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The detection and location of a low-frequency seismic source is an increasingly significant environmental problem which is made more difficult by the complex nature of a seismic signal and the effect on it of ground transmission. The topic is discussed here in the context of augmenting a conventional undergraduate course in introductory waves and vibrations. Investigations are made of the geophone as a detector, the problem of seismic noise, the variation of seismic signatures with range and their interpretation, and a simple array for source direction.