Why multi-frequency approach on shallow water seismic investigation?

Abstract:

Seismic profiling is a well-known geophysical method for underwater geological and geotechnical investigation Bathymetric surveys are applied when Project needs information about the thickness of water column. Waterways, harbors and reservoirs are examples of environments that necessitate this kind of data. On the other hand, if images from bottom surface become important information for certain projects, a side scans sonar or even a multibeam echosounder system can play an important role in the underwater investigation process. However, if data from subsurface should be available for the project, continuous seismic profiling methods must be applied. When talking about seismic profiling we should discuss many types of seismic sources, from the ones which operate with operate with low energy and a wide range of frequencies (3 to 20 kHz) like chirps and the classical sub-bottom profiler (SBP), to the ones which deal with high energy like boomers and sparkers. Actually, in certain projects, is not simple to choose the right seismic source for sub-bottom profiling. Some recent field experiences have shown that using a large spectrum of frequency, from 500Hz to 500Hz, simultaneously, seems to be the best way for shallow underwater investigation in order to get the best and suitable final product


Reference:
SOUZA, Luiz Antonio Pereira de; SILVA, Mariucha da; OLA, Kim. Why multi-frequency approach on shallow water seismic investigation? In: INTERNATIONAL CONGRESS OF THE BRAZILIAN GEOPHYSICAL SOCIETY & EXPOGEF, 13., 2013, Rio de Janeiro. Proceedings…

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