40- 



20- 



Jan 



0- 

 40- 



20- 



_l c=3 zzn 



XA 



V\ 



lAmlZA I 









Itf 



40 



<o 





o 







20 



i_ 





i_ 





-j 





o 





o 







o 





4— 



40 



o 





>N 





o 







20 



3 





O" 





(1) 





Feb 



Mar 



dSB^ 



y a w i 



Maizi I 



l£ o- 



40-i 



20- 



Apr 



□ 



May 



1 



Q 



o 



40- 



20- 



Jun 



U- 



U 



]A 



% 



m 



Jul 



rz 



Aug 



Q 



Sep 



ca 



Oct 



a 



Nov 



, 





n 







^BHyHz] 





ra 



oIZI 



5 



Dec 



-E2 



^1 



i i r i i f i i ( i i — i 1 — i i f i i r i " " i 



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 B7 . 1980-1990 monthly wave period distributions 

 for Gage 630 



B20 



