| 摘要 |
1. Method for detecting mechanical discontinuities in a medium to be explored 2. It is characterised in that compression and shear waves are emitted separately from each other, the signals corresponding to the said waves are recorded on separate traces, and for each place of emission, at least the time-of-flight ratio of the said waves between the emitter and the receivers is calculated. 3. Application in particular to the detection of cavities in the subterrain in line with a tunnel. <IMAGE>
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