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Magnetic Surveys of the Continental Shelves
Recent Investigations on the Continental Margin
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aeromagnetic Alaska Peninsula Aleutian Trench alkali Amer America andesite anomaly bands Arctic Atlantic axis basalt basalt magma basement belt beneath Bull Bunce California coast coastal continental margins continental shelf continental slope continents convection Cretaceous crust crustal structure deep deformation depth earth earthquake East Pacific Rise eastern Eocene eugeosynclinal Ewing faults Figure free-air Geological Survey Geophys geophysical gravity anomaly Gulf Hawaiian heat flow Heezen Hersey high-alumina basalt indicate investigations island arcs Japan kilometres km/sec Lamont Geological Observatory layer magma magnetic anomalies margins and island metres mgal mid-ocean ridges northern observed ocean basins ocean floor Oceanographic olivine Ontario Ottawa outer ridge pattern Prof Puerto Rico Trench region rift Scotia sedimentary sediments seismic refraction shallow stations studies submarine suggested surface Talwani tectonic temperature Tertiary tholeiite U.S. Geol upper mantle variation velocity volcanic rocks western Worzel