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《Chinese Journal of Sinica》 1977-01
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INVERSION OF GRAVITY DATA BY USE OF A METHOD OF“COMPRESSED MASS PLANE" TO ESTIMATE CRUSTAL STRUCTURE

LIU YUAN-LUNG WANG CHIEN-SHEN(Institute of Geophysics, Aoademia Sinica)  
This paper presents a method called the "Compressed Mass Plane" to approximate, a two-dimensional geological body. At first, the data of a gravity data is inversed, using matrix analysis to get the surface density of each element of the compressed mass plane. Then, from the relation between surface density and mass density of each element, the thickness of each two-dimensinal element can be calculated and the approximate thickness of the crust tentatively obtained. Further improvements of the estimation of the crustal thickness can be made by direct gravity computation of the crustal model thus obtained and repeated adjustments of the results in order to minimize the difference between computed and observed gravity anomalies. In that way, it may be possible to get the better depths of the lower boundary of the crust.Based on the assumed values of contrast between the "Basaltic", the "Granitic" layers and the Upper Mantle and also the above calculated crustal thickness, it is again possible to calculate the gravity anomalies coming from the undulations of the Mohorovicic and (Conrad interfaces respectively. By the same way, the inversion of the gravity anomaly of the Conrad interface, a comparatively correct position of this interface can be obtained.To test this method of gravity inversion, three hypothetic crustal models and an observed gravity profile are introduced here as examples. In comparing with other methods of determining crustal interfaces, the results of the present method of compressed mass plane seem to be better.
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