Gravity Studies of Erta-Ale Volcanic Range, Afar
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Date
2009-07
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Addis Ababa Universty
Abstract
An analysis of gravity data collected by the institute of Geological Survey of Ethiopia in
conjunction with seismic wave velocity and Euler Deconvolution results to determine a
preliminary crustal structure model of study area. The residual gravity anomaly indicates gravity
maxima occur over magmatic segments and the gravity minima occur over the Ethiopian plateau
escarpment and Danakil block which is related to low density material beneath the area. Gravity
modeling using seismic wave velocity and Euler Deconvolution as a constraint indicates that the
crust thins nearly 14.4Km over the study area. The presence of a thinned crust and higher density
lower crust is characteristic of volcanic rifted margins. The study shows that the occurrence of
geological structures, that are found the Ethiopian plateau escarpment, Erta Ale and Tat Ale
volcanic range these structures are inferred from the high gradient residual gravity anomaly. In
addition a significant thickness of sedimentary rock is observed in the beneath the study area.
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Keywords
Erta-Ale Volcanic Range