Heavy-mineral variability in bottom sediments of the lower Chesapeake Bay, Virginia
F. Firek, G. L. Shideler, P. Fleischer
1977, Marine Geology (23) 217-235
Heavy minerals in bottom-sediment samples of the lower Chesapeake Bay show distribution patterns and interrelationships that denote characteristic mineral suites associated with defined geographic provinces. The Baymouth province has a garnet-hornblende-pyroxene suite, which is largely attributed to the influx of littoral and shelf sediments; the Eastern Shore province has a...
Interpretation of discordant 40Ar/39Ar age-spectra of mesozoic tholeiites from Antarctica
R.J. Fleck, J. F. Sutter, D.H. Elliot
1977, Geochimica et Cosmochimica Acta (41) 15-32
Conventional K-Ar ages of tholeiitic basalts of the Ferrar Group in the central Transantarctic Mountains indicate significant loss of radiogenic 40Ar from this unit over much of its outcrop area. Argon loss varies inversely with amount of devitrified matrix in the basalts, which have not been thermally or tectonically disturbed since...
Fluorite solubility equilibria in selected geothermal waters
D. Kirk Nordstrom, E. A. Jenne
1977, Geochimica et Cosmochimica Acta (41) 175-188
Calculation of chemical equilibria in 351 hot springs and surface waters from selected geothermal areas in the western United States indicate that the solubility of the mineral fluorite, CaF2, provides an equilibrium control on dissolved fluoride activity. Waters that are undersaturated...
Hydrothermal transport of heavy metals by seawater: The role of seawater/basalt ratio
W. Seyfried, J. L. Bischoff
1977, Earth and Planetary Science Letters (34) 71-77
Seawater reacted with basaltic glass at 260°C and 500 bars under water-dominated conditions (50 : 1 water/rock ratio) efficiently leached and maintained heavy metals in solution. Cu, Zn, and Ba are transferred in significant proportions to the aqueous phase, while Fe...
Terrestrial analogs of the Hellespontus dunes, Mars
C. S. Breed
1977, Icarus (30) 326-340
Geomorphic features in the Hellespontus region, Mars, were compared with dunes of the crescentic ridge type in numerous terrestrial sand seas quantitatively by dimensional analysis of dune lengths, widths, and wavelengths. Mean values for the Hellespontus dunes are close to mean values derived from measurements of all sampled terrestrial sand...
Suspended particle transport and circulation in San Francisco Bay - an overview
T. J. Conomos, D. H. Peterson
1977, Book chapter, Estuarine processes: circulation, sediments, and transfer of material in the estuary
Differences in the relative magnitude and timing of wind stress and river inflow in the northern and southern reaches of San Francisco Bay create different sedimentary conditions. The northern reach is a partially to well mixed estuary receiving most of the total annual fresh-water input (840 m3 sec−1) and suspended sediment...
Earthquake history of Texas
C. A. von Hake
1977, Earthquake Information Bulletin (USGS) (9) 30-32
Seventeen earthquakes, intensity V or greater, have centered in Texas since 1882, when the first shock was reported. The strongest earthquake, a maximum intensity VIII, was in western Texas in 1931 and was felt over 1 165 000 km 2. Three shocks in the Panhandle region in 1925, 1936, and 1943...
Earthquake history of South Dakota
C. A. von Hake
1977, Earthquake Information Bulletin (USGS) (9) 35-36
Twelve earthquakes of intensity V or greater (Modified Mercalli scale) have centered within the borders of South Dakota. All the shocks were rather localized, except that of 1911 which was felt over an area of approximately 100,000 km2. Some earthquakes from neighboring States were felt strongly in South Dakota. ...
Fluoride content of clay minerals and argillaceous earth materials
Josephus Thomas Jr., H.D. Glass, W.A. White, R.M. Trandel
1977, Clays and Clay Minerals (25) 278-284
A reliable method, utilizing a fluoride ion-selective electrode, is described for the determination of fluoride in clays and shales. Interference by aluminum and iron is minimal. The reproducibility of the method is about ±5% at different levels of fluoride concentration.Data are presented for various clay minerals and for the <2-µm...
Evolution of Seismic Geyser, Yellowstone National Park
George D. Marler, Donald E. White
1977, Earthquake Information Bulletin (USGS) (9) 21-25
The most significant event that has affected the geyser basins of Yellowstone National Park since its discovery was the Hebgen Lake earthquake, which occurred at 11:37 PM on August 17, 1959, with a Richter magnitude of 7.1. The epicenter of this earthquake was just west of the park, about 48...
Landslides
T. H. Nilsen
1977, Earthquake Information Bulletin (USGS) (9) 27-33
Landslides are frequent in areas where there is high seismicity and steep slopes. Landslides associated with earthquakes may cause as much damage as the initial ground shaking. They may also occur long after the earthquake. Some of the major earthquakes that have occurred during the past 15 years demonstrate the hazards...
Translations of early Polish language reports on bacterial hemorrhagic septicemia
S. F. Snieszko
1977, Progressive Fish-Culturist (39) 93
No abstract available....
