The effect of snowmelt on the water quality of Filson Creek and Omaday Lake, northeastern Minnesota
D. I. Siegel
1981, Water Resources Research (17) 238-242
Sulfate concentration and pH were determined in surface water, groundwater, and precipitation samples collected in the Filson Creek watershed to evaluate the sources of sulfate in Filson Creek. During and immediately after snowmelt, sulfate concentrations in Filson Creek increased from about 2 to 14 mg/l. Concurrently, H+ ion activity increased from an...
The Great Tumaco, Colombia earthquake of 12 December 1979
Darrell G. Herd, T. L. Youd, H. Meyer, C.J.L. Arango, W. J. Person, C. Mendoza
1981, Science (211) 441-445
Southwestern Colombia and northern Ecuador were shaken by a shallow-focus earthquake on 12 December 1979. The magnitude 8 shock, located near Tumaco, Colombia, was the largest in northwestern South America since 1942 and had been forecast to fill a seismic gap. Thrust faulting occurred on a 280-...
A Pleistocene sand sea on the Alaskan Arctic Coastal Plain
L. D. Carter
1981, Science (211) 381-383
A ridge and thermokarst-basin landscape that is strikingly portrayed in Landsat winter imagery consists of large Pleistocene dunes that have been modified by younger eolian activity and thermokarst processes. This is the most extensive area of large stabilized dunes yet reported in the North American Arctic; the...
Quaternary climates and sea levels of the U.S. Atlantic Coastal Plain
T. M. Cronin, Barney J. Szabo, T. A. Ager, J. E. Hazel, J. P. Owens
1981, Science (211) 233-240
Uranium-series dating of corals from marine deposits of the U.S. Atlantic Coastal Plain coupled with paleoclimatic reconstructions based on ostracode (marine) and pollen (continent) data document at least five relatively warm intervals during the last 500,000 years. On the basis of multiple paleoenvironmental criteria, we determined relative...
Depletion sampling in stream ecosystems: assumptions and techniques
Robert F. Raleigh, Cathleen Short
1981, Progressive Fish-Culturist (43) 115-120
Reliable fish and invertebrate population estimates depend on meeting the assumptions of the methods used for organism capture and data analysis. A review of several population estimation studies has indicated that assumptions of the removal method for population estimation are often violated. This paper outlines (1) procedures to assist in...
IASPEI workshop: Seismic modeling of laterally varying structures
Walter D. Mooney
1981, Eos, Transactions, American Geophysical Union (62) 18-19
During the past 10 years, significant progress has been made in the methods of collection and analysis of seismic reflection and refraction data. This progress has led to the development of new models for the structure and composition of the earth's crust, based on sophisticated analysis of...
The geologic history of the Mid-Pacific Mountains in the central North Pacific Ocean; A synthesis of deep-sea drilling studies
Jorn Thiede, Walter E. Dean, David K. Rea, T.L. Vallier, Charles Adelseck
1981, Initial Reports of the D.S.D.P. (62) 1073-1120
The Mid-Pacific Mountains constitute one of the largest aseismic rises in the central North Pacific Ocean. They have been generated by mid-plate volcanic events prior to Barremian time, but their volcanic activity continued through the remainder of the Cretaceous. Evidence of the latest stages of this volcanism are the trachytic...
The geology of Hess Rise, central north Pacific Ocean
T. L. Vallier, David K. Rea, Walter E. Dean, Jorn Thiede, Charles Adelseck
1981, Initial Reports of the D.S.D.P. (62) 1031-1072
The geology of Hess Rise is interpreted from studies of morphology and structure, igneous petrology, sediment lithofacies, seismic stratigraphy, and paleoenvironments. Hess Rise probably formed at a triple junction, between 116 and 95 m.y. ago, in the equatorial zone of the southern hemisphere. A large archipelago, formed by volcanism, subsequently...
Multichannel seismic evidence bearing on the origin of Bowers Ridge, Bering Sea
Alan K. Cooper, Michael S. Marlow, Z. Ben-Avraham
1981, GSA Bulletin (92) 474-484
Bowers Ridge is a large, arcuate sub-marine ridge that extends north and west from the Aleutian Ridge and separates the abyssal Aleutian and Bowers Basins in the Bering Sea. Two multichannel seismic-reflection lines recorded in 1976 over Bowers Ridge and the adjacent basins confirm the existence of 8- to 10-km-thick...
Early evolution of the Bering Sea by collision of oceanic rises and North Pacific subduction zones
Z. Ben-Avraham, Alan K. Cooper
1981, GSA Bulletin (92) 485-495
Three major bathymetric features exist in the Bering Sea: Shirshov Ridge, Bowers Ridge, and Umnak Plateau. New refraction data over Umnak Plateau and previous geophysical data across Bowers Ridge indicate that a thickened welt of crustal material is present beneath both features. The crustal structure is transitional between oceanic and...
Strain on the San Andreas fault near Palmdale, California: Rapid, aseismic change
J.C. Savage, W.H. Prescott, M. Lisowski, N.E. King
1981, Science (211) 56-58
Frequently repeated strain measurements near Palmdale, California, during the period from 1971 through 1980 indicate that, in addition to a uniform accumulation of right-lateral shear strain (engineering shear, 0.35 microradian per year) across the San Andreas fault, a 1-microstrain contraction perpendicular to the fault that accumulated gradually...
Water resources data for Washington
Water Resources Division, U.S. Geological Survey
1981, Report
Water resources data
Water Resources Division, U.S. Geological Survey
1981, Report, U.S. Geological Survey water-supply paper
No abstract available....
Water resources data
Water Resources Division, U.S. Geological Survey
1981, Report, U.S. Geological Survey water-supply paper
No abstract available....
Water resources data
Water Resources Division, U.S. Geological Survey
1981, Report, U.S. Geological Survey water-data report
No abstract available....
Water resources data
Water Resources Division, U.S. Geological Survey
1981, Report, U.S. Geological Survey water-supply paper
No abstract available....
Alaska: Alaska National Interest Lands Conservation Act, December 2, 1980, P.L. 96-487: Kobuk Valley National Park, Alaska
1981, Report
...
Alaska: Alaska National Interest Lands Conservation Act, December 2, 1980, P.L. 96-487: Katmai National Park and Preserve, Alaska
1981, Report
...
Alaska: Alaska National Interest Lands Conservation Act, December 2, 1980, P.L. 96-487: Glacier Bay National Park and Preserve, Alaska
1981, Report
...
Alaska: Alaska National Interest Lands Conservation Act, December 2, 1980, P.L. 96-487: Kodiak National Wildlife Refuge, Alaska
1981, Report
...
The use of broadband thermal infrared images to monitor and to study dynamic geological phenomena
Richard S. Williams Jr.
1981, Technical Report 81-06
No abstract available....
Alaska: Alaska National Interest Lands Conservation Act, December 2, 1980, P.L. 96-487: Gates of Arctic National Park and Preserve, Alaska
1981, Report
...
Alaska: Alaska National Interest Lands Conservation Act, December 2, 1980, P.L. 96-487: White Mountains National Recreation Area, Alaska
1981, Report
...
Cache Creek: bear thrust environmental impact statement: proposed oil and gas drilling near Jackson, Teton County, Wyoming
Water Resources Division, U.S. Geological Survey
1981, Report
No abstract available....
Alaska: Alaska National Interest Lands Conservation Act, December 2, 1980, P.L. 96-487: Kenai Fjords National Park, Alaska
1981, Report
...
