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Articles 1 - 23 of 23
Full-Text Articles in Physical Sciences and Mathematics
Cinder Cone Clustering In The Transmexican Volcanic Belt: Implications For Structural And Petrologic Models, Charles B. Connor
Cinder Cone Clustering In The Transmexican Volcanic Belt: Implications For Structural And Petrologic Models, Charles B. Connor
School of Geosciences Faculty and Staff Publications
Cinder cone distributions have most often been characterized using univariate statistics. Here a new technique to volcano distribution studies, cluster analysis, is applied to cinder cone distribution in the central TransMexican Volcanic Belt (TMVB). A total of 1016 cinder cones are identified over an area of approximately 60,000 km2. Application of cluster analysis reveals structure in cinder cone distribution. Using a search radius parameter of 16 km, 75% of the cinder cones within the central TMVB are found within eight clusters of 45–159 cones each. These clusters are each 2000 to 5000 km2 in area. Only 22 cones are found …
Justification For Continued Variance From The Hookers Point Awwtp Effluent Limitations For Phosphorous (1 Mg/L), City Of Tampa Department Of Sanitary Sewers
Justification For Continued Variance From The Hookers Point Awwtp Effluent Limitations For Phosphorous (1 Mg/L), City Of Tampa Department Of Sanitary Sewers
Reports
The Environmental Protection Commission of Hillsborough County requested on August 29, 1990 that the City of Tampa, Department of Sanitary Sewers, supply information which would provide justification for continued variance from the 1 mg/l effluent limitations of phosphorous for the Hookers Point AWWTP. It was also requested that long-term water quality trends in Hillsborough Bay and Tampa Bay be documented in support of the phosphorous variance.
Gps Measurements Of Regional Deformation In Southern California: Some Constraints On Performance, Timothy H. Dixon, G. Blewitt, K. Larson, D. Agnew, B. Hager, P. Kroger, L. Krumega, W. Strange
Gps Measurements Of Regional Deformation In Southern California: Some Constraints On Performance, Timothy H. Dixon, G. Blewitt, K. Larson, D. Agnew, B. Hager, P. Kroger, L. Krumega, W. Strange
School of Geosciences Faculty and Staff Publications
Geodetic measurements are an important tool for understanding plate boundary zone deformation. They provide data on fault motion rates and indirectly provide constraints on crustal rheology, earthquake processes, and evolution of geologic structures. In southern California the pattern of strain resulting from interaction of the Pacific and North American plates is very complex, and a robust geodetic experiment requires dense spatial sampling. In addition, the signals of interest may have strain rates smaller than 10−7/yr. Taken together, these conditions imply the need for geodetic techniques that are both economical, enabling large numbers of measurements, and highly accurate. Conventional …
A Study For The Improvement, Restoration, And Protection Of Lake Bruce, Fulton And Pulaski Counties Indiana, William B. Eviston, Thomas Crisman, Eric P. Ellingson
A Study For The Improvement, Restoration, And Protection Of Lake Bruce, Fulton And Pulaski Counties Indiana, William B. Eviston, Thomas Crisman, Eric P. Ellingson
School of Geosciences Faculty and Staff Publications
No abstract provided.
A Final Feasibility Report Submitted To Sylvan Lake Improvement Association, Inc, Thomas Crisman
A Final Feasibility Report Submitted To Sylvan Lake Improvement Association, Inc, Thomas Crisman
School of Geosciences Faculty and Staff Publications
No abstract provided.
Compliance Monitoring And Long-Term Water Quality And Biological Indicator Trends In Hillsborough Bay Initial Report, City Of Tampa Department Of Sanitary Sewers
Compliance Monitoring And Long-Term Water Quality And Biological Indicator Trends In Hillsborough Bay Initial Report, City Of Tampa Department Of Sanitary Sewers
Reports
This is the second 1990 report to FDER to satisfy the requirements set forth in specific condition #6 of FDER construction permit DC29-152790. This report includes trend analyses of water quality parameters and biological indicators of water quality collected by us, and the Hillsborough County Environmental Protection Commission (HCEPC).
