By Sven-Erik Hjelt

Geophysical measurements usually are not performed for the sake of paintings simply. The ultimategoal is to resolve a few well-defined geological, tectonical or structural difficulties. For this function, the information must be interpreted, translated, right into a actual version of the subsurface. ... This ebook describes a few ofthe most vital universal positive aspects of alternative geophysical facts units. (fromthe advent) clients at universities but additionally practitioners in exploration, physics or environmental sciences, at any place sign processing is important, will make the most of this textbook.

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**Extra info for Pragmatic Inversion of Geophysical Data (Lecture Notes in Earth Sciences)**

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9. Interpretation of horizontal loop (Slingram) data by conducting halfplane scale model curves. 26. Squares measured real component data; circles measured imaginary component data; a = 40 m. Black regions borehole intersection of ore. 4 O N THE ACCURACY OF CHARACTERISTIC POINT INVERSION Depending on the choice of characteristic points and whether analytic expressions exist for the anomalous field produced by the model or not, the accuracy of characteristic point interpretation can be estimated to some extent.

Equivalence can be considered as a case of parameter coupling. When the conductivity and thickness of a layer varies within certain limits (their product remaining constant) no differences can be seen in the sounding curves within the accuracy of measurements. The classical example has been presented by Homilius (1970; Fig. 19), where the basic model contains a middle conducting layer with a conductance of 20 S. 2. and Fig. 19), then all sounding curves are within + 5% of the curve for the basic model.

FM, where k < 1 maximum slope of the anomaly minimum slope of the anomaly the slope of the anomaly i s F'kM = k . F M, where k < 1 etc. COMBINED MEASURES Any definitions are possible, a° 7a I \pl Xm X~/4 X~/2 XM ~ . Fm Fig. 1a. Definition of characteristic points and measures for magnetic interpre oration using the methods of Bruckshaw and Kunaratnam (left) and Moo (right) (redrawn from Am 1972), 37 b. F~M FII/2M~ FI1;2m F'm\ Fig. lb. Definition of characteristic points and measures for ma~gnetic interpretation using the methods of Grant and Martin (left) and Bean (right) (redrawn from Am 1972).