Abstract The orthometric height has an essential role in a variety of civil engineering projects and it is defined as the length curved plumbline from point (on earth surface) to its intersection with geoid surface. Leveling process considered most accurate technique for obtaining these heights. However, regardless potentials, tedious, costly, time consuming. Recently many organizations researc...

The geoid-to-quasigeoid correction has been traditionally computed approximately as a function of the planar Bouguer gravity anomaly and the topographic height. Recent numerical studies based on newly developed theoretical models, however, indicate that the computation of this correction using the approximate formula yields large errors especially in mountainous regions with computation points ...

Sparse and non-availability of high resolution geophysical data hindered the delineation of accurate morphology, structural configuration, tectonism and spreading history of Carlsberg Ridge (CR) and Central Indian Ridges (CIR) in the Indian Ocean between Owen fracture zone at about 10N, and the Rodriguez Triple Junction at ~25S. Analysis of available multibeam bathymetry, magnetic, gravity, sea...

[1] The Mid-Atlantic Ridge around the Fifteen-Twenty Fracture Zone is unique in that outcrops of lower crust and mantle rocks are extensive on both flanks of the axial valley walls over an unusually long distance along-axis, indicating a high ratio of tectonic to magmatic extension. On the basis of newly collected multibeam bathymetry, magnetic, and gravity data, we investigate crustal evolutio...

[1] We simulate jumps of ocean spreading centers with axial high topography using elastoplastic thin plate flexure models. Processes considered include ridge abandonment, the breaking of a stressed plate on the ridge flank, and renewed spreading at the site of this break. We compare model results to topography at the East Pacific Rise between 15 250N and 16 N, where there is strong evidence of ...

THE existence of a negative gravity anomaly of amplitude about 20 mgal below northern Skye was first pointed out by Tuson1, who interpreted it as being due to a sedimentary basin bounded at its NE margin by a large NW-SE fault. Our recent geophysical work confirms the existence of this basin, defines its margins more accurately, and provides evidence for the age of the infilling. Fig. 1 shows t...

[1] We show that the two-dimensional coherence between topography and Bouguer gravity is anisotropic throughout most of the Canadian Shield, excepted Hudson Bay Basin. We interpret the axis of maximum coherence as the direction where the lithosphere is weakest. In the southeastern Shield and the Appalachians, the azimuthally averaged coherence cannot be fitted by the thin elastic plate model. I...