. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. SKCT. 1] THE CRXJSTAL ROCKS 87 laboratories. There are large areas in which there are no observations. For example, there are no published data on the Arctic Ocean and the South Atlantic, and there are only five stations in the Indian Ocean concentrated in a small region near the equator. Present results certainly cannot be regarded as an adequate sample of all oceans. There is still the possibility that some of the areas not yet investigated will differ significantly from the average of those already studied. This is a co
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. SKCT. 1] THE CRXJSTAL ROCKS 87 laboratories. There are large areas in which there are no observations. For example, there are no published data on the Arctic Ocean and the South Atlantic, and there are only five stations in the Indian Ocean concentrated in a small region near the equator. Present results certainly cannot be regarded as an adequate sample of all oceans. There is still the possibility that some of the areas not yet investigated will differ significantly from the average of those already studied. This is a continuing study, and exploration of many of the open areas is being planned or is in progress. As new data become available, modification of our present ideas about oceanic structure is expected. Atlantis-Caryn refraction station 35 August 22, 1950. ^°^y" 35A SW ^^^ 10 15 20 25 Direct water wove travel time (sec) Atlantis Fig. 4. Travel-time plot of Atlantis-Caryn Station 35, southeast of Bermuda. Layer 2 velocity = km/sec; Layer 3 velocity = km/sec; Layer 4 velocity = km/sec. (After Officer, Ewing and Wuenschel, 1952.) Seismic-refraction observations of the oceanic crust have been obtained by investigations at a relatively small number of laboratories. In the United States work has been done by Woods Hole Oceanographic Institution, Lamont Geological Observatory and Scripps Institution of Oceanography; in England by the Department of Geodesy and Geophysics of the University of Cambridge; and in the by the Institute of Geophysics and the Institute of Oceanology. Examples of travel-time plots taken from published work of these labora- tories are illustrated in Figs. 2-8. Fig. 2 represents a radio-sonobuoy station of. 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. (Maur
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