Comet showers as a cause of mass extinctions
Piet Hut, Walter Alvarez, William P. Elder, Thor Hansen, Erle G. Kauffman, Gerta Keller, Eugene Merle Shoemaker, Paul R. Weissman
1987, Nature (329) 118-126
If at least some mass extinctions are caused by impacts, why do they extend over intervals of one to three million years and have a partly stepwise character? The solution may be provided by multiple cometary impacts. Astronomical, geological and palaeontological evidence is consistent with a...
An aeromagnetic study of Mount St. Helens
Carol A. Finn, David L. Williams
1987, Journal of Geophysical Research B: Solid Earth (92) 10194-10206
Aeromagnetic data from surveys flown by the U.S. Geological Survey over Mount St. Helens, Washington, before and after the climactic May 18, 1980, eruption were used to determine the bulk magnetic properties of the volcano and to delineate a buried source. We assumed that most of the edifice of preeruption...
Seismomagnetic observation during the 8 July 1986 magnitude 5.9 North Palm Springs earthquake
M.J.S. Johnston, R.J. Mueller
1987, Science (237) 1201-1203
A differentially connected array of 24 proton magnetometers has operated along the San Andreas fault since 1976. Seismomagnetic offsets of 1.2 and 0.3 nanotesla were observed at epicentral distances of 3 and 9 kilometers, respectively, after the 8 July 1986 magnitude 5.9 North Palm Springs earthquake. These seismomagnetic observations are...
Below-ground herbivory in natural communities: a review emphasizing fossorial animals
Douglas C. Andersen
1987, The Quarterly Review of Biology (62) 261-286
Roots, bulbs, corms, and other below-ground organs are almost universally present in communities containing vascular plants. A large and taxonomically diverse group of herbivores uses these below-ground plant parts as its sole or primary source of food. Important within this group are plant-parasitic nematodes and several fossorial taxa that affect...
Processing and analysis of commercial satellite image data of the nuclear accident at Chernobyl, U.S.S.R.
Franklin G. Sadowski, Steven J. Covington, Joy J. Hood, David Meyer, John L. Dwyer, Wayne A. Miller
1987, Conference Paper, 1987 ASPRS-ACSM Fall Convention: ASPRS technical papers
No abstract available....
Delindeite titanosilicates and lourenswalsite, two new from the Magnet Cove region, Arkansas
Daniel E. Appleman, Howard T. Evans Jr., Gordon L. Nord Jr., Edward J. Dwornik, Charles Milton
1987, Mineralogical Magazine (51) 417-425
Delindeite and lourenswalsite are two new barium titanosilicate minerals found as microscopic crystals in miarolitic cavities in nepheline syenite in the Diamond Jo quarry, Hot Spring County, Arkansas. Delindeite is found as aggregates of flake-like crystallites in compact spherules, light pinkish grey in colour, with a resinous, pearly lustre. The...
Evolution of the Early Proterozoic Colorado province: Constraints from U-Pb geochronology
John C. Reed Jr., M. E. Bickford, Wayne R. Premo, John N. Aleinikoff, John S. Pallister
1987, Geology (15) 861-865
The Colorado province represents an addition of a belt of rocks more than 500 km wide to the southern margin of the Archean Wyoming craton during the Early Proterozoic, between about 1790 and 1660 Ma. Correspondence in ages between metamorphism, deformation, and plutonism; association of volcanic rocks with comagmatic calc-alkalic...
Selenium adsorption by goethite
Laurie S. Balistrieri, T. T. Chao
1987, Soil Science Society of America Journal (51) 1145-1151
The adsorption of Se by goethite was studied as a function of time (10 min–24 h), temperature (295.5 and 303.5 K), pH (4–11), particle concentration (3–300 mg/L), total Se concentration (0.02–5 × 10−5 M), oxidation state [Se(IV) and Se(VI)], and competing anion concentration [(anion)/(Se(IV) = 0.25 to 50 000] in order...
Avian habitat relationships in pinyon-juniper woodland
James A. Sedgwick
1987, The Wilson Bulletin (99) 413-431
Habitat relationships of breeding birds were examined in northwestern Colorado in pinyon-juniper (Pinus edulis-Juniperus osteosperma) woodland and in openings where most overstory trees had been knocked down by anchor chaining. Vegetation characteristics and physical habitat features were measured in 233 0.04-ha circular plots around singing males of 13 species of...
Analysis of the U.S. Geological Survey streamgaging network
A. G. Scott
1987, Water Science and Technology (19) 31-42
This paper summarizes the results from the first 3 years of a 5-year cost-effectiveness study of the U.S. Geological Survey streamgaging network. The objective of the study is to define and document the most cost-effective means of furnishing streamflow information. In the first step of this study,...
Instream flow values and power production
Robert T. Milhous, Aaron J. Douglas
1987, Book, Waterpower '87 : proceedings of the International Conference on Hydropower
No abstract available....
Results of a workshop concerning ecological zonation in bottomland hardwoods
James E. Roelle, Gregor T. Auble, David B. Hamilton, Richard L. Johnson, Charles A. Segelquist
1987, Report
Under Section 404 of the Clean Water Act, the U.S. Environmental Protection Agency (EPA) has regulatory responsibilities concerning the discharge of dredged or fill material into the Nation's waters. In addition to its advisory role in the U.S. Army Corps of Engineers' permit program, EPA has a number of specific...
