Formation and interpretation of dilatant echelon cracks
D. D. Pollard, P. Segall, P.T. Delaney
1982, Geological Society of America Bulletin (93) 1291-1303
The relative displacements of the walls of many veins, joints, and dikes demonstrate that these structures are dilatant cracks. We infer that dilatant cracks propagate in a principal stress plane, normal to the maximum tensile or least compressive stress. Arrays of echelon crack...
Refining Landsat classification results using digital terrain data
Wayne A. Miller, Mark Shasby
1982, Journal of Applied Photographic Engineering (8) 35-40
Scientists at the U.S. Geological Survey's Earth Resources Observation systems (EROS) Data Center have recently completed two land-cover mapping projects in which digital terrain data were used to refine Landsat classification results. Digital ter rain data were incorporated into the Landsat classification process using two different procedures that required developing...
The availability of conventional forms of remotely sensed data
James A. Sturdevant, Thomas M. Holm
1982, Journal of Applied Photographic Engineering (8) 153-158
For decades Federal and State agencies have been collecting aerial photographs of various film types and scales over parts of the United States. More recently, worldwide Earth resources data acquired by orbiting satellites have inundated the remote sensing community. Determining the types of remotely sensed data that are publicly available...
Digital model of predevelopment flow in the Tertiary limestone (Floridan) aquifer system in west-central Florida
Paul D. Ryder
1982, Water-Resources Investigations Report 81-54
A computer model was calibrated to approximate predevelopment flow conditions in a multilayered aquifer system in 10,600 square miles in west-central Floria. The lowermost aquifer, called the Floridan aquifer, is confined in most of the study area and consists of carbonate rocks ranging up to 1,300 feet thick. The Floridan...
Oahu: perspective from space
Gary E. Johnson
1982, Journal of Geography (81) 30-32
Satellite remote sensing provides us with a unique perspective from space. This perspective is synoptic in nature and provides regional views of most of the land areas of the earth. The orbital characteristics of the Landsat system are such that repetitive imagery of the same area may be obtained. Because...
An assessment of Landsat data acquisition history on identification and area estimation of corn and soybeans
M. M. Hixson, M. E. Bauer, Donna K. Scholz
1982, Remote Sensing of Environment (12) 123-128
In the past decade, numerous studies have demonstrated the potential of satellite remote sensing for providing accurate timely crop area information. This study assessed the impact of Landsat data acquisition history on classification and area estimation accuracy of corn and soybeans in the U.S. Corn Belt. The results illustrate the...
Deserts of China
Alta S. Walker
1982, American Scientist (70) 366-376
Improving arid land quality requires an understanding of the original state of the land and its relationship to wind, water, and plant regimes, as well as understanding of interactions within the present ecosystem. Chinese scientists and local residents have made significant advances in improving arid environments in gobi and sandy...
Digital image film generation: from the photoscientist's perspective
John E. Boyd
1982, Journal of Applied Photographic Engineering (8) 15-22
The technical sophistication of photoelectronic transducers, integrated circuits, and laser-beam film recorders has made digital imagery an alternative to traditional analog imagery for remote sensing. Because a digital image is stored in discrete digital values, image enhancement is possible before the data are converted to a photographic image. To create...
Changes in vegetation and grazing capacity following honey mesquite control
Kirk C. McDaniel, John H. Brock, Robert H. Haas
1982, Journal of Range Management (35) 551-557
Honey mesquite kill and suppression, vegetation response, and changes in grazing use and capacity were evaluated following brush control in north-central Texas. Tree grubbing was most effective for eliminating honey mesquite, but because of soil and plant damage the treatment did not increase grazing capacity or improve range condition compared...
Paleomagnetic data from the Coso Range, California and current status of the Cobb Mountain normal geomagnetic polarity event
Edward A. Mankinen, C. Sherman Gromme
1982, Geophysical Research Letters (9) 1279-1282
Two basalt flows which erupted about 1.08 m.y. ago in the Coso Range, California, have normal magnetic polarity and thus provide additional evidence for the Cobb Mountain normal polarity event. A review of available data confirms that this event was of geomagnetic origin. A mean age of 1.10 ± 0.02...
USGS aerial resolution targets.
P.H. Salamonowicz
1982, Photogrammetric Engineering and Remote Sensing (48) 1469-1473
It is necessary to measure the achievable resolution of any airborne sensor that is to be used for metric purposes. Laboratory calibration facilities may be inadequate or inappropriate for determining the resolution of non-photographic sensors such as optical-mechanical scanners, television imaging tubes, and linear arrays. However, large target arrays imaged...
Petrology and trace element geochemistry of the Honolulu volcanics, Oahu: Implications for the oceanic mantle below Hawaii
D.A. Clague, F.A. Frey
1982, Journal of Petrology (23) 447-504
The Honolulu Volcanics comprises small volume, late-stage (post-erosional) vents along rifts cutting the older massive Koolau tholeütic shield on Oahu, Hawaii. Most of these lavas and tuff of the Honolulu Volcanics have geochemical features expected of near-primary magmas derived from a peridotite source containing Fo87–89 olivine; e. g. 100 Mg/(Mg...
Hydrates of natural gas in continental margins
K.A. Kvenvolden, L.A. Barnard
1982, Book chapter, Studies in continental margin geology
Natural gas hydrates in continental margin sediment can be inferred from the widespread occurrence of an anomalous seismic reflector which coincides with the predicted transition boundary at the base of the gas hydrate zone. Direct evidence of gas hydrates is provided by visual observations of sediments from the landward wall...
Intraslope basins in Northwest Gulf of Mexico; a key to ancient submarine canyons and fans
A.H. Bouma
1982, Book chapter, M 34: Studies in Continental Margin Geology
The hummocky, diapirically deformed Texas-Louisiana continental slope includes three major types of intraslope basins: blocked-canyon intraslope basin, interdomal basin, and collapse basin. Major sand bodies present in the blocked-canyon intraslope basins are used to determine the sedimentary history of the Tertiary and Quaternary of this area. During relative lowering of...
Map showing cumulative thickness of sandstone in the Fox Hills-Lower Hell Creek aquifer, Montana
Richard D. Feltis
1982, Water-Resources Investigations Report 82-4043
No abstract available....
Cyclic deposits and hummocky cross-stratification of probable storm origins in Upper Cretaceous rocks of the Cape Sebastian area, southwestern Oregon
R. E. Hunter, H. Clifton
1982, Journal of Sedimentary Petrology (52) 127-143
Cyclic deposits containing hummocky cross-stratification occur in the upper part of the Cape Sebastian Sandstone of Bourgeois (1980), a shallow marine transgressive sandstone of Late Cetaceous age on the southern Oregon coast. The cycles average 1.6 m in thickness and consist, where complete,...
The impact of entrainment and impingement on fish populations in the Hudson River estuary : Volume III : An analysis of the validity of the utilities' stock recruitment curve-fitting exercise and "prior estimation of beta" technique
S.W. Christensen, C.P. Goodyear, B.L. Kirk
1982, Report
No abstract available at this time...
Detection of diethylnitrosamine in nitrate-rich water following treatment with Rhodamine flow tracers
S. L. Abidi
1982, Water Research (16) 199-204
Extremely carcinogenic diethylnitrosamine (DENA) was found to form in up to 75% yield from the reaction of nitrite with the two commonly used water tracing dyes. Rhodamine B and Rhodamine WT, DENA was detected at trace levels (0.13–7.02 μg −1) in river water samples after treatment with the dye and nitrite....
Subcellular distribution of mercury in liver of lake trout (Salvelinus namaycush)
D.R. May Passino, J. Matsumoto Kramer
1982, Experientia (38) 689-690
Mercury was found primarily (80%) in the submicroscopic material (magnification x < 7700) of environmentally exposed adult lake trout from Lake Michigan, USA....
A note on the Goodman Jack
H.S. Swolfs, J.D. Kibler
1982, Rock Mechanics Felsmechanik Mecanique des Roches (15) 57-66
A Note on the Goodman Jack. Reconnaissance experiments, performed to evaluate the practical utility of the hard-rock variety of the Goodman Jack 1, reveal that the Hustrulid-T* correction adequately reconciles the discrepancy between the measured and true deformation modulus of the rock mass in the range of 30 to50 gigapascals....
Seismology in Mexico
C. Lomnitz
1982, Earthquake Information Bulletin (USGS) (14) 30-32
Mexico is situated at the intersection of four major crustal Plates: the Americas Plate, the Pacific Plate, the Caribbean Plate, and the Cocos Plate. The interaction of these four plates is very complex. The pattern of earthquake risk is, therefore, among the most complicated in the world. The average release...
Measurements of storm-generated bottom stresses on the continental shelf
D.A. Cacchione, D.E. Drake
1982, Journal of Geophysical Research - Oceans (87) 1952-1960
Large values of bottom friction velocity, u*, and roughness length, z0, determined from burst-averaged speed data taken on the continental shelf in outer Norton Sound, Alaska, with the GEOPROBE tripod during a storm in September 1977 are correlated with extremely large values of near-bottom concentration of total suspended particulate matter (TSM). Combined...
Fission-track ages from the Precambrian of Shropshire
C. W. Naeser, P. Toghill, R. J. Ross Jr.
1982, Geological Magazine (119) 213-214
Four samples of Longmyndian and Uriconian strata from S of Shrewsbury, England have been processed for apatite and/or zircon fission-track ages. The resultant ages illustrate how depth of burial may affect fission-track ages. The analytical procedures followed were as described in Naeser (1979).-from Authors...
Earthquake engineering research program in Chile
G. R. Saragoni
1982, Earthquake Information Bulletin (USGS) (14) 22-25
Earthquake engineering research in Chile has been carried out for more than 30 years. Systematic research is done at the university of Chile in Santiago. Other universities such as the Catholic University, university of Concepcion, and the Federico Santa Maria Technical University have begun to teach and conduct research in...
Jack London and the San Francisco earthquake
J.S. Sachs
1982, Earthquake Information Bulletin (USGS) (14) 94-97
After it was over, it seemed to many, and especially to eyewitnesses like Jack London, that the earthquake and fire had devastated San Francisco. However people were confident that, like the phoeniz, San Francisco would rise from the ashes and regain her palce as the "Imperial City of the West." ...
