Re:Why do we still not know what's inside the pyramids?
by shiftpgdn on Monday November 16, 2015 @08:41AM
(#10574323)
Electromagnetic imaging is actually used at depths up to 10km (and more). Many oil/exploration companies use it along side traditional imaging to get a better idea of what is in the earth.
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Re:Why do we still not know what's inside the pyramids?
by vlehto on Monday November 16, 2015 @09:10AM
(#10574471)
Yes. The most interesting applications I have head of is exploring ice caps. To depths of several kilometers.
http://earthzine.org/2008/09/26/a-brief-history-of-radio-ech...
But they had huge advantage of no surrounding civilization. Power line above you can easily "echo" in the picture that should come below you. I've used one myself to see some plumbing.
But the resolution gets poor quickly as you go deeper. Most common applications seem to be inspecting rebars from reinforced concrete and inspecting roads for subsurface problems. Both in range of just few meters.