Earthquakes and plate tectonics
H. Spall
1977, Earthquake Information Bulletin (USGS) (9) 14-17
The world's earthquakes are not randomly distributed over the Earth's surface. They tend to be concentrated in narrow zones. Why is this? And why are volcanoes and mountain ranges also found in these zones too? An explanation is to be found in plate tectonics, a concept which has revolutionized thinking in...
Earthquakes; January-February 1977
W. J. Person
1977, Earthquake Information Bulletin (USGS) (9) 46-47
There were no major earthquakes (7.0-7.9) during the first 2 months of the year, and no fatalities were reported. Three strong earthquakes occurred- New Guinea, Tadzhik S.S.R, and the Aleutian Islands. The Tadzhik earthquake on January 31 caused considerable damage and possible injuries. The United States experienced a number of...
Introductory remarks on NEIS from Lou Pakiser
H. Spall
1977, Earthquake Information Bulletin (USGS) (9) 4-6
Lou Pakiser is Chief of the Branch of Seismicity and Earth Structure of the U.S Geological Survey at Denver, Colo. He is responsible for managing the National Earthquake Information Service (NEIS), the Albuquerque Seismological Laboratory, other U.S Seismic observatories, and a reserach program related to global seismology....
Significant earthquakes of the world, 1976
W. J. Person
1977, Earthquake Information Bulletin (USGS) (9) 32-36
Evaluating the intensity of U.S. earthquakes
R. Simon, C. Stover
1977, Earthquake Information Bulletin (USGS) (9) 24-29
The intensity scale based on the Modified Mercalli Scale of 1931 (MM scale) measures the effects of seismic shaking. Intensity estimations are often the only representation of the size of an earthquake when small shocks occur in areas far removed from seismograph stations that can record them instrumentally. The impossibility...
Earthquake history of Tennessee
C. A. von Hake
1977, Earthquake Information Bulletin (USGS) (9) 37-39
The western part of the State was shaken strongly by the New Madrid, Mo., earthquakes of 1811-12 and by earthquakes in 1843 and 1895. The area has also experienced minor shocks. Additional activity has occurred in the eastern part of the State, near the North Carolina border. Forty shocks of...
When an earthquake occurs....
W. J. Person
1977, Earthquake Information Bulletin (USGS) (9) 17-19
When an earthquake occurs, we must be ready at the National Earthquake Information Service (NEIS) in Golden, Colo., to provide information as to its magnitude and epicenter as quickly as possible.This information is given to agencies concerned with disaster relief and to the press. A typical scenario for our operations...
Mitigating earthquakes; the federal role
F. Press
1977, Earthquake Information Bulletin (USGS) (9) 4-5
With rapid approach of a capability to make reliable earthquake forecasts, it essential that the Federal Government play a strong, positive role in formulating and implementing plans to reduce earthquake hazards. Many steps are being taken in this direction, with the President looking to the Office of Science and Technology...
Earthquakes: August-September 1976
W. J. Person
1977, Earthquake Information Bulletin (USGS) (9) 32-33
Destructive earthquakes continued to strike in many parts of the world during this period. The sparsely populated area of the New Hebrides Islands in the southwest Pacific was struck by a major earthquake (one with a magnitude between 7.0 and 7.9). A great earthquake (magnitude 8.0 or above) struck just...
Earthquake prediction: A perspective for a national program
P.L. Ward
1977, Earthquake Information Bulletin (USGS) (9) 10-13
Earthquake predictions is a rapidly advancing field of research and development. And now is the time to begin planning how we should use the results of this research. ...
Immunization of pacific salmon: comparison of intraperitoneal injection and hyperosmotic infiltration of Vibrio anguillarum and Aeromonas salmonicida bacterins
Ross Antipa, Donald F. Amend
1977, Journal of the Fisheries Research Board of Canada (34) 203-208
Two methods of immunizing fish, intraperitoneal (i.p.) injection and hyperosmotic infiltration, were compared for control of vibriosis and furunculosis in pen-reared coho salmon (Oncorhynchus kisutch) and chinook salmon (O. tshawytscha). Both methods provided significant protection against vibriosis under field test conditions. In coho salmon, hyperosmotic infiltration provided the best protection and...
Earthquake history of Virginia
C. A. von Hake
1977, Earthquake Information Bulletin (USGS) (9) 28-30
Virginia is a State of considerable seismic activity, although the earthquakes are rarely strong. Thirty-five shocks, intensity MM V or greater (Modified Mercalli Scale), are listed with epicenters within its borders. The locations of several of the older events are not precise; thus, the above count i subject to alteration....
Earthquakes in the United States
C. Stover
1977, Earthquake Information Bulletin (USGS) (9) 32-33
To supplement data in the report Preliminary Determination of Epicenters (PDE), the National earthquake Information Service (NEIS) also publishes a quarterly circular, Earthquakes in the United States. This provides information on the felt area of U.S earthquakes and their intensity. The main purpose is to describe the larger effects of these earthquakes so that...
