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地球与行星物理

ISSN  2096-3955

CN  10-1502/P

Citation: Fidèle Koumetio, Donatien Njomo, Constant Tatchum Noutchogwe, Eric Ndoh Ndikum, Sévérin Nguiya, Alain-Pierre Kamga Tokam, 2019: Choice of suitable regional and residual gravity maps, the case of the South-West Cameroon zone, Earth and Planetary Physics. doi: 10.26464/epp2019004

doi: 10.26464/epp2019004

SOLID EARTH: GEODESY AND GRAVITY

Choice of suitable regional and residual gravity maps, the case of the South-West Cameroon zone

1. 

Department of Physics, Faculty of Science, University of Dschang, PO Box 67 Dschang, Cameroon

2. 

Department of Physics, Faculty of Science, University of Yaounde I, Cameroon

3. 

Department of Physics, ENS Bambili, University of Bamenda, Cameroon

4. 

Department of Fundamental Sciences, H.T.T.T.C. Bambili-Bamenda, University of Bamenda, Cameroon

5. 

Department of Physics, Faculty of Genial Engineering, University of Douala, Cameroon

Corresponding author: Fidèle Koumetio, koumetiof@yahoo.fr fidele.koumetio@univ-dschang.org

Received Date: 2018-08-07
Web Publishing Date: 2019-12-01

The quantitative interpretation of gravity anomalies due to shallow structures needs separation between long wavelength anomalies (regional anomalies) and short wavelength anomalies (residual anomalies). The regional-residual field separation can be carried out using the polynomial method. In this case, the so-called regional field of order n is treated as a polynomial of degree n. The present study shows that the degree n must vary between a smallest value nmin and a maximum value nmax. This article presents a method to process gravity data that allows determination of nmin and nmax for a given study area. We apply the method to gravity data of the South-West Cameroon zone. In this chosen study area, we find that regional anomaly maps of orders ranging from 1 to 9 and residual anomaly maps of orders ranging from 1 to 8 can be used for suitable interpretation. The analyses show that one may need residual anomaly maps of several orders to perform satisfactory quantitative interpretation of the different intrusive bodies found in a given area.

Key words: gravity, regional anomaly, residual anomaly, upward continuation, correlation factors, intrusive body

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Choice of suitable regional and residual gravity maps, the case of the South-West Cameroon zone

Fidèle Koumetio, Donatien Njomo, Constant Tatchum Noutchogwe, Eric Ndoh Ndikum, Sévérin Nguiya, Alain-Pierre Kamga Tokam