Structures and Kinematics of the Eastern Margin of Central Main Ethiopian Rift

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Date

2016-06

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Addis Ababa Universty

Abstract

This study presents the kinematics and the tectonics of the eastern margin of central Main Ethiopian rift based on detail structural field investigation. Field mapping and structural analysis from thirteen at high angle (~ 60°) normal fault blocks across the eastern margin with a total of 28 fault slip data are collected and analyzed. All kinematic indicators show a dip slip movement with rake values close to 90°. The kinematic analysis yields a minimum horizontal compressive stress oriented in N120°E. This extension direction is almost similar to independent structural analysis and earthquake focal mechanism inversions. This hints that the central MER is characterized by a constant extensional tectonics during at least Quaternary.

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Keywords

kinematics and the tectonics

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