Earthquakes, March-April 1983
W. J. Person
1983, Earthquake Information Bulletin (USGS) (15) 189-194
March and April were quite active with widespread deaths and damage from earthquakes. There were two major (magnitude 7.0-7.9) earthquakes, one in the New Ireland region and the other in Costa Rica. The most devastating earthquake occurred in Colombia. deaths from earthquakes also occurred in Iran, Costa Rica, and Peru. The...
Late Holocene ice wedges near Fairbanks, Alaska, USA: Environmental setting and history of growth
T. D. Hamilton, T. A. Ager, S.W. Robinson
1983, Arctic and Alpine Research (15) 157-168
Test trenches excavated into muskeg near Fairbanks in 1969 exposed a polygonal network of active ice wedges. The wedges occur in peat that has accumulated since about 3500 yr BP and have grown episodically as the permafrost table fluctuated in response to fires, other local site conditions and perhaps regional...
Two examples of earthquake-hazard reduction in Southern California
W. J. Kockelman, C.C. Campbell
1983, Earthquake Information Bulletin (USGS) (15) 216-225
Seasonal food of juvenile lake trout in U.S. waters of Lake Ontario
Joseph H. Elrod
1983, Journal of Great Lakes Research (9) 396-402
Stomach contents of 3,554 lake trout (Salvelinus namaycush), 100 to 449 mm in total length, captured with bottom trawls during April through October 1978–81 along the south shore of Lake Ontario were examined. Invertebrates appeared to be an important food of lake trout less than 200 mm long but were...
Earthquake engineering in Peru
N.J Vargas
1983, Earthquake Information Bulletin (USGS) (15) 28-31
During the last decade, earthquake engineering research in Peru has been carried out at the Catholic University of Peru and at the Universidad Nacional de Ingeniera (UNI). The Geophysical Institute (IGP) under the auspices of the Organization of American States (OAS) has initiated in Peru other efforts in regional seismic...
Earthquakes; November-December 1982
W. J. Person
1983, Earthquake Information Bulletin (USGS) (15) 108-112
The months of November and December were quite active, seismically speaking, compared to the preceding months. The most devastating earthquake of the year occurred in Yemen on December 13 and killed hundreds of people. the largest earthquake of the year, a magnitude 7.7, occurred in the Pacific Tonga Islands on...
High-porosity Cenozoic carbonate rocks of South Florida: Progressive loss of porosity with depth
Robert B. Halley, James W. Schmoker
1983, AAPG Bulletin (67) 191-200
Porosity measurements by borehole gravity meter in subsurface Cenozoic carbonates of south Florida reveal an extremely porous mass of limestone and dolomite which is transitional in total pore volume between typical porosity values for modern carbonate sediments and ancient carbonate rocks. A persistent decrease of porosity with depth, similar to...
Sedimentology of Southwestern Roads region, U.S. Virgin Islands: origin and rate of sediment accumulation
Jack L. Kindinger, Ronald J. Miller, Charles W. Holmes
1983, Journal of Sedimentary Research (53) 439-447
Sand deposits on southern insular shelf of St. Thomas, U.S. Virgin Islands, were investigated to determine their origin, environmental processes and accumulation rates. Sea-floor samples show that the sand has been derived (in situ) mainly from calcareous algae and molluscs. Zonation of the dominant sand producers is related to the...
Talc in the suspended matter of the northwestern Atlantic
Lawrence J. Poppe, John C. Hathaway, Carol M. Parmenter
1983, Clays and Clay Minerals (31) 60-64
Knowledge of the distribution, concentration, and composition of suspended particulate matter in seawater is important to the understanding of sedimentation processes on the Continental Shelf. Because the surfaces of both organic and inorganic particles have high affinities for pollutants, such as certain trace metals, chlorinated hydrocarbons, and petroleum (Bothner et...
Furrowed outcrops of Eocene chalk on the lower continental slop offshore New Jersey
James M. Robb, John R. Kirby, John C. Hampson, Patricia R. Gibson, Barbara Hecker
1983, Geology (11) 182-186
A sea bottom of middle Eocene calcareous claystone cut by downslope-trending furrows was observed during an Alvin dive to the mouth of Berkeley Canyon on the continental slope off New Jersey. The furrows are 10 to 50 m apart, 4 to 13 m deep, linear, and nearly parallel in water depths of...
Sea-floor-mounted rotating side-scan sonar for making time-lapse sonographs
David M. Rubin, David S. McCulloch, Harry R. Hill
1983, Continental Shelf Research (1) 295-301
A rotating side-scan sonar system was designed to make time-lapse sonographs of a circular area of the sea floor. To construct the system, the transducers of a commercial side-scan system (frequency 105 kHz; pulse length 0.1 ms; horizontal beam width 1°; vertical beam width 20°; beam depressed 10° with respect...
delta18O variations in the Halimeda of Virgin Islands sands: evidence of cool water in the northeast Caribbean, late Holocene
Charles W. Holmes
1983, Journal of Sedimentary Research (53) 429-438
Halimeda segments from carbonate sands on the Virgin Islands platform have delta 18 O versus PDB isotopic values ranging from -0.3% to -1.3% (x = -0.9%). Modern Halimeda segments from the same area have a measured delta18 O ranging from -2.0% to -2.5% PDB (x = -2.15%), and the carbonate skeleton appears to...
Variation in survival and recovery rates of ring-necked ducks
Michael J. Conroy, Robert T. Eberhardt
1983, Journal of Wildlife Management (47) 127-137
Band recovery data were used to examine sex-specific, geographic, and temporal variations in survival and recovery rates of ring-necked ducks (Aythya collaris). Survival rates were higher (P < 0.05) for males than for females in the preseason-banded sample and in 2 of 3 postseason samples; recovery rates were higher (P...
