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...
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...
Laboratory hydraulic fracturing experiments in intact and pre-fractured rock
Mark D. Zoback, F. Rummel, R. Jung, C.B. Raleigh
1977, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts (14) 49-58
Laboratory hydraulic fracturing experiments were conducted to investigate two factors which could influence the use of the hydrofrac technique for in-situ stress determinations; the possible dependence of the breakdown pressure upon the rate of borehole pressurization, and the influence of pre-existing cracks on the orientation of generated fractures. The experiments...
Upland nesting of American bitterns, marsh hawks, and short-eared owls
Harold F. Duebbert, J. T. Lokemoen
1977, Prairie Naturalist (9) 33-40
No abstract available....
Ground-water discharge from the Edwards and associated limestones, San Antonio area, Texas, 1976
R. A. Rappmund
1977, Edwards Underground Water District Bulletin 36
No abstract available....
Drainage areas of Texas streams, Brazos River Basin
F.H. Tovar, S.M. Brown
1977, Report
No abstract available....
Orientale and Caloris
J.F. McCauley
1977, Physics of the Earth and Planetary Interiors (15) 220-250
Applications of experimental explosion-crater data to Orientale and recent geologic mapping of the basin have produced a new stratigraphy and genetic model for Orientale that are also applicable to Caloris. The inner-basin scarp of Orientale is thought to be a bench separating the upper parts of the basin from its...
Paleomagnetic poles and polarity zonation from Cambrian and Devonian strata of Arizona
D. P. Elston, S.L. Bressler
1977, Earth and Planetary Science Letters (36) 423-433
Basal Paleozoic Tapeats Sandstone (Early and Middle Cambrian) in northern and central Arizona exhibits mixed polarity and a low-latitude paleomagnetic pole. Carbonates of Middle and early Late Cambrian age, and directly superposed carbonate and carbonate-cemented strata of latest Middle(?) and early...
Worldwide standardized seismograph network
J. Peterson
1977, Earthquake Information Bulletin (USGS) (9) 36-45
A global network of seismographs is as indispensable to seismologists as telescopes are to astronomers. The network is used to catalog the thousands of earthquakes that occur each year and to provide the data needed for detailed studies of earthquake mechanisms, deep Earth structure, and tectonic processes. Like astronomy, seismology...
Earthquake research in China
B. Raleigh
1977, Earthquake Information Bulletin (USGS) (9) 18-21
On the evening of February 4, 1975, a magnitude 7.3 earthquake occurred near Haicheng in Liaoning Privince in eastern China. Almost 90 percent of the structures in Haicheng, a city of 90,000 people, were destroyed or seriously damaged. Given the time of day, the subfreezing temperatures, and the population density...
The Guatemala earthquake and Caribbean Plate tectonics
George Plafker
1977, Earthquake Information Bulletin (USGS) (9) 18-20
The main fault along which the destructive Guatemala earthquake occurred was the Motagua fault. Ground breakage was observed in a continuous, well-defined line for 230 km. At its closest point, the fault is 25 km north of Guatemala City. Surface displacement across the fault was dominantly horizontal and sinistral (see...
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...
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....
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...
Earthquake lights
J.S. Derr
1977, Earthquake Information Bulletin (USGS) (9) 18-21
Construction and operation of cable-chain drag for nest searches
K.F. Higgins, L.M. Kirsch, Harold F. Duebbert, A. Klett
1977, Wildlife Leaflet 512
A list of materials necessary to build and use a 53-m-long cable-chain drag is presented. Techniques are described for searching, finding, and marking nests in a typical area of grassland.During nine nesting seasons, 7,894 nests representing 32 species were found by searching fields with cable-chain drags. Only 2% of the...
Geochemical and hydrologic data for wells and springs in thermal-spring areas of the Appalachians
W.A. Hobba Jr., J.C. Chemerys, D.W. Fisher, F. J. Pearson Jr.
