. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 285 is A l\ °Free-Air Arte vnoly 947 â KSZ 4(1- \ USS Task, I nVening Mel n. 1 U "*V.^ / -40- \ ^**x _ -x DC ;-^" - sea level. Fig. 2. Section across the continental shelf, slope and rise off Cape Hatteras (from Worzel and Shurbet, 1955, fig. 8). Distance in kilometers from ESSO Hatteras Light Well No. 1. A. Computed and observed gravity anomalies. B. Structure deduced from seismic and gravity evidence. figs. 20â22).
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 285 is A l\ °Free-Air Arte vnoly 947 â KSZ 4(1- \ USS Task, I nVening Mel n. 1 U "*V.^ / -40- \ ^**x _ -x DC ;-^" - sea level. Fig. 2. Section across the continental shelf, slope and rise off Cape Hatteras (from Worzel and Shurbet, 1955, fig. 8). Distance in kilometers from ESSO Hatteras Light Well No. 1. A. Computed and observed gravity anomalies. B. Structure deduced from seismic and gravity evidence. figs. 20â22). The continental margin of southeastern North America appears to deviate only slightly from isostatic equilibrium, although the density dis- tribution is inadequately known to compute accurate models. The maximum isostatic adjustments have apparently taken place beneath the seaward edge of the continental slope where a negative gravity anomaly, generally amounting to several tens of milligals, tends to occur (Fig. 2). The continental drift separation of North America and Africa, presumably resulting from growth of the intervening ocean basin by sea-floor spreading, implies that the continental crust is horizontally coupled to the oceanic crust. The degree of vertical coupling between the continental margin and the ocean basin is more difficult to assess. From recent analogies and model experiments, it is inferred that systems of down-to-ocean basin normal faults developed on the two continental margins at times of rifting. The Red Sea, a part of the world rift system, is interpreted as a Recent example of an early stage of continental rifting illustrating down-to-basin normal faulting with accompanying tilting of fault blocks developed in response to crustal tension (Drake and Girdler, 1964, figs. 4, 14; Lowell and Genick, 1972, figs. 3, 5). Clay blocks subjected to tensional stress in model experiments develop a central graben bounded by normal faults (Cloos, H., 1930; Clo
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