Comment On “Timing Of Mantle Upwelling: Evidence For A Passive Origin For The Red Sea Rift” By A. V. Mcguire And R. G. Bohannon, Timothy H. Dixon
Comment On “Timing Of Mantle Upwelling: Evidence For A Passive Origin For The Red Sea Rift” By A. V. Mcguire And R. G. Bohannon, Timothy H. Dixon
School of Geosciences Faculty and Staff Publications
No abstract provided.
The Effect Of Tracking Network Configuration On Gps Baseline Estimates For The Casa Uno Experiment, S. Kornreich Wolf, Timothy H. Dixon, J. T. Freymuller
The Effect Of Tracking Network Configuration On Gps Baseline Estimates For The Casa Uno Experiment, S. Kornreich Wolf, Timothy H. Dixon, J. T. Freymuller
School of Geosciences Faculty and Staff Publications
Geodetic monitoring of subduction of the Nazca and Cocos plates is a goal of the CASA (Central and South America) Global Positioning System (GPS) experiments, and requires measurement of intersite distances (baselines) in excess of 500 km. The major error source in these measurements is the uncertainty in the position of the GPS satellites at the time of observation. A key aspect of the first CASA experiment, CASA Uno, was the initiation of a global network of tracking stations to minimize these errors. We studied the effect of using various subsets of this global tracking network on long (>100 …
First Gps Baseline Results From The North Andes, James N. Knellogg, Jeffrey T. Freymuller, Timothy H. Dixon, Ruth E. Neilan, Ropain U. Clemente, M. Camargo Sergio, Fernandez Ch. Benjamin, James L. Stowell, Anibal Salazai, Mora V. Jaime, Luis Espin, Vernon Perdue, Leonard Leos
First Gps Baseline Results From The North Andes, James N. Knellogg, Jeffrey T. Freymuller, Timothy H. Dixon, Ruth E. Neilan, Ropain U. Clemente, M. Camargo Sergio, Fernandez Ch. Benjamin, James L. Stowell, Anibal Salazai, Mora V. Jaime, Luis Espin, Vernon Perdue, Leonard Leos
School of Geosciences Faculty and Staff Publications
The CASA UNO GPS (Global Positioning System) experiment (January-February 1988) has provided the first epoch baseline measurements for the study of plate motions and crustal deformation in and around the North Andes. Two dimensional horizontal baseline repeatabilities are as good as 5 parts in 108 for short baselines (100–1000 km), and better than 3 parts in 108 for long baselines (>1000 km). Vertical repeatabilities are typically 4–6 cm, with a weak dependence on baseline length. The expected rate of plate convergence across the Colombia Trench is 6–8 cm/yr, which should be detectable by the repeat experiment planned …
Seagrass And Caulerpa Monitoring In Hillsborough Bay Initial Report, City Of Tampa Department Of Sanitary Sewers
Seagrass And Caulerpa Monitoring In Hillsborough Bay Initial Report, City Of Tampa Department Of Sanitary Sewers
Reports
The City of Tampa, Bay Study Group (BSG), has monitored the effects of sewage pollution abatement in Hillsborough Bay since 1976. Within the last decade, water quality improvements and evidence of minor seagrass revegetation in Hillsborough Bay prompted the BSG to initiate a seagrass study to compliment other programs assessing the environmental status of Hillsborough Bay.
Central And South America Gps Geodesy - Casa Uno, James N. Kellog, Tim Dixon
Central And South America Gps Geodesy - Casa Uno, James N. Kellog, Tim Dixon
School of Geosciences Faculty and Staff Publications
In January 1988, scientists from over 25 organizations in 13 countries and territories cooperated in the largest Global Positioning System (GPS) campaign in the world to date (Table 1). 43 GPS receivers collected approximately 590 station-days of data in American Samoa, Australia, Canada, Colombia, Costa Rica, Ecuador, New Zealand, Norway, Panama, Sweden, United States, West Germany, and Venezuela. The experiment was entitled CASA UNO, an acronym for Central and South America – and uno is the Spanish word for one, designating first epoch measurements. The CASA UNO experiment was the first civilian effort implementing a global GPS satellite tracking network. …
Some Tests Of Wet Tropospheric Calibration For The Casa Uno Global Positioning System Experiment, Timothy H. Dixon, S. Kornreich Wolf
Some Tests Of Wet Tropospheric Calibration For The Casa Uno Global Positioning System Experiment, Timothy H. Dixon, S. Kornreich Wolf
School of Geosciences Faculty and Staff Publications
Wet tropospheric path delay can be a major error source for Global Positioning System (GPS) geodetic experiments. We investigate strategies for minimizing this error using data from CASA Uno, the first major GPS experiment in Central and South America, where wet path delays may be both high and variable. We compared wet path delay calibration using water vapor radiometers (WVRs) and residual delay estimation, with strategies where the entire wet path delay is estimated stochastically without prior calibration, using data from a 270 km test baseline in Costa Rica. Both approaches yield centimeter-level baseline repeatability and similar tropospheric estimates, suggesting …
A Study For The Improvement, Restoration, And Protection Of Mill Pond, William B. Eviston, Thomas Crisman, Eric P. Ellingson
A Study For The Improvement, Restoration, And Protection Of Mill Pond, William B. Eviston, Thomas Crisman, Eric P. Ellingson
School of Geosciences Faculty and Staff Publications
No abstract provided.