1977, Water-Resources Investigations Report 77-25
Current interest in geothermal potential of thermal-spring areas in the Appalachians enhances the value of data on thermal springs and wells in these areas. This report presents maps showing locations of selected springs and wells and tables of physical and chemical data pertaining to these wells and springs. The chemical...
Ultraviolet treatment of water for destruction of five gram-negative bacteria pathogenic to fishes
G. L. Bullock, H. M. Stuckey
1977, Journal of the Fisheries Research Board of Canada (34) 1244-1249
Mineral resources of the Tracy Arm-Fords Terror Wilderness Study Area and vicinity, Alaska
David A. Brew, Donald Grybeck, Bruce R. Johnson, Robert C. Jachens, C.J. Nutt, D.F. Barnes, A.L. Kimball, J.C. Still, J.L. Rataj
1977, Open-File Report 77-649
The Wilderness Study Area consists of about 322,300 hectares (1,250 square miles or 796,400 acres) on the southwest side of the Coast Range in southeastern Alaska about 72 km (45 miles) southeast of Juneau, Alaska (fig. 1). An additional 142,800 hectares (550 square miles or 352,900 acres) lying in part...
Square wave voltammetry at the dropping mercury electrode: Theory
J. H. Christie, J.A. Turner, R. A. Osteryoung
1977, Analytical Chemistry (49) 1899-1903
The theoretical aspects of square wave voltammetry at the dropping mercury electrode are presented. The technique involves scanning the entire potential range of interest on a single drop of a DME. Asymmetries in the waveform as well as variations in current measurement parameters are discussed. Indications are that previous uses...
Differences in swimming performance among strains of rainbow trout (Salmo gairdneri)
A.E. Thomas, M.J. Donahoo
1977, Journal of the Fisheries Research Board of Canada (34) 304-307
Swimming performance profiles, relating fish size to swimming time, were established for three strains of rainbow trout (Salmo gairdneri). No differences were found in slope of regressions; only in level at each size of fish. Swimming performances of New Zealand and Sand Creek strains did not differ, but were superior...
Hydrochemistry of the Lake Magadi basin, Kenya
B.F. Jones, H.P. Eugster, S.L. Rettig
1977, Geochimica et Cosmochimica Acta (41) 53-72
New and more complete compositional data are presented for a large number of water samples from the Lake Magadi area, Kenya. These water samples range from dilute inflow (<0.1 g/kg dissolved solids) to very concentrated brines (>300 g/kg dissolved solids). Five distinct hydrologic stages can be recognized in the evolution...
Unusual foraging by a fork-tailed storm-petrel
Robert E. Gill Jr.
1977, The Auk (94) 385-386
While conducting an offshore bird census from the sea beach at Nelson Lagoon, Alaska Peninsula (56°00'N, 161°10'W) at 1700 on 17 September 1976 1 saw a Fork-tailed Storm Petrel (Oceanodroma f. furcata) feeding on the beached remains of an adult gray whale (Eschrichtius robustus) that had been trapped by ice...
Recent and relict topography of Boo Bee patch reef, Belize
R. B. Halley, E.A. Shinn, J.H. Hudson, B. Lidz
D.L. Taylor, editor(s)
1977, Conference Paper, Proceedings: Third International Coral Reef Symposium
Five core borings were taken on and around Boo Bee Patch Reef to better understand the origin of such shelf lagoon reefs. The cores reveal 4 stages of development: (1) subaerial exposure of a Pleistocene "high" having about 8 meters of relief, possibly a Pleistocene patch reef; (2) deposition of...
Breeding avifauna of the south San Francisco Bay estuary
Robert E. Gill Jr.
1977, Western Birds (8) 1-12
San Francisco Bay represents one of the largest estuarine areas on the Pacific Coast of North America. Its open waters, tidal flats, tidal marshes and solar evaporation ponds provide critical foraging, resting and breeding habitat for migratory and resident birds. The avifauna of San Francisco Bay has received considerable attention;...
