FIG. 12. (Color online) Low-pass (<20 Hz) filtered airgun signals received on a bottom-mounted hydrophone at different distances from the signal source. The waveforms are aligned at the arrival time of high-frequency waterborne waves (vertical dotted line). The dashed line indicates the arrival times of the head wave propagating along the interface of the rigid basement at a depth of approximately 1000 m below the seafloor.
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