Recent Earthquake in Ethiopian Rift Valley: A Cause for Concern?

In a significant development, a 4.5 magnitude earthquake struck the Ethiopian Rift Valley on Thursday at 6:28 PM Cairo time. Located 150 km east of Addis Ababa and 600 km from the Grand Ethiopian Renaissance Dam (GERD), the quake comes on the heels of two previous tremors in the same area this week.

The Recent Seismic Activity

According to Abbas Sharaqi, a professor of geology and water resources, this latest earthquake occurred on December 26, 2024. It follows a magnitude 4.4 quake on December 21 and a 4.6 magnitude event on December 23, all in the same region. These earthquakes highlight increasing seismic activity in Ethiopia and its surroundings.

Historical Context of Earthquakes in Ethiopia

Sharaqi provided a broader context noting that 41 earthquakes with magnitudes of 4 or greater have been recorded in Ethiopia and nearby areas this year. The most significant of these was a 5.2 magnitude earthquake on October 6. This marks the highest number of such tremors in the last ten years. Prior to the commencement of filling the GERD in 2020, the average annual earthquake count was around five. In 2023, this number rose to 38.

The Impact of the Grand Ethiopian Renaissance Dam (GERD)

The ongoing filling of the GERD plays a crucial role in this seismic activity. The dam currently holds 60 billion cubic meters of water, equivalent to 60 billion tons. This massive weight is exerting significant pressure on the geologically sensitive area of the African Rift Valley, which divides Ethiopia in half and is prone to earthquakes and volcanic activity.

Sharaqi emphasized that while the recent earthquakes have a weak to moderate impact on the GERD due to their distance and magnitude, the situation could change. A more powerful earthquake closer to the dam could pose a serious threat. In May 2023, a 4.4 magnitude tremor occurred just 100 km away, though it posed no immediate danger.

Future Risks to the GERD

The recurrence of stronger earthquakes closer to the dam could compromise its structural integrity, especially once it is fully filled. The dam, under such conditions, could become a potential “explosive water bomb.” While this does not imply an imminent failure, the risk of damage increases significantly during the flood season, which typically runs from July to September.

Conclusion: Monitoring Seismic Activity is Crucial

The recent seismic activity in the Ethiopian Rift Valley underscores the ongoing risks associated with the GERD. Continuous monitoring and preparedness strategies are essential to mitigate potential hazards. As Ethiopia continues to manage the economic and social benefits of the dam, addressing these geological challenges remains a critical priority.