List of niastratlons 



4-1 Scale dependence of statlonarlty of the 



mean 18 



4-2 Method of Davis (1974) for defining homo- 

 geneous provinces in a designated wave band 20 



4-3 Typical amplitude spectrum of sea-floor topog- 

 raphy 23 



4-4 Spectral estimates derived by T.H. Bell 



(1975b) 27 



4-5 White-noise level of an amplitude spectrum 31 



4-6 Effect of directional sampling of corru- 

 gated surface 33 



4-7 Ba thyme trie chart of the Mendocino Frac- 

 ture Zone 36 



4-8 North-south profile of Mendocino Ftacture 



Zone and amplitude spectrum 37 



4-9 East-west profile of Mendocino Ftacture Zone 



and amplitude spectrum 38 



4-10 Comparison of Figures 4-8 and 4-9 39 



5-1 Importance of prewhitening of amplitude 



spectra 51 



5-2 Relationship of spectral slope parameter 

 to the aspect ratio of sinusoids at dif- 

 ferent frequencies 54 



5-3 Microrelief map of sea floor collected 



August 16, 1981 57 



5-4 Microrelief map of sea floor collected 



July 20, 1981 58 



5-5 Composite spectra from sea-floor microrelief 59 



5-6 Typical phase spectrum and statistical distri- 

 bution of phase angles from sea-floor relief 61 



5-7 Distribution of roughness in the vicinity 



of the Gorda Rise, Northwest Pacific Ocean 63a 



xiii 



