During January 1967, 28 sites were occupied in the Eastern Rift in Kenya with three high-frequency, high-gain, portable seismographs. The microearthquakes recorded seem to be confined primarily to the center of the rift. They are directly related spatially to faults, some of which first formed in the early Tertiary, to a geothermal area, and to a recently dormant volcano. This study gives a clearer picture of the relation of seismic activity to rifting than is possible with the larger earthquakes routinely located by the world-wide seismic stations.

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