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Can anyone tell me the difference? Seems the GPR is used on land and SBP is used underwater. Other than that, what the difference?
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Difference between GPR and Subbottom Profiler
Ground Penetrating Radar uses electromagnetic radiation to create images of subsurface structure, based on the relative electromagnetic reflective/conductive properties of the geology.
Subbottom Profilers use acoustic signals (much like seismic reflection/refraction techniques) to create images of subsurface structure. In that case, it is acoustic reflective properties of the geology that produce the images.
A critical difference, aside from the source energy, is applicability: Subbottom profilers are typically used in underwater settings, as you have said, but there are no restrictions to whether you use the profilers in saltwater or freshwater. However, GPR is not very useful in saltwater because saltwater, as a conductor, attenuates the electromagnetic radiation and prevents any type return signal to produce imagery. There has been some use of GPR in freshwater, though.
There are also differences regarding resolution and that sort of thing, but alot of that depends on the frequencies of sub-bottom profilers and GPR systems that are being compared.
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