Wilson (1972) 



U 



Figure 32. Resonant amplification on a shelf. 



SOLUTION : d g = 15 meters and a = 621 meters. 

 From equation (189) 



Tj = 3.2417 



W c 



T = 3.2417 



621 



/9. 807(15) 



= 166 seconds (2.77 minutes) 



From equation (190) 



T 2 = 1.9254 



^ 



T = 1.9254 621 — =98.6 seconds (1.64 minutes) 

 2 /9. 807(15) 



************************************* 



A different means of calculating the amplitude U, which will also 

 account for refraction effects (i.e., the effect of a nonuniform offshore 

 bathymetry) , is suggested by Wilson (1972) . These equations are 



N • , 

 J + l 



C + B .D . , 

 3 <7 +1 



(192) 



95 



