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Fig. 1. (A) Schematic side view drawing of the obstacle (ditch) created across the mole-rat tunnel (upper part), and an overhead photo of a bypass burrowed by a mole-rat around a ditch (lower part). The location of the recording geophones used to record the seismic waves produced by the mole-rat while it dug the bypass tunnel are marked schematically (filled circles): a, small ditch; b, location of the original tunnel; c, bypass tunnel around the ditch. (B) Typical seismic signal and amplitude spectrum generated by the mole-rat during bypass burrowing recorded by the geophones in the field. (C) Synthesized wavelet pulse that matched the amplitude spectrum of a typical mole-rat's seismic signal recorded in the field, used in the computer simulations.





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