How did the East African Rift System form Ethiopia's Rift Valley?

The Rift Valley in Ethiopia is a prominent segment of the East African Rift System, formed through complex tectonic processes that have shaped the country's landscape.12

At its core, the valley is a massive graben—a tectonic trough created when a block of the Earth's crust drops down between diverging lithospheric plates. This process is often associated with the upwelling of hot material from the underlying asthenosphere, which pushes the lithosphere upward and heats it, causing it to expand and stretch. This stretching manifests as the formation of the rift valley.12

In Ethiopia, this geological activity has resulted in a spectacular depression that runs through the center of the country, hemmed in by the escarpments of the Western and Eastern Highlands. The region is frequently associated with extensive volcanism, as the thinning of the crust allows molten material to rise to the surface. This has created a diverse topography, ranging from the low-lying, volcanic-rich Denakil Plain in the northeast to the higher-elevation lakes region in the southwest.21