. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography polarization and induction), to locate small scale features such as electrically conductive ore bodies. Voltages due either to natural or artificial electrical currents flowing through the earth are measured between two electrodes inserted in the ocean bottom. Differences in electrical response between pairs of electrodes evidence differences in the resistivity of the intervening rocks. Electrical methods are com- monly used on land and their applic
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography polarization and induction), to locate small scale features such as electrically conductive ore bodies. Voltages due either to natural or artificial electrical currents flowing through the earth are measured between two electrodes inserted in the ocean bottom. Differences in electrical response between pairs of electrodes evidence differences in the resistivity of the intervening rocks. Electrical methods are com- monly used on land and their application to the ocean bottom is presently in the stage of research and development. The self-potential method involves placing electrodes into the ocean bottom and measuring naturally occurring anomalous potentials be- tween them with a mi 11ivoltmeter or potentiometer. Anomalously high potentials result from electric currents flowing through sulfide and graphite ore bodies caused by associated naturally occurring electro- chemical reactions. Self-potential anomalies have been observed associated with sulfide ore bodies beneath the continental shelf (Corwin et al., 1970).. LIMIT OF PIUMIAN SALT GRAVITY . LOW £^) 100 }00 KIlOMETKfS Figure 26. Gravity "lows" on a gravity map of the North Sea are associated with salt domes of lower density than sur- rounding materials (From Smith, 1968, fig. 6). 790. 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 Do
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