The King Sa'-non data, one analysis of which is seen in figure 10, shows a 

 pronounced peak in signal level at 40 Hz, one-half the frequency of the peak 

 seen in Ocean Bounty data. A steep slope of about about +17 dB per octave is 

 seen at frequencies below this peak, with the falloff above the peak at about 

 -2 dB per octave. There is no suggestion of a rise in levels below the lowest 

 one-third octave band analyzed. 



Data from production Platform Spark (figures 11, 12, and 13) show a peak 

 at a lower frequency than was evident in the previous figures. There is now a 

 peak at 20 Hz and, as in the King Salmon data, no indication of energy present 

 below the 12.5 Hz one-third octave band. The lower end slopes of the data in 

 figures 11 „ 12, and 13 are in the order of +40 dB per octave. The data above 

 31.5 Hz may be visually separated into two bands above and below 630 Hz. 

 There does not seem to be any pronounced change in analysis pattern with 

 change in hydrophone depth. 



As mentioned previously, these analyses are preliminary due to the short 

 time available since the trip to Cook Inlet, Alaska. 



D-8 



