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Page 4923, results 123051 - 123075

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Eastern Gulf of Alaska seismicity: Annual report to the National Oceanic and Atmospheric Administration for April 1, 1980, through March 31, 1981
Christopher D. Stephens, John C. Lahr, John A. Rogers
1981, Open-File Report 81-897
The objective of this research is to collect and analyze data on earthquake activity in the northeast Gulf of Alaska (NEGOA) and adjacent onshore areas in order to develop a better regional seismotectonic model and more accurately assess the earthquake potential. This information is critical to the establishment of criteria...
Composition of tidal flat sediments, Willapa Bay, Washington
Gary W. Hill, John L. Chinn
1981, Open-File Report 81-272
The purpose of this study was to characterize the modern sediments of sandy tidal flats in Willapa Bay, Washington based on their composition.Generally, clay comprises less than five percent of the sediment. Clay content increases upslope and up-estuary. Principal clay minerals are montmorillanite, illite, and chlorite; two clay mineral suites...
Crustal deformation observatory: Part B, precision geodesy
Arthur G. Sylvester
1981, Open-File Report 81-230
The primary purpose of this investigation this past year was to establish and monitor a precise leveling array at Pinon Flat Geophysical Observatory to monitor tilt strain. The leveling array is one of several strain measurement techniques established at the observatory by several investigators for side-byside testing. Precise leveling is...
Preliminary water-quality assessment of the upper White River near Indianapolis, Marion County, Indiana
David J. Wangsness, Stephen E. Eikenberry, William G. Wilber, Charles G. Crawford
1981, Open-File Report 81-408
The White River Park Commission is planning the development of park facilities along the White River through Indianapolis. A key element in the planning is the determination of whether water quality of the river is suitable for recreation. A preliminary water-quality assessment of the river in Indianapolis on August 4-5,...
Hydrologic data for urban studies in the Austin, Texas, metropolitan area, 1979
R.M. Slade, M.E. Dorsey, J.D. Gordon, R.N. Mitchell, J.L. Gaylord
1981, Open-File Report 81-628
Hydrologic investigations of urban watersheds in Texas were begun by theU.S. Geological Survey in 1954. Studies are now in progress in Austin, Houston, and San Antonio. Studies have been completed in the Dallas and Fort Worth areas.The Geological Survey, in cooperation with the Texas Department of Water Resources, began hydrologic...
Distribution of benthic chlorophyll in San Francisco Bay, California, February 1980 - February 1981
Janet Kay Thompson, Frederic H. Nichols, Sally M. Wienke
1981, Open-File Report 81-1134
Benthic microalgae biomass (chlorophyll a) data from San Francisco Bay are presented for the period February 1980 through February 1981. Benthic chlorophyll a was sampled throughout the bay (maximum of 54 stations) at bimonthly intervals and at monthly intervals at up to 14 stations in the southern bay. Ancillary data...
Appearance and water quality of turbidity plumes created by dredging in Tampa Bay, Florida
Carl R. Goodwin, D.M. Michaelis
1981, Open-File Report 81-541
Turbidity plumes in Tampa Bay, Florida, were monitored during ship-channel dredging operations from February 1977 to August 1978 to document plume appearance and water quality, evaluate plume influence on the characteristics of Tampa Bay water, and provide a basis for transferring the information to other areas having generally similar sediment,...
Tracing ground-water movement by using the stable isotopes of oxygen and hydrogen, upper Penitencia Creek alluvial fan, Santa Clara Valley, California
K. S. Muir, Tyler B. Coplen
1981, Water Supply Paper 2075
Starting in 1965 the Santa Clara Valley Water District began importing about i00,000 acre-feet per year of northern California water. About one-half of this water was used to artificially recharge the Upper Penitencia Creek alluvial fan in Santa Clara Valley. In order to determine the relative amounts of local ground...