coastal and Shelf Science (28) 583-597
The horizontal pattern of mesoscale (1–4 km) variability in salinity was a poor predictor of mesoscale patterns in chlorophyll a, suspended particulate matter, and daily primary productivity in the South San Francisco Bay estuary during spring 1987. The tidally-averaged salinity distribution varied over weekly time scales, reflecting inputs of freshwater as...
A thrust-ridge paleodepositional model for the Upper Freeport coal bed and associated clastic facies, Upper Potomac coal field, Appalachian basin, U.S.A.
Edward S. Belt, P.C. Lyons
1989, International Journal of Coal Geology (12) 293-328
A blind-thrust-ridge model is proposed to explain the lack of coarse clastic material in the vast minable Upper Freeport coal bed (UF). This coal bed contains only fine elastic partings and is overlain by regionally extensive, closely spaced channel-belt deposits in...
