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Figure 12. Hydrophones used on the cruise. Top: The Ocean Sonic Eth-X2 hydrophone, used for measuring sound during the Seismic shooting approach at the three WBAT stations. Middle and bottom: The hydrophone buoy, that contained two omnidirectional hydrophones (Naxys 02345, frequency range: 5 Hz to 300 kHz, sensitivity: -179 dB re V/μPa). The hydrophone buoy was sat out for 24h during which there were hours with and without seismic shooting. Picture top from web page, middle by Karen de Jong and bottom by Anne Christine Utne Palm.
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