Other
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..71..290m&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 71, no. 2, Dec. 1984, p. 290-296.
Other
5
Geomagnetism, Heat Transmission, Magnetic Anomalies, Magnetic Field Inversions, Magsat Satellites, Curie Temperature, Magnetic Dipoles, United States, Wavelengths
Scientific paper
Long-wavelength anomalies in the total magnetic field measured by Magsat over the United States and adjacent areas are inverted to an equivalent surface layer magnetization distribution. The model is based on an equal-area dipole grid at the earth's surface. Model resolution, defined as the closest dipole spacing giving a solution having physical significance, is about 220 km for Magsat data in the elevation range 300-550 km. The magnetization contours correlate well with large-scale tectonic provinces. A higher-resolution (200 km) model based on relatively noise-free synthetic 'pseudodata' is also presented. An excellent inverse correlation between apparent magnetization and heat flow in the western U.S. is demonstrated. A new regional heat flow map derived indirectly from Magsat data shows nearly all the important thermal anomalies evidenced in previous published maps. Notably, the map predicts high heat flow in Nebraska and the Dakotas, suggesting the presence of a 'blind' geothermal area of regional extent.
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