2 4 6 8 10 15 

 SIGNIFICANT WAVE HEIGHT in M 



Figure 3 Evaluation of the severest significant 

 wave height for North Sea data 



S2.0 



o 



1.0 



SIGNIFICANT WAVE HEIGHT IN FT 

 10 20 30 40 



NORTH PACIFIC 

 NEAR ARGUS ISLAND 

 NEAR BRITISH ISLES 

 MEDITERRANEAN 

 SOUTH ATLANTIC 



2-PARAMETER SPECTRA 

 6-PARAMETER SPECTRA 



2 4 6 8 10 12 14 



SIGNIFICANTWAVE HEIGHT IN M. 



Figure 4 Extreme values of the wave-induced transverse 



force on a semi-submersible platform in a seaway. 



Comparison between the upper and lower bounds of the 



forces and those computed using the worldwide measured spectra. 



106 