Draft- Nitrogen Loading And Ambient Chlorophyll-A In Hillsborough Bay (Tampa Bay), Florida: An Eutrophication Management Strategy, J.O. R. Johansson
Draft- Nitrogen Loading And Ambient Chlorophyll-A In Hillsborough Bay (Tampa Bay), Florida: An Eutrophication Management Strategy, J.O. R. Johansson
Reports
The present report examines the past and current relationship between nitrogen loadings and ambient chlorophyll-a eutrophic subdivision of Tampa Bay (Task 1). A management strategy for eutrophication abatement, involving the reduction of present nitrogen loadings to levels which will sustain the desirable chlorophyll-a concentration and support persistent seagrass growth in the near future, is also presented for Hillsborough Bay (Task 3). The urgent need for a comprehensive long-term water quality and loading source monitoring program, specifically for Hillsborough Bay, is also discussed (Task 4).
1990 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
1990 File Geodatabase Containing Aerial Photos, Pete Reehling, Richard Mckenzie, City Of Tampa Department Of Sanitary Sewers Bay Study Group
Images
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the aerial photos for the year 1990.
Rupture Process Of The Macquarie Ridge Earthquake Of May 23, 1989, Jochen Braunmiller, John Nábělek
Rupture Process Of The Macquarie Ridge Earthquake Of May 23, 1989, Jochen Braunmiller, John Nábělek
School of Geosciences Faculty and Staff Publications
Broadband body waves recorded at 15 digital seismic stations worldwide are used to study the rupture process of the May 23, 1989 Macquarie Ridge earthquake. The centroidal solution (strike 211°, dip 86°, rake 180°, and depth of 10 km below the seafloor) indicates shallow rupture with pure right-lateral strike-slip motion along the Pacific-Australia plate boundary, in agreement with motion predicted by plate tectonic models. The total seismic moment is 13.4×1020 Nm, 80% of which was released in the first 24 s of the rupture process. Modeling favors a bilaterally propagating rupture with slightly different dip and rake for the …
1990 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
1990 File Geodatabase Containing Photo Point Locations, Aerial Photos, And Flight Maps, City Of Tampa Department Of Sanitary Sewers Bay Study Group, Pete Reehling, Richard Mckenzie
Data Sets
The Bay Study Group was created by the City of Tampa in 1976 to monitor the effects of pollution abatement that occurred in Hillsborough Bay when the city’s wastewater treatment plant was upgraded from primary to advanced treatment in 1979. The Bay Study Group documented a remarkable restoration of water quality parameters and biological indicators in Hillsborough Bay from the mid 1980s until 2009, when it was disbanded. This zip Geodatabase file contains the photo point locations, aerial photos, and flight maps for the year 1990.
