Processing and attenuation of noise in deep seismic-reflection data from the Gulf of Maine
D. R. Hutchinson, Myung W. Lee
1989, Marine Geophysical Research (11) 51-67
The U.S. Geological Survey deep crustal studies reflection profile across the Gulf of Maine off southeastern New England was affected by three sources of noise: side-scattered noise, multiples, and 20-Hz whale sounds. The special processing most effective in minimizing this noise consisted of a combination of frequency-wavenumber (F-K) filtering, predictive...
A terracing operator for physical property mapping with potential field data
L. Cordell, A. E. McCafferty
1989, Geophysics (54) 621-634
The terracing operator works iteratively on gravity or magnetic data, using the sense of the measured field's local curvature, to produce a field comprised of uniform domains separated by abrupt domain boundaries. The result is crudely proportional to a physical-property function defined in one (profile case) or two (map case)...
Whitings, a sedimentologic dilemma
E.A. Shinn, R.P. Steinen, B. H. Lidz, Peter K. Swart
1989, Journal of Sedimentary Petrology (59) 147-161
Whitings, drifting clouds of water, milky because of suspended carbonate, have been claimed to originate from either the action of bottom-feeding fish or direct precipitation of calcium carbonate. Five cruises during different seasons were made to the Great Bahama Bank to collect data...
Absence of Altonian glaciation in Illinois
B. Brandon Curry
1989, Quaternary Research (31) 1-13
Illinois was free of glacier ice from about 130,000 to 25,000 yr B.P. Deposits of this time interval in northeastern Illinois, represented by core samples from test-hole ISGS S-30, are composed of leached, nonglacigenic, stratified, or pedoturbated silty sediments that typically are organic-rich and pedogenically modified. These deposits overlie the...
Note
D.M. Moore, R.E. Hughes
1989, Catalysis Letters (2) 71-72
[No abstract available]...
Sedimentological effects of strong southward flow in the Straits of Florida
W.D. Gardner, M.J. Richardson, D.A. Cacchione
1989, Marine Geology (86) 155-180
Periodic southerly currents along the western side of the Straits of Florida are sufficiently strong to erode the seafloor and create large sand waves and coral mounds up to several meters high. Mapping with side-looking sonar and visual observations from the Nuclear Research Submarine NR-1 show that the sand waves...
Geology of the Ulugh Muztagh area, northern Tibet
B.C. Burchfiel, P. Molnar, Ziyun Zhao, K’uangyi Liang, Shuji Wang, Minmin Huang, J. Sutter
1989, Earth and Planetary Science Letters (94) 57-70
Within the Ulugh Muztagh area, north central Tibet, an east-west-trending ophiolitic melange marks a suture that apparently was formed during a late Triassic or slightly younger collision between a continental fragment to the south and the rest of Asia. The southern continental fragment carries a thick sequence of upper Triassic...
Preliminary assessments of the occurrence and effects of utilization of sand and aggregate resources of the Louisiana inner shelf
J.R. Suter, J. Mossa, S. Penland
1989, Marine Geology (90) 31-37
Louisiana is experiencing the most critical coastal erosion and land loss problem in the United States. Shoreline erosion rates exceed 6 m/yr in more than 80% of the Louisiana coastal zone and can be up to 50 m/yr in areas impacted by hurricanes. The barrier islands have decreased in...
Origin of Sr, Nd and Pb isotopic systematics in high-Sr basalts from central Arizona
J.H. Wittke, D. Smith, J. L. Wooden
1989, Contributions to Mineralogy and Petrology (101) 57-68
Alkalic and tholeiitic basalts were erupted in the central Arizona Transition Zone during Miocene-Pliocene time before and after regional faulting. The alkalic lava types differ from the subalkaline lavas in Sr, Nd and Pb isotopic ratios and trace element ratios and, despite close temporal and spatial relationships, the two types...
Use of the variable gain settings on SPOT
P.S. Chavez Jr.
1989, Photogrammetric Engineering and Remote Sensing (55) 195-201
Often the brightness or digital number (DN) range of satellite image data is less than optimal and uses only a portion of the available values (0 to 255) because the range of reflectance values is small. Most imaging systems have been designed with only two gain settings, normal and high....
