Abstract
A downhole seismic source for use when drilling a borehole in the earth using a rotating drill string through which a drilling fluid is circulated. In one embodiment, a section of the drill string has a slot in it and a sleeve rotatably surrounding the slot with a plurality of spaced-apart slots arranged to align with the slot in section of drill pipe during rotation of the sleeve with respect to the section. In operation this generates a controlled seismic signal. In another embodiment the bit is modified to have a fluid passage with a valve therein that opens and closes in a selected pattern during rotation of the drill bit.
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