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METHODE DE CALCUL DE LA DERIVEE SECONDE VERTICALE DU CHAMP GRAVIFIQUE OU DU CHAMP MAGNETIQUE UTILISANT ĽINTERVALLE DES ISOGAMMES *
Author(s) -
NGOC PHAM
Publication year - 1965
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1965.tb01949.x
Subject(s) - logarithm , cartesian coordinate system , physics , gravitational field , geodesy , derivative (finance) , constant (computer programming) , geology , geometry , mathematical analysis , mathematics , classical mechanics , computer science , financial economics , economics , programming language
This new method of calculation, of the second vertical derivative of gravity or magnetic fields is appreciably different from the classical methods because it is based upon the variations of the distance between the isogams rather than a regular grid with “constant spacing”. In a certain way, it is a method of “constant interval”. A number of practical advantages are inherent to the method, among these, the possibility to use the cartesian charts with bi‐logarithmic scales which make the calculation much easier, and the creating of iso‐error maps which are indispensable for the interpretation of the derivative maps. Three examples of practical application are given, two of them pertain to gravimetry, the third to aeromagnetism. These results are compared with second derivative maps obtained with other methods.