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Effect of Bottom Currents on Recording Seismic Signals on the Seabed

  • MARINE GEOLOGY
  • Published:
Oceanology Aims and scope

Abstract

The recording of seismic signals at the bottom of water areas is in most cases accompanied by intense noise, whose sources are near-bottom currents. An effective way has still not been found to combat this phenomenon, which significantly impedes the development of a marine seismological network. The main problems are that such interference is generated both on equipment elements, which, according to the operating conditions, should be on the bottom surface, and on the unevenness of the bottom surface. In this study, a number of mechanisms for exciting such interference are considered, including due to the direct impact of stationary and nonstationary flows on the sensitive elements of bottom seismographs and due to the generation of seismoacoustic fields in the aquatic environment during vortex and turbulent flows. The results of recording seismic signals on the bottom, in the sediment layer, and in the bottom borehole in the presence of intense noise from currents are compared. A number of practical recommendations are given to significantly reduce the impact of such noise.

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ACKNOWLEDGMENTS

The author thanks his colleagues at IO RAS, the team at EDBOE RAS, as well as his coauthors in publications who have been actively involved in obtaining and discussing the materials that served as the base for this article for a number of years.

Funding

This study was carried out as part of state order (no. FMWE-2021-0004) of IO RAS.

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  1. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia

    D. G. Levchenko

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  1. D. G. Levchenko
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Correspondence to D. G. Levchenko.

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Levchenko, D.G. Effect of Bottom Currents on Recording Seismic Signals on the Seabed. Oceanology 62, 669–684 (2022). https://doi.org/10.1134/S0001437022050113

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  • DOI: https://doi.org/10.1134/S0001437022050113

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