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  • EARTH RESOURCES AND REMOTE SENSING  (9)
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  • 1
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    Application of MAGSAT to Lithospheric Modeling in South America. Part 2: Synthesis of Geologic and Seismic Data for Development of Integrated Crustal Models (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Research activities performed on MAGSAT scalar data over South America, Central America, and the adjacent marine areas are summarized. The geologic utility of magnetic anomalies detected by satellite is demonstrated by focusing on the spherical-Earth interpretation of scalar MAGSAT data in combination with ancillary geological and geophysical data to obtain lithospheric models for these regions related to their contemporary crustal dynamics processes, geologic history, current volcanism seismicity and natural resources.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E84-10126 , NASA-CR-172801 , NAS 1.26:172801
    Format: application/pdf
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  • 2
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    Crustal structure, geophysical models and contemporary tectonism of the Colorado Plateau (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A regional analysis of the crust and upper mantle of the Colorado Plateau is presented, using existing geophysical and geological data combined with new surface wave dispersion and groundwater geothermometry data; the tectonic implications of these models are also investigated. Surface wave and seismic refraction data indicate that the crust of the interior of the Colorado Plateau is 44 + or - 3 km thick, and its crustal structure is typical of stable continental areas. Pn velocities, however, appear to be lower (7.8 km/s) than would be expected in a stable region, while silica geothermometry indicates that the average heat flow for the plateau is 55 mW per sq m (1.3 HFU).
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Tectonophysics; 61; Dec. 30
    Format: text
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  • 3
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    Application of Magsat lithospheric modeling in South America. Part 1: Processing and interpretation of magnetic and gravity anomaly data (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Scalar magnetic anomaly data from MAGSAT, reduced to vertical polarization and long wavelength pass filtered free air gravity anomaly data of South America and the Caribbean are compared to major crustal features. The continental shields generally are more magnetic than adjacent basins, oceans and orogenic belts. In contrast, the major aulacogens are characterized by negative anomalies. Spherical earth magnetic modeling of the Amazon River and Takatu aulacogens in northeastern South America indicates a less magnetic crust associated with the aulacogens. Spherical earth modeling of both positive gravity and negative magnetic anomalies observed over the Mississippi Embayment indicate the presence of a nonmagnetic zone of high density material within the lower crust associated with the aulacogen. The MAGSAT scalar magnetic anomaly data and available free air gravity anomalies over Euro-Africa indicate several similar relationships.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E84-10115 , NASA-CR-173485 , NAS 1.26:173485
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  • 4
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    The crustal structure and tectonics of South America (1981)
    In:  CASI
    Details
    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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  • 5
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    Characterization of the structure and tectonic of South America (1981)
    In:  CASI
    Details
    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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  • 6
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    Application of MAGSAT to lithospheric modeling in South America (1983)
    In:  CASI
    Details
    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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  • 7
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    Application of MAGSAT to lithospheric modeling in South America (1982)
    In:  CASI
    Details
    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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  • 8
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    Evaluation of existing knowledge of the tectonic history and lithospheric structure of South America (1980)
    In:  CASI
    Details
    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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  • 9
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    Crustal and upper mantle structure data analysis (1982)
    In:  CASI
    Details
    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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