Crustal and upper-most mantle structure in the Gregory Rift, East Africa.

This is a PhD project to study/analyse the velocity structure of the crust and upper-most mantle around the Gregory Rift, the southern part of the eastern branch of the East African Rift in Kenya. Data have been recorded with a network of seismographs in central and SW Kenya for two years, registering both teleseismic events and ambient microseismic noise. The distant events have been analysed using the receiver-function technique to constrain crustal thickness and shear velocity in the crust and upper-most mantle. Surface waves recovered from the ambient microseismic noise by correlation have been used to estimate phase-velocity variations in the region and thus also the distribution of shear velocity into the upper mantle. The motivation is to improve our understanding of geodynamic processes around the rift.