A' 



VERT. EXAGG: X 10O0 



V p -(4.0TO6.0km/sec> p . (23g/cc) 



100 



no 



B 



WATER 









B' 





N. MILES 



N. MILES 



f \ 



SEDIMENT 

 VERT. EXAGG: X 1200 



" 



t 120 



£ 130 



Q 



140 





SEDIMENT 



5 

 VERT. EXAGG: X 1000 



150 



"ROCK" 



(4.0 TO 6.0 km/sec) „ ,,, , , 

 P ■ (2.3 g/ccl 



IIITi 



160 



^rrfT^ 77 





VERT. EXAGG: X 1200 



Figure 2 . Sediment thicknesses at three locations 

 in the shallow Bering Sea; data from echo- s ound ing 

 records of the 1960 expedition and the sub-bottom 

 reflection studies of Moore, 



13 



whole of the shallow Bering Sea (as the title might imply) 

 and for the whole year. Further assumptions and conditions 

 are noted below each table. For the sediments, it is 

 necessary to enlarge on the method used in the laboratory 

 to obtain porosity (on which the values for sound speed 

 depend). The usual sediment in the areas under consideration 

 was sand. Ordinarily, this material cannot be cored and 

 only by diving can reasonably "undisturbed" samples be 

 obtained. In the laboratory the variations in porosity 

 (which might be expected) were determined by placing 

 actual samples from the area in loose and dense packing; 

 the value noted in the table is estimated to be a probable 

 in situ value . 



20 



