Conference Papers
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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First results of a deep tow CHIRP sonar seafloor imaging system First results of a deep tow CHIRP sonar seafloor imaging system
The latest and most innovative technology has been applied towards the development of a full-ocean depth multi-sensor sonar system using linear swept-FM (Chirp) technology. The seafloor imaging system (SIS- 7000) described herein uses Chirp sidescan sonar to provide high resolution imagery at long range, and Chirp subbottom sonar to provide high resolution profiles in both the near...
Authors
M. Parent, Changle Fang, Thomas F. O’Brien, William W. Danforth
A Geographic Information System procedure to quantify drainage-basin characteristics A Geographic Information System procedure to quantify drainage-basin characteristics
The Basin Characteristics System (BCS) has been developed to quantify characteristics of a drainage basin. The first of four main BCS processing steps creates four geographic information system (GIS) digital maps representing the drainage divide, the drainage network, elevation contours, and the basin length. The drainage divide and basin length are manually digitized from 1:250,000...
Authors
David A. Eash
GIS mapping of earthquake ground shaking in San Francisco, California GIS mapping of earthquake ground shaking in San Francisco, California
Severe earthquakes of the last decade in Mexico, Armenia, and the United States have reemphasized the importance of local geologic site conditions in estimating damage and consequent losses. Recent advances in geographic information system (GIS) technology have created new opportunities for maintaining and integrating extensive spatial databases for applications in seismic hazard...
Authors
S.A. King, Anne S. Kiremidjian, Roger D. Borcherdt, Carl M. Wentworth
Measurement of scour at selected bridges in New York Measurement of scour at selected bridges in New York
No abstract available
Authors
G.K. Butch
Synthesis of Cretaceous/fertiary boundary studies at Hole 807C Synthesis of Cretaceous/fertiary boundary studies at Hole 807C
Paleontological, stable isotopic, trace elemental abundance, and magnetostratigraphic studies have been performed on limestones spanning the Cretaceous/Tertiary boundary transition at Ocean Drilling Program (ODP) Hole 807C. Paleontological evidence exists for considerable resedimentation, which we attribute to the fact that Hole 807C is located in a basement graben. Age estimates based...
Authors
Richard M. Corfield, William V. Sliter, Isabella Premolia Silva, John A. Tarduno, Roman A. Schmitt, Yun-Gang Liu, Sherwood W. Wise, Shaozhi Mao, Julie E. Cartlidge, Wolf H. Berger
The influence of long term climate change on net titration at Yucca Mountain, Nevada The influence of long term climate change on net titration at Yucca Mountain, Nevada
No abstract available
Authors
A. L. Flint, L. E. Flint, J.A. Hevesi
A geographic information systems approach to the analysis of contaminants in Galveston Bay A geographic information systems approach to the analysis of contaminants in Galveston Bay
No abstract available.
Authors
Marcia McNiff, P.F. Roscigno, Wei Ji
A matter of scale: damage from Hurricane Hugo (1989) to U.S. Virgin Islands reefs at the colony, community and whole reef level A matter of scale: damage from Hurricane Hugo (1989) to U.S. Virgin Islands reefs at the colony, community and whole reef level
Studies at Buck Island Reef National Monument (St. Croix) and Virgin Islands National Park (St. John) by scientists in the U.S. National Park Service Coral Reef Assessment Program re- vealed the effects of Humcane Hugo on individual coral species, community parameters, and overall reef structure. Effects of the storm varied with depth, coral species, location relative to the storm path...
Authors
Caroline S. Rogers
The effects of ingested plastic on growth and survival of albatross chicks The effects of ingested plastic on growth and survival of albatross chicks
We studied the effects of ingested plastic on the growth and survival of chicks of Laysan Albatrosses Diomedea immutabilis and Black-footed albatrosses D. nigripes on Midway Atoll during the nesting seasons of 1986 and 1987. Weights and proventricular contents of the chicks were determined periodically through the nesting cycle. Large (>22 cm1)volumes of plastic were present in the...
Authors
Paul R. Sievert, Louis Sileo
Using gis and image processing technology to assist wetland planning, protection, and restoration in coastal Louisiana Using gis and image processing technology to assist wetland planning, protection, and restoration in coastal Louisiana
No abstract available.
Authors
John Barras, James B. Johnston, Craig Johnson
234U/238U as a ground-water tracer, SW Nevada-SE California 234U/238U as a ground-water tracer, SW Nevada-SE California
The 234U/238U ratio of uranium in oxidizing ground waters is potentially an excellent ground-water tracer because of its high solubility and insensitivity to chemical reactions. Moreover, recent advances in analytical capability have made possible very precise uranium-isotopic analyses on modest (approx.100 ml) amounts of normal ground water. Preliminary results on waters from SW Nevada...
Authors
K.R. Ludwig, Z. E. Peterman, K. R. Simmons, E. D. Gutentag