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- Thu Mar 12, 2020 7:30 am
- Forum: Near Surface Geophysics
- Topic: Locating a man made tunnel
- Replies: 21
- Views: 8975
I advise you to use GPR with 200Hz antenna, I used it many times for such project, it is good enough to detect your tunnel, the 400Hz antenna can't go that deep especially if soil is wet or contain clay. Tomography is better for deeper and bigger target, also manipulating GPR is much easier... But y...