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Crustal interpretation of the Magsat data over the U.S

Crustal interpretation of the Magsat data over the U.S

SEG Abstracts 1982(1): 410-411

Magsat data have such inherent problems as long wavelength orbital drift and nonharmonic property in the residual total field. First, to correct for the long wavelength orbital drift while retaining short wavelength features, we removed a best-fit first-order trend for each path. In order to remove the effect of the altitude variation, and to adequately preserve broad scale anomalies, we next attempt to reduce the data on a common altitude by using a least-squares triple cosine series representation. To interpret these data by means of geologic geophysical terms, we devise a model which can account for vertical changes of magnetization in addition to lateral changes. Three-dimensional matrix of rectangular prisms is used to represent the variation of the magnetic susceptibility, which eventually vanishes at the Curie depth. Both of these new methods are verified to be effective for the simulated anomalies. The results from the actual data must be compatible with such surface data as Magnet U.S. aeromagnetic data or a crustal model based on the seismic profiles. The magnetic field measured at the satellite level consists of various contributions: the internal and external parts of the geomagnetic field, its secular variations, and the anomalous field caused by magnetized bodies in the crust of the earth. In order to study the crustal contribution of the field, we selected only those geomagnetically quiet time data (geomagnetic planetary index Kp less than 2+) and removed the reference field of MGST (6/80) (Langel et al., 1981).

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