Effects of noise of offshore Effects of noise of offshore oil and gas operations on marine mammals : an introductory assessment effectsofnoiseof00gale Year: 1982 OOI 0D2 1 2 5 Frequency, kHz 10 20 100 Figure 2. Attenuation coefficients in decibels per kilo^ard as a function of frequency for sound propagation in sea water (Urick, 1975). G-45

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