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Refinement of Bouguer anomalies derived from the EGM2008 model,impact on gravimetric signatures in mountainous region:Case of Cameroon Volcanic Line,Central Africa

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Earth and Planetary Physics 2020年第6期4卷 639-650页

作者： Paul Gautier Kamto Cyrille Mezoue Adiang severin nguiya Joseph Kamguia Loudi Yap Geodesy Research Laboratory National Institute of Cartography(NIC)YaoundeCameroon Department of Physics Faculty of ScienceUniversity of Yaounde ICameroon Laboratory E3M Faculty of Industrial EngineeringUniversity of DoualaCameroon Department of Physics Faculty of ScienceUniversity of DoualaCameroon

Global geopotential models have not included the very high frequencies of the Earth’s external gravity *** is called omission *** omission error becomes more important in mountainous areas(areas with highly variable topography).The work reported here consists in reducing the omission error in measurements of Bouguer gravity anomalies,by refining the global geopotential model EGM2008 using the spectral enhancement *** method consists in computing the residual terrain effects and then coupling them to the gravimetric signal of the global geopotential *** compute the residual terrain effects,we used the Residual Terrain Model(RTM)*** refine it required a reference surface(ETOPO1)developed up to degree 2190(the maximum degree of the EGM2008 model)and a detailed elevation model(AW3D30).Computation was performed with the TC program of the GRAVSOFT *** topography of the study area was assumed to have a constant density of 2670 kg/*** the inner and outer zones,the respective integration radii of 10 km and 200 km have been *** obtained very important RTM values ranging from−53.59 to 34.79 *** values were added to the gravity anomalies grid of the EGM2008 model to improve accuracy at high *** a part of the Cameroon Volcanic Line and its surroundings(mountainous area),we made a comparison between the residual Bouguer anomalies before and after *** report differences ranging from−37.40 to 26.40 *** conclude that the impact of omission error on gravimetric signatures is observed especially in areas with high variable topography,such as on the Cameroon Volcanic Line and around the localities of Takamanda,Essu,Dumbo,and *** finding illustrates the great influence that topography has on accurate measurement of these gravity anomalies,and thus why topography must be taken into *** can conclude that in preparing a global geopotential model,a high resolution DTM must be used to decrease

关键词： residual Terrain Model EGM2008 Omission error refined Bouguer anomalies mountainous area

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Crustal structure beneath Cameroon from EGM2008

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Geodesy and Geodynamics 2014年第1期5卷 1-10页

作者： Ngatchou Heutchi Evariste Liu Genyou Tabod Charles Tabod Kamguia Joseph nguiya severin Tiedeu Alain KE Xiaoping State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and GeophysicsChinese Academy of Sciences Department of Physics Faculty of ScienceUniversity of Yaoundé I National Institute of Cartography Industrial Engineering Faculty University of Douala Ecole Nationale Supérieure Polytechnique Université de Yaoundé I

We used the Earth Gravitational Model （EGM2008） data sets to analyze the regional gravity anoma- lies and to study the underground structures in Cameroon. We first created a high-resolution Free-Air anomaly database, then corrected the gravity field of the topographic effect by using ETOPO1 DEM with a resolution of 0.01~ to obtain the Bouguer anomaly, then applied a multi-scale wavelet-analysis technique to separate the gravity-field components into different parts of shallow-to-deep origins, and finally used the logarithmic power spectrum technique to obtain detailed images and corresponding source depths as well as certain lateral inho- mogeneity of structure density. The anomalies of shallow origin show successive elongated gravity ＂highs＂ and ＂lows＂ attributable to subsurface Tertiary and lower Cretaceous undulations. Our results are in good agreement with previous investigations.

关键词： Cameroon EGM2008 gravity anomalies wavelet transform power spectrum crustal structure

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