In 1990, present day South Sudan was rocked by a series of violent earthquakes.

It started with the largest event (Mw 7.2), and continued with multiple very large aftershocks for the next couple of months.

[7] The Aswa Rift Zone (ARZ) is an important geologic structure in the area near the earthquakes.

The ARZ may act as a broad zone of faulting that links together the eastern and western portions of the EARS.

[i] Its focal mechanism shows left-lateral (sinistral) strike-slip faulting, which is consistent with the shear forces in the area of the ARZ.

[17] The earthquake killed 31 people and damaged some buildings in Juba, and some in Moyo, Uganda.

This event was a mb  6.6, Ms  7.0, Mw  7.1 earthquake that occurred at a depth of 10–40 km (6.2–24.9 mi).

[21] It caused additional structural damage to buildings previously affected by the first and strongest shock, however, no casualties occurred.