The resonant acoustic pulser; a continuous-frequency marine seismic source

A marine seismic source is described which produces a continuous low‐frequency (10–100 Hz) harmonic signal. High acoustic power levels (∼20 kW) are reached by using a resonant system. The seismic source has been successfully tested in lake and ocean environments. Geophysical applications are discussed and modifications are described which would allow the source to be operated in a swept‐frequency mode.