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Page 4655, results 116351 - 116375

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Not all publications have extents, not all extents are completely accurate
Floods of April 18, 1983 on St. Thomas and St. John, U.S. Virgin Islands
R. E. Curtis Jr.
1984, Water-Resources Investigations Report 84-4184
The U.S. Virgin Islands of St. Thomas and St. John experienced the most intense rainfall event in recorded history on April 18, 1983. Rainfall intensities of 2.5 inches per hour, and more than 16 inches in 18 hours were recorded. Almost instantaneous runoff caused widespread flooding near the coastlines of...
Modification of wave-cut and faulting-controlled landforms
Thomas C. Hanks, R.C. Bucknam, K. R. Lajoie, R. E. Wallace
1984, Journal of Geophysical Research Solid Earth (89) 5771-5790
From a casual observation that the form of degraded fault scarps resembles the error function, this investigation proceeds through an elementary diffusion equation representation of landform evolution to the application of the resulting equations to the modern topography of scarplike landforms. The morphologic observations can be analyzed either in the...
Geomagnetic paleointensities from excursion sequences in lavas on Oahu, Hawaii
Robert S. Coe, Sherman Gromme, Edward A. Mankinen
1984, Journal of Geophysical Research B: Solid Earth (89) 1059-1069
Paleomagnetic data demonstrating three late Tertiary excursions in the direction of the geomagnetic field recorded in sequences of basaltic lavas on the island of Oahu, Hawaii were published by R. R. Doell and G. B. Dalrymple in 1973. We have determined geomagnetic paleointensities by the Thelliers' method for 14 lavas...
Paleomagnetic constraints on the interpretation of early Cenozoic Pacific Northwest paleogeography
Ray E. Wells
1984, Pacific Section S.E.P.M. (42) 231-237
Widespread Cenozoic clockwise tectonic rotation in the Pacific Northwest is an established fact; however, the geologic reconstructions based on these rotations are the subject of continuing debate. Three basic mechanisms have been proposed to explain the rotations: (1) simple shear rotation of marginal terranes caught in the dextral shear couple...
Book review: Geomagnetism of baked clays and recent sediments
Edward A. Mankinen
1984, Eos, Transactions, American Geophysical Union (65) 787-787
This book is an outgrowth of the symposium entitled “Time Scales of Geomagnetic Secular Variations,” which was held at the 4th Assembly of the International Association of Geomagnetism and Aeronomy (Edinburgh, U.K., August 1981). The volume includes many of the papers presented, which described paleomagnetic results from both archeologic materials...
DIGITAL PROCESSING TECHNIQUES FOR IMAGE MAPPING WITH LANDSAT TM AND SPOT SIMULATOR DATA.
Pat S. Chavez Jr.
Cook Jerald J., editor(s)
1984, Conference Paper, Proceedings of the International Symposium on Remote Sensing of Environment
To overcome certain problems associated with the visual selection of Landsat TM bands for image mapping, the author used a quantitative technique that ranks the 20 possible three-band combinations based upon their information content. Standard deviations and correlation coefficients can be used to compute a value called the Optimum Index...
Implications of paleomagnetism for the tectonic history of the Eastern Klamath and related terranes in California and Oregon
Edward A. Mankinen, William P. Irwin, C. Sherman Gromme
T. H. Nilsen, editor(s)
1984, Pacific Section S.E.P.M. (42) 221-229
Paleomagnetic study of Permian to Jurassic volcanic and sedimentary strata of the Eastern Klamath terrane has shown the remanent magnetism of these rocks to be prefolding and primary. The Permian and Triassic rocks are both indicated to have rotated 100° clockwise, while the Jurassic strata have rotated 60° clockwise. The...
SOME APPLICATIONS OF SEISMIC SOURCE MECHANISM STUDIES TO ASSESSING UNDERGROUND HAZARD.
Art McGarr
Gay N.C.Wainwright E.H., editor(s)
1984, Conference Paper
Various measures of the seismic source mechanism of mine tremors, such as magnitude, moment, stress drop, apparent stress, and seismic efficiency, can be related directly to several aspects of the problem of determining the underground hazard arising from strong ground motion of large seismic events. First, the relation between the...
The relationship of Landsat digital data to the properties of Arizona rangelands
Emil H. Horvath, D. F. Post, J. B. Kelsey
1984, Soil Science Society of America Journal (48) 1331-1334
Pedon descriptions, vegetation transect information, and Landsat digital data were obtained for 110 sites on the Tonto National Forest in central Arizona. Using the field and satellite data, 33 variables were evaluated and prediction models were generated using stepwise multiple regression techniques. The following six factors explained 84% of the...
Denitrification in San Francisco Bay intertidal sediments
Ronald S. Oremland, Cindy Umberger, Charles W. Culbertson, Richard L. Smith
1984, Applied and Environmental Microbiology (47) 1106-1112
The acetylene block technique was employed to study denitrification in intertidal estuarine sediments. Addition of nitrate to sediment slurries stimulated denitrification. During the dry season, sediment-slurry denitrification rates displayed Michaelis-Menten kinetics, and ambient NO3− + NO2− concentrations (≤26 μM) were below the apparent Km (50 μM) for nitrate. During the rainy season, when ambient...