Secondary Sympatric Occurrence Of Sibling Species Of Subterranean Shrimps In The Karst, M. Cobolli Sbordoni, M. Mattoccia, G. La Rosa, E. De Matthaeis, V. Sbordoni
Secondary Sympatric Occurrence Of Sibling Species Of Subterranean Shrimps In The Karst, M. Cobolli Sbordoni, M. Mattoccia, G. La Rosa, E. De Matthaeis, V. Sbordoni
International Journal of Speleology
Allozyme variation at 32 gene loci was studied in cave dwelling shrimps of the genus Troglocaris (fam. Atyidae). Populations were collected from several caves and wells belonging to different drainage systems in the Karst areas of NE Italy. Results suggest the existence of two sympatric, genetically distinct, biological species (provisionally indicated as species A and B in the T. anophthalmus complex) in the samples collected at the Duino Well, Sagrado and Comarie caves (Nei’s `D= 0.209). Samples from Gradisca and Aurisina are represented by only one (A) or the other (B) of the two species, respectively. Two remaining eastern populations …
Ultrastructure Des Sensilles Cylindriques, Mécanorécepteurs D'Un Crustacé Mysidacé Souterrain, Yves Crouau
Ultrastructure Des Sensilles Cylindriques, Mécanorécepteurs D'Un Crustacé Mysidacé Souterrain, Yves Crouau
International Journal of Speleology
The ultrastructural features of a new chordotonal sensillum in a cavernicolous Mysidacea is described. That sensillum and the other mechanoreceptor sensilla of the same Mysidacea are compared. 9 + 0 cilia show ultrastructural features which previously allowed us to establish a hypothesis with respect to the mode of functioning of chordotonal sensilla. That sensillum shows a pore at the tip of its external receptor.
Laboratory Studies Of Predatory Behaviour In Two Subspecies Of The Carabid Cave Beetle: Neaphaenops Tellkampfi, David M. Griffith
Laboratory Studies Of Predatory Behaviour In Two Subspecies Of The Carabid Cave Beetle: Neaphaenops Tellkampfi, David M. Griffith
International Journal of Speleology
Comparative studies on the foraging behaviour of Neaphaenops tellkampfi tellkampfi and N. t. meridionalis demonstrated adaptation to different environments. The southern subspecies N. t. meridionalis, which is found in wet muddy caves where cave cricket eggs are unlikely prey, did not locate buried cricket eggs and dug fewer and less accurate holes in the lab than the nominate subspecies. N. t. tellkampfi, which reaches high densities in sandy deep cave environments where cricket eggs are the only viable prey, gained significantly greater weight than meridionalis when presented buried cricket eggs as prey. There was no difference with respect …
Isopoda (Crustacea: Isopoda: Microcharon, Jaera, Proasellus) And Other Fauna In Hypogean Waters Of Southern Cyprus, Boris Sket
International Journal of Speleology
Springs and wells in SW and S part of Cyprus were briefly surveyed. Chlorinity was 0.1 - 0.8 p.p.t. Some isopods were found in collecting galleries of springs and in wells in calcarenites and in gravel deposits. These were Proasellus coxalis ssp. with some depigmented specimens, the probably stygobitic P. c. nanus ssp. n., poorly pigmented Jaera italica, and Microcharon luciae n. sp.; they were accompanied by the stygobitic amphipod Bogidiella cypria, by Turbellaria (Tricladida), by Copepoda (Cyclopoida), and rarely by some other animals (Pisidium sp., Oligochaeta). Only slightly depigmented Turbellaria Tricladida (cf. Dugesia sp.) occur in …
Two New Niphargus Species (Amphipoda) From Caves In Yugoslavia, Gordan Karaman, Boris Sket
Two New Niphargus Species (Amphipoda) From Caves In Yugoslavia, Gordan Karaman, Boris Sket
International Journal of Speleology
Niphargus numerus sp. n. from the Čavlinska pećina near Obrovac (Dalmatia) and N. factor sp. n. from Vjetrenica (Hercegovina) are described. Both new species from Yugoslav caves belong to the N. transitivus aggregate of species.
Troglobius Coprophagus, A New Genus And Species Of Cave Collembola From Madagascar, With Notes On Its Ecology, José G. Palacios-Vargas, Jane Wilson
Troglobius Coprophagus, A New Genus And Species Of Cave Collembola From Madagascar, With Notes On Its Ecology, José G. Palacios-Vargas, Jane Wilson
International Journal of Speleology
Troglobius coprophagus n. g., n. sp. a cave Collembola from Madagascar is characterized by an elongate and serrate mucro, a non spines dens. Description and illustrations of the new genus and species are given. Some ecological data of this highly cave adapted species is also included.