Abstract
Sparker and explosive-type marine seismoacoustic signal sources are described, which can be used to solve engineering seismic survey problems in water areas. The problem of surface wave excitation in water area conditions (moreover, in the presence of ice cover) is quite relevant due to the intensive development of surface-wave methods in land seismology. The paper presents the results of an in situ experiment in the ice conditions of Lake Ladoga, devoted to recording seismoacoustic signals in the water column (with hydrophones) and on shore (with a seismic receiver). Processing and analysis of experimental data demonstrated the possibility of applying the coherent integration procedure for a sparker impulse source in order to increase the signal-to-noise ratio of the initial hydroacoustic and seismic data. The waveforms of the signals received in the water column and on shore were obtained as the waves passed through a shore wedge in the presence of sheet ice. The coherence coefficient of signals generated by a sparker and airgun is estimated. The dependence of the signal-to-noise ratio on the number of summed pulses during coherent integration was analyzed. The results point to high quality of the sparker equipment developed at GEODEVICE and demonstrate the possibility in principle of using a sparker to generate seismic waves, including surface ones.
Published Version
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