Magnetic anomalies over the continents and their analyses

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Abstract
It is significant that many countries of the world have undertaken aeromagnetic mapping programs to survey their nations in a reasonable period of time. The U.S.S.R., for example [Solov'yeva, 1968, 1971], had finished complete coverage by 1967 using a flight spacing of 2 km. The Canadian Geological Survey had initiated a program to map the entire Canadian Shield at a flight separation of 1/2 mi (804 m). Almost three fourths of the shield has now been flown, and the maps have been made available to the public [Hood, 1974]. Yet at this writing there is no national program to map the United States aeromagnetically. To date, published aeromagnetic maps are available for only 10% of the United States. Although at least half of the country has been adequately surveyed by private industry, the results have not been made available to the public. Most of the coverage in the United States has been provided by the U.S. Geological Survey, the funds often coming from other organizations, such as state geological surveys. For the past few years the U.S. Geological Survey has adopted a policy of promptly releasing aero‐magnetic data to the public via the open file route. These recent publications, mostly at a scale of 1:250,000, are cited in the bibliography at the end of this report.