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Full-Text Articles in Physical Sciences and Mathematics
Reply [To “Comment On ‘Topographic And Volcanic Asymmetry Around The Red Sea: Constraints On Rift Models’”], Timothy H. Dixon, Erik R. Ivins, Brenda J. Franklin
Reply [To “Comment On ‘Topographic And Volcanic Asymmetry Around The Red Sea: Constraints On Rift Models’”], Timothy H. Dixon, Erik R. Ivins, Brenda J. Franklin
School of Geosciences Faculty and Staff Publications
No abstract provided.
Preliminary Determination Of Pacfic-North America Relative Motion In The Southern Gulf Of Calfornia Using The Global Positioning System, Timothy H. Dixon, G. Gonzalez, S. M. Lichten, D. M. Tralli, G. E. Ness, J. P. Dauphin
Preliminary Determination Of Pacfic-North America Relative Motion In The Southern Gulf Of Calfornia Using The Global Positioning System, Timothy H. Dixon, G. Gonzalez, S. M. Lichten, D. M. Tralli, G. E. Ness, J. P. Dauphin
School of Geosciences Faculty and Staff Publications
Global Positioning System (GPS) data from experiments conducted in 1985 and 1989 in the southern Gulf of California, Mexico, allow a determination of relative motion between the Pacific and North American plates. The data indicate motion of Cabo San Lucas on the Pacific plate relative to North America at a rate of 47±7 mrn/yr and azimuth of 57±6° west of north (1σ errors), equivalent within uncertainties to the NUVEL-1 global plate motion model.
An Introduction To The Global Positioning System And Some Geological Applications, Timothy H. Dixon
An Introduction To The Global Positioning System And Some Geological Applications, Timothy H. Dixon
School of Geosciences Faculty and Staff Publications
Receivers equipped to measure dual frequency carrier phase signals from satellites of the Global Positioning System (GPS) have been capable, under special conditions, of determining relative horizontal positions among stations separated by one to a few hundred kilometers with a precision of one to several millimeters since the early 1980s. The major obstacles to making this capability routine, extending it to all parts of the globe, and extending it to longer station separations, have been equipment cost, limitations in the GPS satellite constellation, arduous data analysis, uncertainties in satellite orbits, uncertainties in propagation delays associated with variable tropospheric water vapor, …
First Epoch Geodetic Measurements With The Global Positioning System Across The Northern Caribbean Plate Boundary Zone, Timothy H. Dixon, G. Gonzalez, S. M. Lichten, E. Katsigris
First Epoch Geodetic Measurements With The Global Positioning System Across The Northern Caribbean Plate Boundary Zone, Timothy H. Dixon, G. Gonzalez, S. M. Lichten, E. Katsigris
School of Geosciences Faculty and Staff Publications
The first geodetic survey across the northern Caribbean plate boundary zone with the Global Positioning System (GPS) was conducted in June 1986. Baseline vectors defined by the six station regional GPS network ranged from 170 to 1260 km in length. Repeatability of independent daily baseline estimates was better than 8 mm plus 1.3 parts in 108 of baseline length for horizontal components. The wet tropospheric path delay during the experiment was both high, sometimes exceeding 30 cm at zenith, and variable, sometimes exceeding 5 cm variation over several hours. Successful carrier phase cycle ambiguity resolution (“bias fixing”) could not …
Observations On The Biology Of Spelaelacris Tabulae Peringuey (Orthoptera, Rhaphidophoridae), From The Wynberg Cave (Capetown, South Africa), Gianmaria Carchini, Claudio Di Russo, Mauro Rampini
Observations On The Biology Of Spelaelacris Tabulae Peringuey (Orthoptera, Rhaphidophoridae), From The Wynberg Cave (Capetown, South Africa), Gianmaria Carchini, Claudio Di Russo, Mauro Rampini
International Journal of Speleology
Data on the age structure, fecundity, egg morphology and feeding habits of the Spelaeiacris tabulae population from Wynberg cave are reported and compared with other Rhaphidophoridae species. S. tabulae shows a certain degree of adaptation to cave life, as usual in the other temperate species of Rhaphidophoridae.
Population Size Of Pyrenean Troglobiont Coleopters (Speonomus Species) In A Cave In Belgium, Raymond Tercafs, Christine Brouwir
Population Size Of Pyrenean Troglobiont Coleopters (Speonomus Species) In A Cave In Belgium, Raymond Tercafs, Christine Brouwir
International Journal of Speleology
The population size of three troglobitic species of Speonomus (Coleoptera Bathysciinae) from the Pyrenees, intentionally introduced in 1969-1970 into the “Grotte de Ramioul” cave (Province of Liège, Belgium) has been studied using the mark-recapture technique. It has been shown that the three cave levels possess large Speonomus populations (upper network: 12,718; middle network: 13,902; lower network: 18,249 individuals) and that the superficial underground environment is also colonized, including the schist area. The most abundant species is Speonomus longicornis (relative frequency between 0.73 to 0.89). The two other species are present in the relative frequency between 0.04 and 0.23 for S. …
Metabolic Efficiency And Regulation Of Body Weight: A Comparison Between Life In Hypogean And Epigean Ecosystems, Jayant Biswas
Metabolic Efficiency And Regulation Of Body Weight: A Comparison Between Life In Hypogean And Epigean Ecosystems, Jayant Biswas
International Journal of Speleology
In the present study metabolic efficiency in the epigean and hypogean populations of Nemacheilus evezardi (Day) was examined. Different experiments were conducted, in both populations, by keeping them either in restricted oxygen or restricted feeding conditions, including starvation. Results clearly show that the rate of oxygen consumption for the hypogean population was significantly less as compared to its epigean counterpart. Further, results also suggest that the hypogean population has a tremendous capacity to maintain its metabolic activity and regulate its body weight under severe conditions characterized by an absence or a limited supply of food.
Speciation Of Troglobites: Studies In The San Antonio Cave (Oaxaca, Mexico), Horst Wilkens, Peter Junge, Thomas G. Langecker
Speciation Of Troglobites: Studies In The San Antonio Cave (Oaxaca, Mexico), Horst Wilkens, Peter Junge, Thomas G. Langecker
International Journal of Speleology
The phylogenetically young species community of San Antonio Cave (Oaxaca, Mexico) exemplifies the hypothesis that speciation of troglobites can occur in close contact with epigean predecessors. In a subterranean creek which continues outside with a rich epigean fauna, four troglobitic aquatic crustacean and one fish species (Rhamdia reddelli, Pimelodidae) were studied. Today not a single surface specimen can be found in the cave waters although several epigean species are troglophilic and/or are the ancestors of cave forms in other parts of Mexico. The absence of epigean invaders is attributed to the presence of specimens of some of the …
Revision Of The Genus Troglophilus (Orthoptera, Rhaphidophoridae) In Crete, Greece, Dimitrios Kollaros, Kaloust Paragamian, Anastassios Legakis
Revision Of The Genus Troglophilus (Orthoptera, Rhaphidophoridae) In Crete, Greece, Dimitrios Kollaros, Kaloust Paragamian, Anastassios Legakis
International Journal of Speleology
The genus Troglophilus (Orthoptera, Rhaphidophoridae) from Crete is revised using new data from specimens collected recently. The three previously reported species are considered to be only one, T. spinulosus, on the basis of morphological, ecological and distributional similarities. The species is more fully described and notes are given on its ecology.