c „ 50 



O -o 



o o 



• — 



^ "»20 



9 O 

 O V 



t-o. to 



Use Left Scole 



(o) Huntington Beach 

 T„ = 6-7s 



24 Coses 



400' 



200 



6 8 10 12 14 16 18 20 



Period for Secondary ^^o,'*. (s) 



50 



f <J40 



i: " 30 



20 



(b) Huntington Beoch 



Tp =12-1 3 s 



1 173 Coses 



V — ^Use Right Scale 



\ 





i^^N. /p— l,^*N^ 



-o « \_ - ■ 



Use Left V^ 

 Scole -*^ 1 , — 1 





— iC 



« .? 

 O. X 



\— 



I— 



' 





6 8 10 12 14 16 



Period for Secondary Peak (s) 



18 



-800~ 



- 400 



20 



Figure 21. Frequency of occurrence and average energy for 

 secondary peaks as a function of secondary peak 

 period at Huntington Beach, California. 



47 



