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  • 1
    Publication Date: 2019-07-13
    Description: Progress in the determination of relations of MAGSAT anomalies to lithospheric structures is reported. The prime emphasis was on a Rayleigh wave study and the determination of both group and phase velocity dispersion.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E83-10208 , NASA-CR-170054 , NAS 1.26:170054
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  • 2
    Publication Date: 2019-07-13
    Description: Progress continues on all aspects of the project. The prime emphasis is on the Rayleigh wave study and determination of both group and phase velocity dispersion is almost complete. Existing data sets were prepared for inversion. A paper on the relation of MAGSAT anomalies to the main tectonic provinces of South America was delivered at the annual meeting of the Society of Exploration Geophysicists.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E83-10132 , NASA-CR-169760 , NAS 1.26:169760
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  • 3
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E79-10066 , NASA-CR-157965
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  • 4
    Publication Date: 2019-07-13
    Description: Comparison of MAGSAT scalar magnetic anomaly data to the main tectonic provinces and boundaries of South America reveals a number of geologic correlations. South America is divisible into a broad platform of Precambrian shields and cratons separated by Phanerozoic basins, grabens and aulacogens to the east, the Phanerozoic Patagonian Platform to the south, and the Mesozoic to Cenozoic Andean Fold Belt and Caribbean Mountain System to the west and north. The continental shields are mainly more magnetic then continental basins and orogenic belts. Cratons, mainly covered by younger sedimentary rocks, are generally associated with magnetic gradients. Most of the anomalies associated with the Patagonian Platform are positive and have higher amplitudes eastward away from the Andean Fold Belt. The northern Andes are coincident with positive magnetic anomalies, whereas the central and southern Andes are associated mainly with negative anomalies.
    Keywords: GEOPHYSICS
    Type: Texas Univ. Appl. of MAGSAT to Lithospheric Modeling in South America, Part 2; p 52-58|Ann. Intern. Meeting and Exposition of the Soc. of Exploration Geophysicists; Jan 01, 1982; Dallas, TX; United States
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  • 5
    Publication Date: 2019-07-13
    Description: Some MAGSAT scalar and vector magnetic anomaly data together with regional gravity anomaly data are being used to investigate the regional tectonic features of the South American Plate. An initial step in this analysis is three dimensional modeling of magnetic and gravity anomalies of major structures such as the Andean subduction zone and the Amazon River Aulacogen at satellite elevations over an appropriate range of physical properties using Gaus-Legendre quadrature integration method. In addition, one degree average free-air gravity anomalies of South America and adjacent marine areas are projected to satellite elevations assuming a spherical Earth and available MAGSAT data are processed to obtain compatible data sets for correlation. Correlation of these data sets is enhanced by reduction of the MAGSAT data to radial polarization because of the profound effect of the variation of the magnetic inclination over South America.
    Keywords: GEOPHYSICS
    Type: Texas Univ. Appl. of MAGSAT to Lithospheric Modeling in South America, Part 2; p 33|IAGA Sci. Assembly; Aug 03, 1981 - Aug 15, 1981; Edinburgh
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  • 6
    Publication Date: 2019-07-13
    Description: Intensities of MAGSAT scalar magnetic anomaly data correlate with the main tectonic provinces of South America and the Caribbean region. Magnetic anomalies of the continents generally have higher amplitudes than oceanic anomalies. This is particularly evident in Central America and in the shield areas of South America. The Caribbean Sea and Gulf of Mexico are underlain by prominent magnetic minima. Within these oceanic areas, linear magnetic highs correlate with topographic ridges which separate the Gulf of Mexico, the Colombian Basin, and the Venezuelan Basin. The boundaries of the Caribbean plate occur along magnetic gradients which are particularly sharp along the northern and western margins of the plate, but gradational along the southern margin where they merge with the Andean Cordillera. The anomalies along the western margin of the South American plate are also distinct and appear to be separate from those of the adjacent ocean basin. Eastern South America is characterized by magnetic anomalies which commonly extend into the Atlantic Ocean.
    Keywords: GEOPHYSICS
    Type: Caribbean Geol. Conf.; Aug 01, 1983; Cartagena; Colombia|Texas Univ. Appl. of MAGSAT to Lithospheric Modeling in South America, Part 2; p 27-28
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  • 7
    Publication Date: 2019-07-13
    Description: Geologic studies of the South American plate were undertaken. The Guayana shield is reasonably well studied, and although data are sparce, the central Brazilian shield appears similar. Both the Amazon and Parnaiba basins seem to be related to an aulocogen structure. The collection of crustal structure information and the generation of measurement of surface wave dispersion in the shield areascontinues. Long period seismograms are digitized and analyzed. Exisiting crusted and upper mantle studies were indexed. Both MAGSAT scaler and vector magnetic anomaly data were used with regional gravity anomaly data to investigate the regional tectonic features of the South American plate.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10196 , NASA-CR-168623 , NAS 1.26:168623
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  • 8
    Publication Date: 2019-07-13
    Description: Approximately 50 seismograms obtained from the National Geophysical and Solar-Terrestrial Data Center were digitized and analysis of surface wave dispersion was begun.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E83-10038 , NASA-CR-169510 , NAS 1.26:169510
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  • 9
    Publication Date: 2019-07-13
    Description: A preliminary crustal structure map and a bibliography of crustal and upper mantle studies for South America are given. Work on the surface wave analysis and tectonic characterizations continues.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10319 , NASA-CR-168898 , NAS 1.26:168898
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  • 10
    Publication Date: 2019-07-13
    Description: While data is available on the lithospheric and crustal structure of the Andes region of South America, there is limited knowledge of these aspects of the eastern portion of the continent. For this reason, a surface wave dispersion study of the area was initiated. Long period seismograms were obtained for a tripartite analysis of dispersion. A flow chart of the analysis to be conducted is presented along with a preliminary geologic/tectonic map that was prepared. Efforts to characterize the provinces identified in terms of their geological and geophysical parameters continue.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E81-10092 , NASA-CR-164090
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