



Positive 



Positive 



Season 



Total 



Gradient, # 



Gradient, % 



FaU 



49 



47 



96 



Winter 



50 



50 



100 



Totals 



99 



97 



98 



Spring 



80 



16 



20 



Summer 



75 



20 



■ 27 



Totals 



155 



36 



23 



Table 3.7. Lands End profiles. 











Compressional 











Thickness, 



Depth, 



Velocity, 



Attenuation, 



Density, 



Layer 



Material 



m 



m 



m/s 



(dB/km)/Hz 



g/cm3 



Sea Floor 









R= 1.116 













Sfc 



1670 



0.50 



1.85 



1 



Silt-clay 



30 



5 



10 

 20 



1710 

 1730 



1747 



0.38 

 0.34 

 0.30 











30- 



1757 



0.28 



1.85 



2 



Mudstone 



290 



30+ 



1800 



0.03 



2.0 









320- 



2090 



0.02 



2.12 



3 



Sedimentary 

 rock 





320+ 



4360 



0.01 



2.64 



Table 3.8 Sediment properties of the Lands End site. 



3.5 Korea Strait 



The area chosen for the Korea Strait site was a two-degree square, 32°-34°N, 

 126.5°-128.5°E, which includes the locations of the 1966, Fasor Station OAK and the 

 SHAREM 26 trials (1978) (Reference 9). The area and site are shown on the bathymetry 

 chart in Figure 3.9. 



A summary of the sound speed profile data set is given in Table 3.9. This data set 

 is quite large with over 500 profiles after excluding those from 1943. The positive gradient 

 profiles are 85 percent for fall and winter and 27.6 percent for spring and summer. 



Representative sound speed profiles for the Korea Strait site are shown in Figure 

 3.10 to the average water depth of 128 m. The winter profile has a small (average .02) 

 positive gradient from surface to bottom while the summer profile has relative strong 

 negative gradients below 10 m depth. 



9. Reference available to qualified requestors. 



29 



