O 



c 

 o 



o 

 o 



o 



40-i 



20- 



0- 1 

 40-i 



20- 



J 

 40-i 



20- 



J 

 40-i 



Jan 



o 



c 

 <v 



=3 

 O 



20- 



J 

 40-i 



20- 



0- 1 

 40-i 



Feb 



Mar 



Apr 



= i=iC2 0[zl 



May 



20- 



Jun 



Jul 



■71 



PI 



LdaizJ I 



Aug 



□hSI 



F1 





H 



^ 



^Mh0_^ 



Sep 

 Oct 



cz 



□0 



□ 





[7] 



Nov 



J _ D Q 



Is 



- ^vMWm 



1 1 — r 



Dec 



^ 







tAZ2\Z 



v\ 



mm& 



2 3 4 5 6 7 8 9 10 12 14 16 2 3 4 5 6 7 8 9 10 12 14 16 



Period, sec Period, sec 



Figure 20. 1980-86 monthly wave period distributions for Gage 630 



37 



