Residual Terrain Model Effect And Gravimetric Terrain Correction For Gravity Field Modeling Over Ethiopia

In this study, residual terrain model effects and terrain corrections were computed at 1.5 arcminuterngridrnnodesrnandrnterrestrialrngravityrnstationsrnandrnpresentedrninrngridrnmapsrnhavingrn1.5rnarcrnminuternrnspatialrnrnresolutions over Ethiopia. 30 arc second SRTM DEM was used in the construction ofrnResidual Terrain Model elevation of d/o 200 and 2190. A smooth surface was observed in thernmean elevation surface corresponding to ~100km spatial scale. The mean elevation surfacerncomputed from the low pass filter was adopted because it shows better spectral details than therntopography spherical harmonic methods. The computations were made with an integration radiusrnof 20km and 200km for inner and outer zones respectively. In Ethiopia, 92.12% of RTM directrneffects corresponding to d/o 200 reaches 25mgal and 85.74% of RTM indirect effects are less thanrn30cm. 98.85% of terrain corrections are less than 15mgal. For reference surface corresponding torn~9km spatial scale, 97.52% of the RTM direct effects are less than 25mgal. 98.26% of indirectrneffects are less than 5cm. the RTM effects and terrain corrections computed with mean elevationrnsurface corresponding to ~9km spatial scale are not significant. The result of the study can bernapplicable for accurately interpretation of geoscientific studies.

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