. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 392 HEEZEN AND EWING 40° 20° 0» [chap. 16. A I E HI Continental margin Continentol shelf Marginal plateau Continental slope and marginal escarpment Marginal trencti Continental rise Outer ridge a Ocean-basin floor Abyssal floor Abyssal plain \,£P \ Abyssal tiills pT^ Oceanic rise i^ = =1 E53 C Mid- ocean ridge Crest Rift valley ond ^^ rift mountains '-^^ Flanks fcr^ Fracture zone Fig. 4. A generalized province map of the South Atlantic showing the threefold division of the ocean into continental margin, ocean-basin floor a
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 392 HEEZEN AND EWING 40° 20° 0» [chap. 16. A I E HI Continental margin Continentol shelf Marginal plateau Continental slope and marginal escarpment Marginal trencti Continental rise Outer ridge a Ocean-basin floor Abyssal floor Abyssal plain \,£P \ Abyssal tiills pT^ Oceanic rise i^ = =1 E53 C Mid- ocean ridge Crest Rift valley ond ^^ rift mountains '-^^ Flanks fcr^ Fracture zone Fig. 4. A generalized province map of the South Atlantic showing the threefold division of the ocean into continental margin, ocean-basin floor and mid-oceanic ridge. In the equatorial Atlantic a series of left slip faults or fracture zones has offset the mid-oceanic ridge westward for over 2000 miles. Although fracture zones have been known since 1939 in the Pacific (Menard, 1955), this is the first time that they have been mapped in the Atlantic. (After Heezen and Tharp, 1961.) epicenter belt actually coincides with the rift valley. The data available would, however, allow the conclusion that the rift mountains also lie within the seismic belt. All epicenters of the mid-oceanic belt are of shallow-focus. This distin- guishes the mid-oceanic l)elt from the circum-Pacitic epicenter belt. The. 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 Hill, M. N. (Maurice Neville), 1919-. New York : Interscience Pub.
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