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  • 1
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    The passive margins of northern Europe and East-Greenland (1982)
    Am. Geophys. Union & Geol. Soc. Am.
    In:  Professional Paper, Dynamics of Passive Margins, Denver, 284 pp., Am. Geophys. Union & Geol. Soc. Am., vol. 4, no. 16, pp. 30-44, (ISBN 1-4020-1729-4)
    Details
    Publication Date: 1982
    Keywords: Plate tectonics ; Tectonics ; Geol. aspects
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Apollo 17 Traverse Gravimeter Experiment (Preliminary Results) (1976)
    In:  Geologisches Jahrbuch Reihe E Geophysik - geophysics, Washington, D.C., AGU, vol. 76, no. E7, pp. 85-91, pp. 2568, (ISSN: 1340-4202)
    Details
    Publication Date: 1976
    Keywords: Planetology ; moon ; Gravimetry, Gravitation
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Reykjanes Ridge crest: a detailed geophysical study (1971)
    In:  J. Geophys. Res., Washington, D.C., AGU, vol. 76, no. B12, pp. 473-517, pp. 2568, (ISSN: 1340-4202)
    Details
    Publication Date: 1971
    Keywords: Plate tectonics ; Iceland ; Deep seismic sounding (espec. cont. crust) ; Review article ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Atlantic Rifts and Continental Margins (2000)
    Am Geophys. Un.
    In:  Washington, 354 pp., Am Geophys. Un., vol. 115, no. 1, pp. 65-66, (ISBN 3-8273-7166-X)
    Details
    Publication Date: 2000
    Keywords: Textbook of geophysics ; Geol. aspects ; Plate tectonics ; paleo ; Geomagnetics ; Deep seismic sounding (espec. cont. crust) ; Gravimetry, Gravitation
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Traverse gravimeter experiment (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The primary goal of the traverse gravimeter experiment (TGE) was to make relative gravity measurements at a number of sites in the Apollo 17 landing area and to use these measurements to obtain information about the geological substructure. A secondary goal was to obtain the value of the gravity at the landing site relative to an accurately known value on earth. Both these goals were successfully achieved by the experiment. A gravity tie has been obtained between the Taurus-Littrow landing site and the earth with an estimated accuracy of approximately 5 mgal. Relative gravity measurements that can be used to infer the substructure of the area have been obtained at stations visited during each period of extravehicular activity (EVA).
    Keywords: SPACE SCIENCES
    Type: NASA. Johnson Space Center Apollo 17 Prelim. Sci. Rept.; 13 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Shape of the ocean surface and implications for the Earth's interior: GEOS-3 results (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A new set of 1 deg x 1 deg mean free air anomalies was used to construct a gravimetric geoid by Stokes' formula for the Indian Ocean. Utilizing such 1 deg x 1 deg geoid comparisons were made with GEOS-3 radar altimeter estimates of geoid height. Most commonly there were constant offsets and long wavelength discrepancies between the two data sets; there were many probable causes including radial orbit error, scale errors in the geoid, or bias errors in altitude determination. Across the Aleutian Trench the 1 deg x 1 deg gravimetric geoids did not measure the entire depth of the geoid anomaly due to averaging over 1 deg squares and subsequent aliasing of the data. After adjustment of GEOS-3 data to eliminate long wavelength discrepancies, agreement between the altimeter geoid and gravimetric geoid was between 1.7 and 2.7 meters in rms errors. For purposes of geological interpretation, techniques were developed to directly compute the geoid anomaly over models of density within the Earth. In observing the results from satellite altimetry it was possible to identify geoid anomalies over different geologic features in the ocean. Examples and significant results are reported.
    Keywords: GEOSCIENCES (GENERAL)
    Type: NASA-CR-156859
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Detailed 1 x 1 deg gravimetric Indian Ocean geoid and comparison with GEOS-3 radar altimeter geoid profiles (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A new set of 1 x 1 deg mean free-air anomalies in the Indian Ocean is determined on the basis of previously published free-air anomaly maps (Talwani and Kahle, 1975) and the most recent Lamont surface ship gravity measurements. The data are then used to compute a (total) 1 x 1 deg gravimetric Indian Ocean geoid. The computation is carried out by combining the Goddard Space Flight Center (GSFC) GEM-6 geoid and a difference geoid that corresponds to the differences between the set of 1 x 1 deg surface gravity values and the GEM-6 gravity anomalies. The difference geoid is highest over the Madagascar Ridge (+20 m) and lowest over the Timor Trough (-30 m). The total geoid is compared with GEOS-3 radar altimeter-derived geoid profiles, and geophysical implications are discussed.
    Keywords: GEOPHYSICS
    Type: Geophysical Journal; 55; Dec. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Apollo 17 traverse gravimeter experiment /Preliminary results/ (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Preliminary results of the traverse gravimeter experiment successfully performed during the Apollo 17 mission are discussed. An earth-moon gravity tie was established. On the basis of several readings, a gravity value of 162,695 + or - 5 mgal was obtained at the lunar-module landing site in the Taurus-Littrow valley. Free-air and Bouguer corrections were applied to the gravity data. The resultant Bouguer anomaly, analyzed with a two-dimensional approximation, shows a relative gravity maximum of about 25 to 30 mgal over the Taurus-Littrow valley. This maximum is interpreted in terms of a 1-km-thick block of basalt flow with a positive density contrast of 0.8 g/cu cm relative to the highland material on either side.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Analysis and geological interpretation of gravity data from GEOS-3 altimeter (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A number of detailed gravimetric geoids of portions of the world's oceans from marine gravity measurements were constructed. The geoids were constructed by computing 1 x 1 deg or 10 x 10 deg averages of free-air anomaly data and subtracting these values from currently used satellite derived Earth models. The resulting difference gravity anomalies are then integrated over a sphere using a simplified form of Stoke's equation to obtain a difference geoid. This difference geoid is added to the satellite derived model to obtain a 1 x 1 deg or 10 x 10 deg total gravimetric geoid. The geoid undulations are studied by comparison of the altimeter measurements with the morphology of the ocean floor. Utilizing a combination of altimetry data, gravity and seismic reflection data, geophysical models of the earth can be constructed.
    Keywords: GEOPHYSICS
    Type: NASA-CR-156849
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Comparison of gravimetric geoids with GEOS 3 altimetric geoid (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper examines how well GEOS 3 radar altimeter estimates of geoid height compare with data from independently determined gravimetric geoids. To this end, GEOS 3 altimeter estimates of geoid height are compared with 1 by 1 deg gravimetric geoids in the North Atlantic, Northwest Pacific, and Indian oceans. There exist constant offsets and long-wavelength discrepancies between the two sets of data. Although some difficulties exist with constant offset and long-wavelength discrepancies, the GEOS 3 radar altimeter appears to detect geological features such as deep-sea trenches and is an excellent instrument for acquiring measurements of the shape of the ocean surface.
    Keywords: GEOPHYSICS
    Type: AD-A078760 , Journal of Geophysical Research; 84; July 30
    Format: text
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    NASA TECHNICAL REPORTS
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