Abstract
With the growing interest in borehole seismic investigations such as vertical seismic profiling and crosshole surveys, the need for new instrumentation has arisen, especially in the area of seismic sources. An ideal seismic downhole source should be nondestructive to the well, provide enough energy to be recorded at useful distances, produce a broad band of seismic frequencies, and create a reproducible signal. A prototype of a source that fits these requirements has been constructed and was described in a previous paper (Hardee et al., 1987).
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