. The Earth beneath the sea : History . Range in miles Fig. 6. Composite travel-time plot of Atlantis-Caryn Stations of 15, 16 March, 1949. Layer 2 velocity (estimated) = km/sec; Layer 3 velocity = km/sec; Layer 4 velocity = km/sec. (After Hersey et al., 1952.) profiles to penetrate to the Mohorovicic discontinuity (Hersey et al., 1952), Layer 2 was not observed directly but its presence was inferred from sub- bottom echoes, and its thickness was calculated using a velocity of km/sec determined by Officer et al. (1952). Thicknesses using this assumption and the intercepts o
. The Earth beneath the sea : History . Range in miles Fig. 6. Composite travel-time plot of Atlantis-Caryn Stations of 15, 16 March, 1949. Layer 2 velocity (estimated) = km/sec; Layer 3 velocity = km/sec; Layer 4 velocity = km/sec. (After Hersey et al., 1952.) profiles to penetrate to the Mohorovicic discontinuity (Hersey et al., 1952), Layer 2 was not observed directly but its presence was inferred from sub- bottom echoes, and its thickness was calculated using a velocity of km/sec determined by Officer et al. (1952). Thicknesses using this assumption and the intercepts of Layers 3 and 4 are: Layer 1 = km; Layer 2 = km; Layer 3 = km. Fig. 7 is an example of a Pacific station in the region between the Hawaiian Islands and the coast of North America (Raitt, 1956). Three layers were observed. The second layer has the characteristic high velocity of the region. Because of this comparatively small velocity contrast with Layer 3 and the
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
