Degassing of Lake Nyos
George Kling, William C. Evans, Michele L. Tuttle, Gregory Tanyileke
1994, Nature (368) 405-406
No abstract available....
Thermal history of the periphery of the Junggar Basin, Northwestern China
J. David King, J. Yang, F. Pu
1994, Organic Geochemistry (21) 393-405
Geochemical analysis of rock core samples show that the basin periphery has experienced low thermal stress; present-day heat flows are in the range of 25–35 mW/m2 and have not been significantly higher than the worldwide mean of approx. 63 mW/m2 since the mid-Permian. Present day heat flows were determined from corrected borehole...
Deep scientific drilling in the San Andreas Fault Zone
Stephen H. Hickman, Mark D. Zoback, Leland Younker, William L. Ellsworth
1994, Eos Science News (75) 137-141
A deep scientific drilling experiment in San Andreas fault zone would provide data essential to understanding the structure, composition, mechanical behavior, and physical state of an active, major plate-boundary fault. Toward this end, we are working with an international team of scientists and engineers to propose a long-term, integrated program...
Aftershocks of the 13 May 1993 Shumagin Alaska earthquake
Zhong Lu, Max Wyss, Guy Tytgat, Steve McNutt, Scott Stihler
1994, Geophysical Research Letters (21) 497-500
The 13 May 1993 Ms 6.9 Shumagin earthquake had an aftershock sequence of 247 earthquakes with magnitudes greater than or equal to 1.5 by 1 June 1993. Of these aftershocks, 79 were located by using S-P travel times at the only two stations within 570 km of the mainshock epicenter....
Strain accumulation in the Shumagin Islands: Results of initial GPS measurements
Kristine M. Larson, Michael Lisowski
1994, Geophysical Research Letters (21) 489-492
Deformation in the Shumagin seismic gap has been monitored with repeated trilateration (EDM) in the 1980–1987 interval and with the Global Positioning System (GPS) in the 1987–1991 interval. The geodetic network extends for 100-km across the Shumagin Islands to the Alaska Peninsula. Results from the GPS surveys are consistent with...
A new species of Hymenocallis (Amaryllidaceae) in the Florida Panhandle
Gerald L. Smith, Melanie R. Darst
1994, Novon (4) 396-399
A new species of spider-lily, Hymenocallis godfreyi, is described and illustrated. It is a rare endemic that occurs in the St. Marks and Wakulla Rivers, Florida. Its striking features are contrasted to an allied species Hymenocallis rotata (Ker-Gawler) Herbert....
Disturbance regime and disturbance interactions in Rocky Mountain subalpine forest
Thomas T. Veblen, Keith S. Hadley, Elizabeth M. Nel, Thomas Kitzberger, Marion Reid, Ricardo Villalba
1994, Journal of Ecology (82) 125-135
1 The spatial and temporal patterns of fire, snow avalanches and spruce beetle out-breaks were investigated in Marvine Lakes Valley in the Colorado Rocky Mountains in forests of Picea engelmannii, Abies lasiocarpa, Pseudotsuga menziesiiand Populus tremuloides. Dates and locations of disturbances were determined by dendrochronological techniques. A geographic information system...
Migrating shorebirds and habitat dynamics at a prairie wetland complex
Susan K. Skagen, Fritz L. Knopf
1994, The Wilson Bulletin (106) 91-105
We examined the responses of migrating shorebirds to habitat dynamics in a wetland complex on the Great Plains during 1989-1992. Availability of habitat was variable within and between seasons, but fluctuations in habitat were dampened when wetlands were considered as a complex rather than individually. Shorebirds exhibited an...
Are cicadas (Diceroprocta apache) both a "keystone" and a "critical-link" species in lower Colorado River riparian communities?
Douglas C. Andersen
1994, Southwestern Naturalist (39) 26-33
Apache cicada (Homoptera: Cicadidae: Diceroprocta apache Davis) densities were estimated to be 10 individuals/m2 within a closed-canopy stand of Fremont cottonwood (Populus fremontii) and Goodding willow (Salix gooddingii) in a revegetated site adjacent to the Colorado River near Parker, Arizona. Coupled with data drawn from the literature, I estimate that...
Physical geology and eruptive history of the Matahina Ignimbrite, Taupo Volcanic Zone, North Island, New Zealand
Roy A. Bailey, R. Garry Carr
1994, New Zealand Journal of Geology and Geophysics (37) 319-344
The Matahina Ignimbrite is a 280 ka ash‐flow sheet that erupted from Haroharo Caldera in the Okataina Volcanic Centre, northern Taupo Volcanic Zone, North Island, New Zealand. The ignimbrite underlies a 2000 km2 area mainly east of the caldera, ranges in thickness from 5 to 200 m, and has a outflow...
Introduction
Michael L. Blanpied, Chris Marone
1994, Pure and Applied Geophysics (143) 1-5
No abstract available....
Disharmonic drape folds in the highly attenuated Colo rado River extensional corridor, California and Arizona
B.E. John, K. A. Howard
1994, Book chapter, Geological investigations of an active margin
No abstract available...
The enigma of oil and gas field growth
Emil D. Attanasi, David H. Root
1994, American Association of Petroleum Geologists Bulletin (78) 321-332
Growth in estimates of recovery in discovered fields is an important source of annual additions to United States proved reserves. This paper examines historical field growth and presents estimates of future additions to proved reserves from fields discovered before 1992. Field-level data permitted the sample to be partitioned on the...
Modeling of soil water retention from saturation to oven dryness
Cinzia Rossi, John R. Nimmo
1994, Water Resources Research (30) 701-708
Most analytical formulas used to model moisture retention in unsaturated porous media have been developed for the wet range and are unsuitable for applications in which low water contents are important. We have developed two models that fit the entire range from saturation to oven dryness in a practical and...
Comparison of drilling reports and detailed geophysical analysis of ground-water production in bedrock wells
Frederick Paillet, Russell Duncanson
1994, Groundwater (32) 200-206
The most extensive data base for fractured bedrock aquifers consists of drilling reports maintained by various state agencies. We investigated the accuracy and reliability of such reports by comparing a representative set of reports for nine wells drilled by conventional air percussion methods in granite with a suite of geophysical...
Thermal history of the periphery of the Junggar Basin, Northwestern China
J. David King, Jianqiang Yang, Fan Pu
1994, Organic Geochemistry (21) 393-405
Geochemical analysis of rock core samples show that the basin periphery has experienced low thermal stress; present-day heat flows are in the range of 25–35 mW/m2 and have not been significantly higher than the worldwide mean of approx. 63 mW/m2 since the mid-Permian. Present day heat flows were determined from...
Late Pliocene paleoecologic reconstructions based on ostracode assemblages from the Sagavanirktok and Gubik formations, Alaskan North Slope
Elisabeth M. Brouwers
1994, Arctic (47) 16-33
Shallow-marine ostracode assemblages from upper Pliocene sediments of the upper part of the Sagavanirktok Formation and lower part of the Gubik Formation record the last warm period that occurred before the onset of significant cooling of the Arctic Ocean and the initiation of Northern Hemisphere continental glaciation. The informally named...
Deformities in birds of the Great Lakes region. Assigning causality
John P. Giesy, James P. Ludwig, Donald E. Tillitt
1994, Environmental Science & Technology (28) 128A-135A
No abstract available....
Conflicting tectonics? Contraction and extension at middle and upper crustal levels along the Cordilleran Late Jurassic arc, southeastern California
Mark J. Davis, Daniel L. Farber, Joe L. Wooden, J. Lawford Anderson
1994, Geology (22) 247-250
Effects of mid-Mesozoic contraction followed closely in time by extension are present in mid- to upper-crustal plutonic rocks in the Chuckwalla Mountains of the eastern Transverse Ranges, California. Late Jurassic movement along a steeply dipping, right-lateral mylonitic shear zone is bracketed between 159 and 147 Ma via U-Pb dated plutons....
National wetlands research center uses visual true color classification in waterfowl habitat mapping
Elijah Ramsey III, Steve Hartley
1994, Earth Observation Magazine 28-30
No abstract available....
Movements of water, solutes, and stable isotopes in the unsaturated zones of two sand plains in the upper Midwest
Stephen C. Komor, Douglas G. Emerson
1994, Water Resources Research (30) 253-267
Four month-long field experiments investigated movements of water and solutes through unsaturated sand plains near Princeton, Minnesota, and Oakes, North Dakota. Atrazine and bromide were applied to bare soils and soils planted with corn. The field plots were irrigated according to local farming practices. At the end of each experiment,...
Topography of Valles Marineris: Implications for erosional and structural history
Baerbel K. Lucchitta, N.K. Isbell, Elpitha Howington-Kraus
1994, Journal of Geophysical Research E: Planets (99) 3783-3798
Compilation of a simplified geologic/geomorphic map onto digital terrain models of the Valles Marineris permitted an evaluation of elevations in the vicinity of the troughs and the calculation of depth of troughs below surrounding plateaus, thickness of deposits inside the troughs, volumes of void spaces above geologic/geomorphic units, and volumes...
The economics of wildlife and the CRP
Richard L. Johnson, Earl Ekstrand, J. R. McKean, K. John
1994, Book, When Conservation Reserve Program contracts expire: the policy options
No abstract available....
Hubble Space Telescope observations of comet P/Shoemaker-Levy 9 (1993e)
H. A. Weaver, P. D. Feldman, M. F. A’Hearn, C. Arpigny, R.A. Brown, E. F. Helin, D. H. Levy, B. G. Marsden, K. J. Meech, S. M. Larson, K. S. Noll, J. V. Scotti, Z. Sekanina, C.S. Shoemaker, E.M. Shoemaker, T. E. Smith, A. D. Storrs, D. K. Yeomans, B. Zellner
1994, Science (263) 787-791
The Hubble Space Telescope observed the fragmented comet P/Shoemaker-Levy 9 (1993e) (P indicates that it is a periodic comet) on 1 July 1993. Approximately 20 individual nuclei and their comae were observed in images taken with the Planetary Camera. After subtraction of the comae light, the 11 brightest nuclei have...
Lake-atmosphere feedbacks associated with paleolakes Bonneville and Lahontan
S. W. Hostetler, F. Giorgi, G. T. Bates, P. J. Bartlein
1994, Science (263) 665-668
A high-resolution, regional climate model nested within a general circulation model was used to study the interactions between the atmosphere and the large Pleistocene lakes in the Great Basin of the United States. Simulations for January and July 18,000 years ago indicate that moisture provided by synoptic-scale atmospheric circulation features...
