Measurements of the geomagnetic field can be used to help determine the structure of the Earth, since rocks often contain magnetic minerals. Measurements of the strength of the Earth's gravitational field can also be used, since the more dense the rocks, the stronger the field. The interpretation of large amounts of data can be aided by "automatic" interpretation techniques such as Euler deconvolution. This considers the anomalies to be caused by many relatively simple sources (such as dipoles or lines of dipoles) and produces the positions and depths of these sources. This data can then be used as a basis for a more detailed interpretation. The software runs under DOS and is available free via ftp from ftp.cs.wits.ac.za in directory/pub/general/geophys. (C) 1998 Elsevier Science Ltd. All rights reserved References: 12
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