Gravity Studies Of Erta-ale Volcanic Range Afar

An analysis of gravity data collected by the institute of Geological Survey of Ethiopia inrnconjunction with seismic wave velocity and Euler Deconvolution results to determine arnpreliminary crustal structure model of study area. The residual gravity anomaly indicates gravityrnmaxima occur over magmatic segments and the gravity minima occur over the Ethiopian plateaurnescarpment and Danakil block which is related to low density material beneath the area. Gravityrnmodeling using seismic wave velocity and Euler Deconvolution as a constraint indicates that therncrust thins nearly 14.4Km over the study area. The presence of a thinned crust and higher densityrnlower crust is characteristic of volcanic rifted margins. The study shows that the occurrence ofrngeological structures, that are found the Ethiopian plateau escarpment, Erta Ale and Tat Alernvolcanic range these structures are inferred from the high gradient residual gravity anomaly. Inrnaddition a significant thickness of sedimentary rock is observed in the beneath the study area.

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