Abstracts
RESUME
Unc approche non classique de la mode'lisalion du champ gravimltrique regional est pre'sentee. Le concept mis de l'avant dans la m^thodede Griffin permettantd'extraireranomalier^siduelleestceluiquis'^Jparentele plus arapprocheproposeedans cet article. La tendance actuelle fait surtout appcl a des fonctions mathematiques et a l'analyse numerique. La m£diode proposce est compare avec d'autres techniques de representation de la regionale en prenant comme exemple la region du Mont Mejgantic. Les resultats suivants sont presented: (1) approximation du champ regional par tes polynomes du ler, 2ieme et 3ieme degr£, (2) approximation du champ regional par la m<5thode de la moyenne mobile suivant quelques versions de fenetre differentes, (3) correlations des parametres gravim£triques et lopographiques, (4) approximation des cartes de contour et des modelcs tridimensionnels pour chaque version calcul£e, (5) comparaison des r&ultats obtenus et choix me^thodologiques.
A non-classical approach towards regional, gravity-field modelling is presented, which is closest to the concept put forward within Griffin's method of isolating the residual anomaly. Current trends mainly call upon mathematical functions andnumerical analysis. The Mount Megantic area is used as an example to compare the proposed method with other techniques of representing the regional trend. Results are (1) approximation of the regional field with the help of linear, quadratic and cubic polynomials; (2) approximation of the regional field through the moving-average method using a few different windows; (3) correlation of gravity and terrain parameters; (4) approximation of contour maps and three-dimensional models for each calculated version; and (5) comparison of the results and methodological choices
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