Abstract
Durham University's seismic array at Kaptagat was set up on the western
flank of the Kenya Rift. Analysis of the first arrivals of local
and regional earthquakes recorded at the array has provided a crustal
model across the Rift margin. It is concluded that a steep structural
boundary separates normal shield crust and sub-Moho material beneath
the western flank of the Gregory Rift from a mantle derived crustal
intrusion beneath the Rift axis. A detailed model of the shield crust
is presented and an indication is given of the complex structure
which probably exists beneath the Rift itself.
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