-100 n 



Of 



-50 



UJ 





1— 





UJ 





5 







I 





*- 





UJ 



50 



O 





100 



10' -I 



^10° 



g 10-' ■ 



Sio-^' 



^ 10-' -I 



a 



UJ 

 N 



5^10 



10-5. 



10-* 



10- 



16 



24 32 40 



DISTANCE (KILOMETERS) 



48 



56 



10' 10° 10' 



FREQUENCY (CYQES/KI IOMETER) 



10' 



Typical amplitude spectrum of profiles collected on the 

 Tufts Abyssal Plain. Spectrum shows two distinct 

 straight-line segments * which Intersect at a spatial 

 frequency of ~0.4 cycles/km. The longer wavelength 

 portion Is described by b » -1.847, a = 0.0294 m. The 

 shorter wavelength segment Is described by b = -0.541, S = 

 0.113 m. Profiles from the Cascadia Basin province have 

 similar spectra, however the model parameters are slightly 

 different. 



74 



