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  • 1
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    Gravimetric geoid in the Northwest Pacific Ocean (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A total of 3708 1 x 1 deg free-air gravity anomaly averages have been used to construct a new 1 x 1 deg gravimetric geoid of the Northwest Pacific Ocean. The 1 x 1 deg averages are based on a compilation of 147,000 surface ship and pendulum gravity measurements. Difference geoid undulations range from a maximum of +19 m over the Hawaiian ridge to a minimum of -31 m over the junction of the Kuril and Aleutian trenches. The Hawaiian swell is associated with a geoidal high of up to +15 m with wavelengths of about 2200 km and the topographic rises seaward of deep-sea trenches are associated with geoidal highs of up to 4 m with wavelengths of about 220-900 km. The agreement between the gravimetric geoid and Skylab-4 and Geos-3 altimeter data is close for wavelengths greater than about 300 km but poor for shorter wavelengths.
    Keywords: GEOPHYSICS
    Type: AD-A045731 , LDGO-2520 , Geophysical Journal; 50; 2, Au; Aug. 197
    Format: text
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  • 2
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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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  • 3
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    Present status of marine gravity (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The technique of measuring gravity at sea was greatly improved by the development of spring-type surface-ship gravimeters which can be operated in a wide variety of sea conditions. A brief review of the most recent developments in marine gravity is presented. The extent of marine gravity data coverage is illustrated in a compilation map of the world's free-air gravity anomaly maps of the world's oceans. A brief discussion of some of the main results in the interpretation of marine gravity is given. Some comments made on recent determinations of the gravity field in oceanic regions using satellite radar altimeters are also presented.
    Keywords: GEOPHYSICS
    Type: Ohio State Univ. Appl. of Geodesy to Geodyn., an Intern. Symp.; p 251-255
    Format: application/pdf
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  • 4
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    Observation of a north-south anisotropy of atmospheric radiation at balloon altitudes (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Measurements have been made of an azimuthal asymmetry of atmospheric radiation at balloon altitudes and mid-latitudes. The measured asymmetry is 6% peak to peak in the north-south direction at energies above 500 keV. A lack of east-west asymmetry indicates that the arrival direction of the atmospheric radiation is highly decoupled from that of the primary radiation. Present models of secondary atmospheric radiation production and transport do not quantitatively agree with the observations.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 81; Dec. 1
    Format: text
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  • 5
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    Comment on 'On global gravity anomalies and two-scale mantle convection' by Bruce D. Marsh and James G. Marsh (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: GEOPHYSICS
    Type: AD-A067818 , Journal of Geophysical Research; 83; July 10
    Format: text
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