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geoid

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Journal Article
Journal: The Leading Edge
Published: 01 February 2020
The Leading Edge (2020) 39 (2): 135–143.
... of the gravity data to a consistent system, which refers to unified coordinates, base station, and vertical datum, is essential in geophysics and geodesy, especially in geoid determination. A new standardized and unified data format is computed and proposed for the supply of gravity data for Ireland and Northern...
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Series: Geological Society, London, Special Publications
Published: 02 January 2020
DOI: 10.1144/SP487.13
EISBN: 9781786204721
... mechanics ( c. 1686), its spatial variations reflect both the shape of and distribution of mass within the Earth. Experience shows that fluids at rest in a gravity field naturally seek an equipotential configuration, free of shear stresses. As such, mean sea level – the geoid – serves as an intuitive...
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Journal Article
Journal: Geosphere
Published: 25 February 2018
Geosphere (2018) 14 (2): 684–709.
... analysis of geoid-to-elevation ratios suggests that, at present, topography of the Rio Grande rift region is compensated by a component of mantle-driven dynamic uplift. Previous work has indicated that this dynamic uplift is caused by focused vertical flow in the upper mantle resulting from slab descent...
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Journal Article
Published: 30 January 2018
Canadian Journal of Earth Sciences (2018) 55 (4): 397–405.
...Mehdi Goli; Ismael Foroughi; Pavel Novák This article discusses methods for selecting criteria used for stopping iterative regularization methods applied to solving continuation of gravity observed at or outside the Earth’s surface down to the geoid. This computational step is required...
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Series: GSA Special Papers
Published: 01 October 2015
DOI: 10.1130/2015.2514(13)
... We use the fact that geoid anomalies are directly related to the local dipole moment of the density-depth distribution to help constrain density variations within the lithosphere and the associated tectonic stresses. The main challenge with this approach is isolating the upper mantle geoid...
Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 October 2015
Lithosphere (2015) 7 (5): 503–510.
... that the oceanic part of the plate is very little deformed; thus, the ridge-push forces may be compensated by significant strain rates outside the oceanic parts of the plate. We used an elastic finite element analysis of geoid gradients of the upper mantle to evaluate stresses associated with the gravitational...
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Journal Article
Published: 09 June 2015
Canadian Journal of Earth Sciences (2015) 52 (10): 823–832.
...Ahmed Abdalla; Saad Mogren Abstract A gravimetric geoid model (SAGEO13) is computed for the Kingdom of Saudi Arabia using a rigorous stochastic computational method. The computational methodology is based on a combination of least-squares (LS) modification of Stokes’ formula and the additive...
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Journal Article
Published: 01 February 2015
Italian Journal of Geosciences (2015) 134 (1): 114–119.
...Raaed Mohamed Kamel Hassouna Abstract In this study, the logarithmic least-squares collocation technique was applied to model the geoid surface over Egypt, using the satellite only model GOSO03S as a reference field. Firstly, several combinations of the logarithmic covariance fitting parameters...
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Journal Article
Journal: GSA Bulletin
Published: 01 July 2013
GSA Bulletin (2013) 125 (7-8): 1027–1052.
... ( Fig. 1B ) ( Chappell, 1974 ). Accompanying both deformations is a deflection of the geoid ( Farrell and Clark, 1976 ), which is the gravitational equipotential surface upon which the sea surface rests. The resulting time-dependent deflections of the solid and sea surfaces, which occur everywhere...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 June 2013
Lithosphere (2013) 5 (3): 235–246.
... in the lithosphere. We show that it is possible to infer these local stress sources from the second spatial derivatives of a geoid height grid, used as a proxy of the GPE. The coherence of the method is validated on a passive margin, the Bay of Biscay. The result is that expected in such a geological configuration...
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Journal Article
Journal: AAPG Bulletin
Published: 01 November 2012
AAPG Bulletin (2012) 96 (11): 2037–2064.
... convection and accounts for the principal contributors to long-term sea level change: the evolving distribution of ocean floor age, dynamic topography in oceanic and continental regions, and the geoid. We infer the relative importance of dynamic versus other factors of sea level change, determine time...
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Series: GSA Special Papers
Published: 01 June 2011
DOI: 10.1130/2011.2478(12)
...), is consistent with regional thermal anomalies in the deep mantle, mapped by gravity of the geoid, seismic tomography, and paleomagnetic analysis. The Walvis Ridge and Rio Grande “hotspot tracks” are interpreted as stress response in the lithosphere during rifting. A plume-related heat source is not favored...
Journal Article
Journal: The Leading Edge
Published: 01 May 2010
The Leading Edge (2010) 29 (5): 540–545.
.... Comparisons with other older gravity fields show accuracy improvement of the order of 20–40% due to a combination of retracking, enhanced processing, and the use of the new EGM2008 geoid model. In coastal and polar regions, accuracy improved in many places by 40–50% (or more) compared with older global marine...
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Journal Article
Published: 30 April 2010
Canadian Journal of Earth Sciences (2010) 47 (4): 463–484.
...-related geophysical observables, such as the nonhydrostatic geoid, free-air gravity anomalies, and dynamic surface topography, and provide constraints on internal mantle density structure. The convection related observables are corrected for the isostatically compensated crustal heterogeneity and compared...
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Journal Article
Journal: Geology
Published: 01 February 2010
Geology (2010) 38 (2): 155–158.
... and upwelling above that is initially rooted at 1000–1500 km depth. Our models match topography and subsidence history anomalies, and are consistent with mantle seismic wave speed anomalies and the geoid. We suggest that when thermally driven slab downwelling ceased ca. 100 Ma, low-density material...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 December 2009
Lithosphere (2009) 1 (6): 358–363.
...C.G. Chase; A.J. Sussman; D.D. Coblentz Abstract Using geoid anomalies determined from satellite observations of the South American plate, we demonstrate the existence of a lithospheric flexural forebulge east of the High Andes. Using the planform and location of the geoid anomalies and accounting...
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Journal Article
Published: 03 July 2009
Canadian Journal of Earth Sciences (2009) 46 (5): 331–353.
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Journal Article
Published: 22 June 2009
Canadian Journal of Earth Sciences (2009) 46 (8): 571–585.
...Robert Kingdon; Petr Vaníček; Marcelo Santos Abstract In geoid computation, effects of real three-dimensional topographic masses on the Earth’s gravity field must be accurately quantified and, in the Stokes–Helmert scheme, replaced with effects of those masses condensed on the geoid. The most...
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Journal Article
Journal: Geosphere
Published: 01 October 2008
Geosphere (2008) 4 (5): 764–784.
... owing to the presence of this supporting swell, or epeirogen. The lithosphere beneath the epeirogen's summit is characterized by a coincident geoid anomaly, diminished seismic velocities in the upper mantle, and a north-trending, elevated Curie isothermal surface in the lower crust, all suggestive...
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Journal Article
Published: 01 May 2007
Russ. Geol. Geophys. (2007) 48 (5): 442–455.
...A.M. Petrishchevsky Abstract The study addresses the space distribution of lithospheric density contrasts in 3D and 2D surface (spherical) sources of gravity anomalies to depths of 120 km below the geoid surface and their relationship with shallow deformation and Archean, Early Paleozoic, and Late...
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