Magnetic anomalies are due to variations in the Earth's magnetic field caused
by the uneven distribution of magnetic minerals (primarily magnetite)
in the rocks that make up the upper part of the Earth's crust. The features
and patterns of the magnetic anomalies can be used to delineate details
of subsurface geology, including the locations of buried faults and magnetite-bearing
rocks and the depth to the base of sedimentary basins. This information
is valuable for mineral exploration, geologic mapping, and environmental
studies.
The Missouri magnetic map is constructed from grids that combine information
collected in 25 separate magnetic surveys conducted between 1943 and
1987. The data from these surveys are of varying quality. The design
and specifications (terrain clearance, sampling rates, line spacing,
and reduction procedures) varied from survey to survey depending on the
purpose of the project and the technology of that time. Every attempt
was made to acquire the data in digital form.
Version 1.0
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| Posted August 2005 |
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For more information about this report contact: Bob
Kucks
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