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Estimation of the degree of polynomial fitted to gravity anomalies and its applicationNormal access

Author: Hualin Zeng
Journal name: Geophysical Prospecting
Issue: Vol 37, No 8, November 1989 pp. 959 - 973
DOI: 10.1111/j.1365-2478.1989.tb02242.x
Organisations: Wiley
Language: English
Info: Article, PDF ( 503Kb )

A method for estimating the degree of polynomial fitted to gravity anomalies to evaluate the regional anomaly is presented. The anomaly can be fitted by polynomials of different degrees with the least-squares method and the optimum degree of the polynomial evaluating this anomaly can be estimated from the point of discontinuity of the gradient on a graph of variance against the polynomial degree. The Bouguer gravity is initially separated by upward continuation to a proper height and then the degree of regional polynomial to fit the Bouguer anomaly can be estimated. Theoretical and field examples show the effectiveness of the method.

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