The Aswa Dislocation, also called the Aswa mylonite belt, Aswa Lineament or Aswa Shear Zone is a north-west trending ductile shear zone that runs to the east of

Lake Victoria Lake Victoria is one of the African Great Lakes. With a surface area of approximately , Lake Victoria is Africa's largest lake by area, the world's largest tropical lake, and the world's second-largest fresh water lake by surface area after ...

in East Africa.

Extent

The lineament dates to the

Precambrian The Precambrian (or Pre-Cambrian, sometimes abbreviated pꞒ, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of the ...

era and thus is much older than the

East African Rift System East or Orient is one of the four cardinal directions or points of the compass. It is the opposite direction from west and is the direction from which the Sun rises on the Earth. Etymology As in other languages, the word is formed from the f ...

. It probably extends northwest to

Darfur Darfur ( ; ar, دار فور, Dār Fūr, lit=Realm of the Fur) is a region of western Sudan. ''Dār'' is an Arabic word meaning "home f – the region was named Dardaju ( ar, دار داجو, Dār Dājū, links=no) while ruled by the Daju, ...

in Sudan, perhaps along the

Abu Gabra Rift Abu or ABU may refer to: Places * Abu (volcano), a volcano on the island of Honshū in Japan * Abu, Yamaguchi, a town in Japan * Ahmadu Bello University, a university located in Zaria, Nigeria * Atlantic Baptist University, a Christian university ...

, and perhaps southeast to the Lindi fault zone on the Indian Ocean coast, passing through the Kilimanjaro and

Elgon Mount Elgon is an extinct shield volcano on the border of Uganda and Kenya, north of Kisumu and west of Kitale. The mountain's highest point, named "Wagagai", is located entirely within Uganda.

volcanic centers.

Connection to East African rift system

The fault seems to have been partly reactivated during the

Neogene The Neogene ( ), informally Upper Tertiary or Late Tertiary, is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period million years ago ( Mya) to the beginning of the present Quaternary Period Mya. ...

in the section between the Albertine and Gregory rifts, and along its southern extension towards the Indian Ocean. The reactivated section of the Aswa lineament connects the eastern and western branches of the East African rift system. It seems also to truncate the Nyanza rift, which extends ENE from Lake Victoria. The section of the Aswa Dislocation between the two rifts forms part of the boundary between the Somali Plate and the African Plate.

References

;Sources * * * * Geology of Africa Seismic faults of Africa Shear zones {{palaeo-geo-stub