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Bouguer Images of the North American CratonProcessing of existing gravity and aeromagnetic data with modern methods is providing new insights into crustal and mantle structures for large parts of the United States and Canada. More than three-quarters of a million ground station readings of gravity are now available for this region. These data offer a wealth of information on crustal and mantle structures when reduced and displayed as Bouguer anomalies, where lateral variations are controlled by the size, shape and densities of underlying materials. Digital image processing techniques were used to generate Bouguer images that display more of the granularity inherent in the data as compared with existing contour maps. A dominant NW-SE linear trend of highs and lows can be seen extending from South Dakota, through Nebaska, and into Missouri. This trend is probably related to features created during an early and perhaps initial episode of crustal assembly by collisional processes. The younger granitic materials are probably a thin cover over an older crust.
Document ID
19850015337
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Arvidson, R. E.
(McDonnell Automation Co. Saint Louis, MO, United States)
Bindschadler, D.
(McDonnell Automation Co. Saint Louis, MO, United States)
Bowring, S.
(McDonnell Automation Co. Saint Louis, MO, United States)
Eddy, M.
(McDonnell Automation Co. Saint Louis, MO, United States)
Guinness, E.
(McDonnell Automation Co. Saint Louis, MO, United States)
Leff, C.
(McDonnell Automation Co. Saint Louis, MO, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1985
Publication Information
Publication: NASA, Washington Repts. of Planetary Geo. and Geophys. Program, 1984
Subject Category
Geophysics
Accession Number
85N23648
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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