. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 88 RAITT [chap. 6 the Cambridge University Department of Geodesy and Geophysics (Gaskell, Hill and Swallow, 1958). It illustrates a very clear-cut example of the second layer at a Pacific station which is more conspicuous than the average station because of the thin sediment, km, and the unusually thick Layer 2, km. Layer 3 is well observed, but penetration to Layer 4 was not achieved. 20n-r ['III' Profile 2; 1956 cruise M I I I I I I I I I I I I I i M { I I I I I 1 i I I I. I I I I I I I I I Beor N 10 15 20 25 30
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. 88 RAITT [chap. 6 the Cambridge University Department of Geodesy and Geophysics (Gaskell, Hill and Swallow, 1958). It illustrates a very clear-cut example of the second layer at a Pacific station which is more conspicuous than the average station because of the thin sediment, km, and the unusually thick Layer 2, km. Layer 3 is well observed, but penetration to Layer 4 was not achieved. 20n-r ['III' Profile 2; 1956 cruise M I I I I I I I I I I I I I i M { I I I I I 1 i I I I. I I I I I I I I I Beor N 10 15 20 25 30 Direct water wave time (sec) I ' I I I ^ I I I I I I I ill I I I J_i I I 35 40 45 Atlantis S 9 17,000 ^ 18,000 g- 19,000 Q "Atlantis 10,000 - - 20,000 Q. Q 30,000 40,000 10 20 —I \ r- 30 40 Distance (km) Ocean 177 5 96 693 50 —1 1 1 60 70 Q. Q 10 15 50,000'-- Fig. 5. Travel-time plot of Atlantifi Bear profile 2, 1956 cruise. Laj'er 2 velocity = km/sec; Layer 3 velocity = kin/sec; Layer 4 velocity = km/sec. (After Oflicer et al., 1959.) Fig. 3 represents another station of the Cambridge group, this one also taken by Challenger in the Atlantic. It also gives a good example of Layer 2 because of its fairly great thickness, km. The length of the Layer 3 segment is shorter than in Fig. 2 but long enough to give a good demonstration of the Layer 3 velocity, km/sec, and to determine the Layer 2 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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