Status of worldwide Landsat archive
Howard W. Warriner
1987, Conference Paper, Pecora XI Symposium
In cooperation with the International Landsat community, and through the Landsat Technical Working Group (LTWG), NOAA is assembling information about the status of the Worldwide Landsat Archive. During LTWG 9, member nations agreed to participate in a survey of International Landsat data holding and of their archive experiences with...
Image restoration techniques as applied to Landsat MSS and TM data
David Meyer
1987, Pecora XI Symposium 427-427
Two factors are primarily responsible for the loss of image sharpness in processing digital Landsat images. The first factor is inherent in the data because the sensor's optics and electronics, along with other sensor elements, blur and smear the data. Digital image restoration can be used to reduce...
Results of a workshop concerning impacts of various activities on the functions of bottomland hardwoods
James E. Roelle, Gregor T. Auble, David B. Hamilton, Gerald C. Horak, Richard L. Johnson, Charles A. Segelquist
1987, Report
Under Section 404 of the Clean Water Act, the U.S. Environmental Protection Agency (EPA) has regulatory responsibilities related to the discharge of dredged or fill material into the Nation’s waters. In addition to its advisory role in the U.S. Army Corps of Engineers' permit program, EPA has a number of...
A conceptual method for monitoring locust habitat
Stephen M. Howard, Thomas R. Loveland, Donald O. Ohlen, Donald G. Moore, Kevin P. Gallo, Jonathon Olsson
1987, Pecora XI Symposium 376-377
A procedure to map and monitor vegetation conditions in near-real time was developed at the United States Geological Survey;s Earth Resources Observation Systems Data Center for use in locust control efforts. Meteorological satellite dat were acquired daily for 3 weeks in October and November 1986 over a 1.4-million-square-kilometer study...
Results of a workshop concerning assessment of the functions of bottomland hardwoods
James E. Roelle, Gregor T. Auble, David B. Hamilton, Richard L. Johnson, Charles A. Segelquist
1987, Report
The U.S. Environmental Protection Agency (EPA) is authorized under Section 404 of the Clean Water Act (33 U.S.C. 1344) to participate in the regulation of the discharge of dredged or fill material into waters of the United States. This regulatory authority is exercised in partnership with the U.S. Army Corps...
A joint NOAA/USGS study to evaluate satellite assessment of land surface features and climatic variables
Kevin P. Gallo, J.D. Tarpley, Stephen M. Howard, D. G. Moore
1987, Conference Paper, Pecora XI Symposium
Data collection and preliminary analyses have begun for a study that will evaluate the usefulness of satellite data for assessment of land surface features and climatic variables. The objective of the study is to determine what relationships exist between routinely available ground-based climatic and land surface information and satellite-obtained...
Age-specificity of black-capped chickadee survival rates: Analysis of capture-recapture data
G. Loery, James D. Nichols, Kenneth H. Pollock, James E. Hines
1987, Ecology (68) 1038-1044
The ornithological literature indicates a widespread belief in two generalizations about the age—specificity of avian survival rates: (1) survival rates of young birds for some period following fledging are lower than those of adults, and (2) after reaching adulthood survival rates are constant for birds of all ages. There is...
Producing Alaska interim land cover maps from Landsat digital and ancillary data
Katherine Fitzpatrick-Lins, Eileen Flanagan Doughty, Mark Shasby, Thomas R. Loveland, Susan Benjamin
1987, Conference Paper, Pecora XI Symposium
In 1985, the U.S. Geological Survey initiated a research program to produce 1:250,000-scale land cover maps of Alaska using digital Landsat multispectral scanner data and ancillary data and to evaluate the potential of establishing a statewide land cover mapping program using this approach. The geometrically corrected and resampled Landsat...
Data integration using color space transforms
Jay W. Feuquay
1987, Pecora XI Symposium 326-326
The demand for increased spatial resolution without sacrificing spectral discrimination can be fulfilled by integration of data from different sensor systems and satellite programs. Data of high spatial resolution are frequently available in panchromatic (black-and-white) form rather than multispectral. Techniques gave been developed to combine the higher resolution...
Digital processing techniques and film density calibration for printing image data
Pat S. Chavez, Joseph A. McSweeney, Douglas R. Binnie
1987, Conference Paper, Pecora XI Symposium
Satellite image data that cover a wide range of environments are being used to make prints that represent a map type product. If a wide distribution of these products is desired, they are printed using lithographic rather than photographic procedures to reduce the cost per print. Problems are...
BIA interpretation techniques for vegetation mapping using thematic mapper false color composites (interim report for San Carlos Reservation)
W.J. Bonner, T.C. English, R. H. Haas, T.R. Feagan, R.A. McKinley
1987, Pecora XI Symposium 291-292
The Bureau of Indian Affairs (BIA) is responsible for the natural resource management of approximately 52 million acres of Trust lands in the contiguous United States. The lands are distributed in a "patchwork" fashion throughout the country. Management responsibilities on these areas include: minerals, range, timber, fish and...
A color-communication scheme for digital imagery
Alex Acosta
1987, Pecora XI Symposium 253-272
Color pictures generated from digital images are frequently used by geologists, foresters, range managers, and others. These color products are preferred over black and white pictures because the human eye is more sensitive to color differences than to various shades of gray. Color discrimination is a function of...
Overview of the land analysis system (LAS)
Bruce K. Quirk, Lyndon R. Olseson
1987, Conference Paper, Pecora XI Symposium
The Land Analysis System (LAS) is a fully integrated digital analysis system designed to support remote sensing, image processing, and geographic information systems research. LAS is being developed through a cooperative effort between the National Aeronautics and Space Administration Goddard Space Flight Center and the U. S. Geological Survey...
