. The Earth beneath the sea : History . Continental Margin Ocean Basin Floor Mid Oceanic Ridge Ocean Basin Floor Continental Margin Fig. 1. Major physiographic divisions of the North Atlantic and earthquake epicenters 1905-56. This threefold pattern of continental margin, ocean-basin floor, and mid- oceanic ridge in the North Atlantic has been found in the South Atlantic, Indian. South Pacific and Arctic Oceans. Epicenters from Gutenberg and Richter (1954) and the epicenter cards of the United States Coast and Geodetic Survey. Accuracy of epicenter location varies from ± |° to ± 1 J°. The majo

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. The Earth beneath the sea : History . Continental Margin Ocean Basin Floor Mid Oceanic Ridge Ocean Basin Floor Continental Margin Fig. 1. Major physiographic divisions of the North Atlantic and earthquake epicenters 1905-56. This threefold pattern of continental margin, ocean-basin floor, and mid- oceanic ridge in the North Atlantic has been found in the South Atlantic, Indian. South Pacific and Arctic Oceans. Epicenters from Gutenberg and Richter (1954) and the epicenter cards of the United States Coast and Geodetic Survey. Accuracy of epicenter location varies from ± |° to ± 1 J°. The major morphological divisions and the Mid-Atlantic rift valley are shown on the profile, which extends from North America to Africa. (Vertical exaggeration of profile is 40:1.)

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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom