Results 141 to 150 of about 20,151 (197)

Accuracy of geoid undulation computations

Journal of Geophysical Research, 1973
Geoid undulations have been recently computed using a set of spherical harmonic potential coefficients and 1° × 1° mean free-air anomalies. The latter quantities are used in Stokes's equation out to some spherical radius ψ0 from the computation points.
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Regional assessment of high-degree combined global gravity field model for geoid modelling over Nigeria

Journal of Applied Geodesy
Given the multitude of global gravity field model (GGMs) at our disposal, evaluating them against independent data is indispensable for delineating their quality and ascertaining their accuracy in Nigeria regions.
Michael Bako
semanticscholar   +1 more source

Undulations in the Altimeter Derived Geoid: Geophysical Studies

1981
Satellite altimeter data have been revealed to be of very useful interest for the shape of the sea surface, thus for oceanography. However to extract the oceanographic signal from altimeter data, the shape of the geoid (the equipotential surface representing the earth gravity field) has to be known.
A. Cazenave, M. Lefebvre
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Pacific Plate motion and undulations in geoid and bathymetry

Earth and Planetary Science Letters, 1996
Abstract Previous studies have shown that the Pacific geoid and gravity fields exhibit lineated anomalies, trending approximately in the direction of absolute plate motion over the underlying mantle. Because the undulations obliquely cross fracture zones they have often been attributed a convective origin.
P. Wessel, L.W. Kroenke, D. Bercovici
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Estonian Geodetic and Gravimetric Networks and Geoid Undulation

1995
The national triangulation and levelling networks were founded in 1920–1940. The gravity netwoiks have been measured for several times between 1957 and 1991 according to how the precision of the measuring technique increased. Gravity measurements (scale 1:200000) in Estonian territory, which underlie all the geoid undulation determinations, were ...
A. Ostonen, J. Randjärv, H. Sildvee
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Use of potential coefficient models for geoid undulation determinations using a spherical harmonic representation of the height anomaly/geoid undulation difference

Journal of Geodesy, 1997
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Stress field estimation by the geoid undulations of the Samos-Kuşadası Bay and implications for seismogenic behavior

Acta Geophysica, 2021
B. Oruç, Emir Balkan
semanticscholar   +1 more source

Seasat altimetry and the South Atlantic Geoid: 2. Short‐wavelength undulations

Journal of Geophysical Research: Solid Earth, 1989
This paper is a discussion of the short‐wavelength (25–100 km) undulations of the geoid recovered from Seasat altimeter data in the South Atlantic. These undulations are known to be highly correlated to seafloor topography, and they considerably improve our knowledge about global bathymetry of the South Atlantic, which remains poorly surveyed.
Dominique Gibert, Vincent Courtillot, Jean‐Louis Olivet   +2 more
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Geoid undulations mapped by spaceborne radar altimetry

1986
Abstract Were the ocean and atmosphere at rest, the sea surface would describe a surface of constant gravitational potential. This equipotential surface is called the geoid. Removal of a simple reference surface (spheroid or ellipsoid) leaves geoid anomalies, or undulations of various wavelengths.
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On the possible thermal nature of the largest undulations of the geoid

Tectonophysics, 1977
Abstract It is assumed that major undulations of the geoid are generated by isolated anomalous masses. The idea of the method is to find depth of the equivalent point source of the anomaly and to correct this value for source flattening. It is found that, on the average, the depths of the mass centres of the largest anomalies lie in the range of 360 ...
Yu.A. Tarakanov, L.P. Vinnik, N.A. Chujkova   +2 more
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