. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography y!900 1800 â I600 MILES Figure 25. Profile made by a Graf-Askania shipborne gravi- meter across a trough-shaped depression in the ocean bottom (shaded). The difference between the earth's gravity field (dashed line) and the observed value of gravity (solid line) is the free-air anomaly which closely corresponds to the shape of the ocean bottom (From Talwani, 1964, fig. 1). The slope of the zero free-air anomaly reflects the change of gravity with la
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography y!900 1800 â I600 MILES Figure 25. Profile made by a Graf-Askania shipborne gravi- meter across a trough-shaped depression in the ocean bottom (shaded). The difference between the earth's gravity field (dashed line) and the observed value of gravity (solid line) is the free-air anomaly which closely corresponds to the shape of the ocean bottom (From Talwani, 1964, fig. 1). The slope of the zero free-air anomaly reflects the change of gravity with latitude and the step at B is caused by a change of Eotvos correction due to change in the heading of the ship. because any gravitational field observed at the surface can be caused by an infinite number of different mass distributions, although every con- figuration of masses gives rise to a unique gravitational field (fig. 27). Gravity can only be interpreted if the number of possible solu- tions can be constrained by information on the size and depth of source materials obtained from seismic methods (fig. 16). ^.5 Electrical Methods Electrical methods utilize natural electric fields flowing through the earth (self-potential and telluric), applied direct-current fields (resistivity and equipotential), and applied alternating fields (induced. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atlantic Oceanographic and Meteorological Laboratories; Pacific Oceanographic Laboratories; United States. Environmental Science Services Administration. Research Laboratories; Environmental Research Laboratories (U. S. ). Washington, D. C. : U. S. Dept. of Commerce, Environmental Science Services Administration, Research Laboratories : For sale by Supt. of Docs. U. S. G. P. O.
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