Thermodynamics of magnesian calcite solid-solutions at 25°C and 1 atm total pressure
Eurybiades Busenberg, Niel Plummer
1989, Geochimica et Cosmochimica Acta (53) 1189-1208
The stability of magnesian calcites was reexamined, and new results are presented for 28 natural inorganic, 12 biogenic, and 32 synthetic magnesian calcites. The magnesian calcite solid-solutions were separated into two groups on the basis of differences in stoichiometric solubility and other physical and chemical properties. Group I consists...
New fault picture points toward San Francisco Bay area earthquakes
R. A. Kerr
1989, Earthquakes & Volcanoes (USGS) (21) 116-120
Recent earthquakes and a new way of looking at faults suggest that damaging earthquakes are closing in on the San Francisco area. Earthquakes Awareness Week 1989 in northern California started off with a bang on Monday, 3 April, when a magnitude 4.8 earthquake struck 15 kilometers northeast of San Jose....
Hydrologic studies of wetlands in the northern prairie
Thomas C. Winter
1989, Book chapter, Northern prairie wetlands
No abstract available....
Measuring the size of an earthquake
W. Spence, S.A. Sipkin, G. L. Choy
1989, Earthquakes & Volcanoes (USGS) (21) 58-63
Earthquakes range broadly in size. A rock-burst in an Idaho silver mine may involve the fracture of 1 meter of rock; the 1965 Rat Island earthquake in the Aleutian arc involved a 650-kilometer length of the Earth's crust. Earthquakes can be even smaller and even larger. If an earthquake is...
Taking the pulse of the San Andreas Fault
R. A. Kerr
1989, Earthquakes & Volcanoes (USGS) (21) 112-115
The ninth of January, 1989, was the 32nd anniversary of the great southern California earthquake of 1857. the latest research shows that, on average, at least part of the section of the San Andreas fault that broke then should break again this year. But the same research suggests that the fault's...
Evaluating the intensity of United States earthquakes
C. W. Stover
1989, Earthquakes & Volcanoes (USGS) (21) 45-53
Spatial patterns of aftershocks of shallow focus earthquakes in California and implications for deep focus earthquakes
A.J. Michael
1989, Journal of Geophysical Research Solid Earth (94) 5615-5626
Previous workers have pioneered statistical techniques to study the spatial distribution of aftershocks with respect to the focal mechanism of the main shock. Application of these techniques to deep focus earthquakes failed to show clustering of aftershocks near the nodal planes of the main shocks. To better understand the behavior...
Potentiometric surface of the upper Cape Fear aquifer in the central coastal plain of North Carolina, December 1986
M. D. Winner Jr., William L. Lyke, Allen R. Brockman
1989, Water-Resources Investigations Report 87-4235
Water-level measurements were made in 84 wells open to the upper Cape Fear aquifer at the end of 1986 to determine the configuration of its potentiometric surface over an area of approximately 5,500 sq mi. The major feature of the potentiometric surface is the development of a large, almost circular...
Cytopathology and coagulopathy associated with viral erythrocytic necrosis in chum salmon
John R. MacMillian, D. Mulcahy, M.L. Landolt
1989, Journal of Aquatic Animal Health (1) 255-262
The 8-month cytopathologic progression of viral erythrocytic necrosis (VEN) disease in chum salmon Oncorhynchus keta is described. Single to multiple acidophilic, cytoplasmic viral inclusion bodies developed first in mature erythrocytes and then, within 1–2 months, all morphologically identifiable hemopoietic cell types contained VEN inclusions. Cytologic analysis indicated that multinucleate giant...
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...
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...
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...
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...
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,...
Immunostimulation by levamisole in rainbow trout (Salmo gairdneri) in vivo
D. P. Anderson, A.K. Siwicki, O. W. Dixon, E. F. Lizzio
W. Ahne, E. Kurstak, editor(s)
1989, Book chapter, Viruses of Lower Vertebrates
No abstract available at this time...
