Talk:Sonar/Archives/2017

Sonar for underground imaging?
I thought there was a type of sonar that could be used for underground imaging, but I saw nothing about this in the article. I'm not talking about Ground-penetrating radar, because that uses radio waves. Does anyone have any information on this? A simple Web search turned up nothing useful. David Spector (talk) 20:38, 17 May 2017 (UTC)
 * Reflection seismology, but not the easiest article to find under that name. Andy Dingley (talk) 22:05, 17 May 2017 (UTC)

External links modified
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 * Added archive https://web.archive.org/web/20060718014532/http://www.st.nmfs.gov/st4/protocol/Acoustic_protocols.pdf to http://www.st.nmfs.gov/st4/protocol/Acoustic_protocols.pdf
 * Added archive https://web.archive.org/web/20060514165318/http://www.ifremer.fr/sympafae/ to http://www.ifremer.fr/sympafae/
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