Results 151 to 160 of about 1,527 (198)

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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Local Multiscale Modelling of Geoid Undulations from Deflections of the Vertical

Journal of Geodesy, 2006
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Freeden, W., Schreiner, M.
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Modelling local GPS/levelling geoid undulations using artificial neural networks

Journal of Geodesy, 2005
The use of GPS for establishing height control in an area where levelling data are available can involve the so-called GPS/levelling technique. Modelling of the GPS/levelling geoid undulations has usually been carried out using polynomial surface fitting, least-squares collocation (LSC) and finite-element methods. Artificial neural networks (ANNs) have
T. Kavzoglu, M. H. Saka
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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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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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On the Pratt and Airy models of isostatic geoid undulations

Journal of Geodynamics, 1998
Abstract Usually the topographic-isostatic geoid undulation is derived by a downward continuation of the external potential to the geoid. Unfortunately, such an approach merely yields a fictitious potential at the continental geoid within the topographic masses.
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Methods for the computation of geoid undulations from potential coefficients

Bulletin géodésique, 1971
The undulations of the geoid may be computed from spherical harmonic potential coefficients of the earth’s gravitational field. This paper examines three procedures that reflect various points of view on how this computation should be carried out. One method requires only the flattening of a reference ellipsoid to be defined while the other two methods
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