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Can sonar be used in the ground instead of water?

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Earthscope is a wiki entry dealing with Seismic tomography which is close but not exactly analogous to sonar. I recalled Schlumberger from a job interview long long ago. At the time they were recruiting for their program of searching for likely geologic formations containing oil. read more

Sonar or so(und) na(vigation) r(anging) works in a manner similar to radar, except sonar uses pulses of sound waves underwater to find the distance to a sound-reflecting target. Since the speed of sound is about 196,000 times slower than light(in sea water), the response time for sonar is proportionately longer. read more

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