Altitude of the top of the Matawan Group-Magothy Formation, Suffolk County, Long Island, New York
Richard K. Krulikas, E. J. Koszalka, Thomas P. Doriski
1983, Open-File Report 83-137
The Magothy aquifer, with its irregular surface and deeply eroded buried valleys, has become the major source of fresh water in most of Suffolk Country. With the availability of recent data from deep wells and test holes, refinement of the surface-altitude contours has been possible and resulted in substantial revision...
Migration and winter distributions of canvasbacks staging on the Upper Mississippi River
J.R. Serie, D.L. Trauger, D.E. Sharp
1983, Journal of Wildlife Management (47) 741-753
Fall and winter distribution patterns of canvasbacks (Aythya valisineria) staging on the upper Mississippi River near LaCrosse, Wisconsin (navigational Pools 7 and 8) and Keokuk, Iowa (Pool 19) were studied during 1973-77. Sightings and recoveries obtained from 1,488 color-marked males during 1973-75 and 3,789 banded males and females during 1973-77...
Water storage capacity of natural wetland depressions in the Devils Lake basin of North Dakota
A.P. Ludden, D.L. Frink, Douglas H. Johnson
1983, Journal of Soil and Water Conservation (38) 45-48
Photogrammetric mapping techniques were used to derive the water storage capacities of natural wetland depressions other than lakes in the Devils Lake Basin of North Dakota. Results from sample quarter-section areas were expanded to the entire basin. Depressions in the Devils Lake Basin have a maximum storage capacity of nearly...
Man against volcano : the eruption on Heimaey, Vestmannaeyjar, Iceland
Richard S. Williams Jr., James G. Moore
1983, Report
No abstract available....
Avian associations of the northern Great Plains grasslands
H.A. Kantrud, R.L. Kologiski
1983, Journal of Biogeography (10) 331-350
The grassland region of the northern Great Plains was divided into six broad subregions by application of an avian indicator species analysis to data obtained from 582 sample plots censused during the breeding season. Common, ubiquitous species and rare species had little classificatory value and were eliminated from the data...
Use of nearshore and estuarine areas by gray whales (Eschrichtius robustus) in the eastern Bering Sea
Robert E. Gill Jr., John D. Hall
1983, Arctic (36) 275-281
During spring aerial surveys of the coast of the southeastern Bering Sea significant numbers of gray whales were seen in nearshore waters along the north side of the Alaska Peninsula. Many (50-80%) of these animals were observed surfacing with mud trails or lying on their sides, characteristics both associated with...
Characteristic analysis-1981: Final program and a possible discovery
R.B. McCammon, J.M. Botbol, R. Sinding-Larsen, R. W. Bowen
1983, Journal of the International Association for Mathematical Geology (15) 59-83
The latest ornewest version of thecharacteristicanalysis (NCHARAN)computer program offers the exploration geologist a wide variety of options for integrating regionalized multivariate data. The options include the selection of regional cells for characterizing deposit models, the selection of variables that constitute the models, and the choice of logical combinations of variables...
Factors affecting dietary requirement and deficiency signs of L-tryptophan in rainbow trout
H. A. Poston, G. L. Rumsey
1983, Journal of Nutrition (113) 2568-2577
Two experiments were conducted to determine the concentration of dietary tryptophan needed for optimal growth and survival of fingerling rainbow trout (Salmo gairdneri), to characterize signs of tryptophan deficiency, and to ascertain the effects of niacin on deficiency signs. Test diets containing either hydrolyzed or intact casein were fed with...
Refractive index determination using the central focal masking technique with dispersion colors.
R.E. Wilcox
1983, American Mineralogist (68) 1226-1236
The procedures, precision, advantages and limitations of central focal masking ("dispersion staining'), a technique for determining the refractive indices of microfragments by the immersion method and for distinguishing between minerals in an immersion mount, are described. -J.A.Z....
Iron disulfide minerals and the genesis of roll-type uranium deposits
R. L. Reynolds, M. B. Goldhaber
1983, Economic Geology (78) 105-120
FeS 2 minerals in host rocks for deposits that contain fossil vegetal (organic) matter differ in abundance, distribution, texture, and sulfur isotopic ratios from FeS 2 minerals in host rocks for deposits that do not contain fossil vegetal matter. In three South Texas deposits lacking such organic matter, preore FeS 2 is dominantly euhedral pyrite which...
Orickite and coyoteite, two new sulfide minerals from Coyote Peak, Humboldt County, California.
Richard C. Erd, G.K. Czamanske
1983, American Mineralogist (68) 245-254
Minute quantities of orickite and coyoteite occur with rare alkali iron sulphides in a mafic alkalic diatreme near Orick, Humboldt County. Orickite, NaxKyCu0.95Fe1.06zH2O (x,y < 0.03, z < 0.5), is hexagonal, a 3.695, c 6.16 A, D 4.212 g/cm3, Z = 4. The strongest XRD reflections are 3.08(100), 3.20(90), 2.84(60),...
40Ar/39Ar and U-Th-Pb dating of separated clasts from the Abee E4 chondrite
D.D. Bogard, D.M. Unruh, M. Tatsumoto
1983, Earth and Planetary Science Letters (62) 132-146
Determinations of40Ar/39Ar and U-Th-Pb are reported for three clasts from the Abee (E4) enstatite chondrite, which has been the object of extensive consortium investigations. The clasts give40Ar/39Ar plateau ages and/or maximum ages of 4.5 Gy, whereas two of the clasts give...
