tude . spectrum from this large province, aad shows the same two-process 

 nature of the spectrum la Figure 5-11. In fact, this spectrum Is almost 

 Identical to the measured spectra from the Tufts Abyssal Plain and the 

 Cascadla Basin. 



Figure 5-13 shows the location of profiles with this characteristic 

 spectrum. Some of these profiles are over 200 nm long, and the profiles 

 are distributed over an area more than 1000 nm In extent. The total 

 standard deviation for the spectral parameters In all fourteen profiles 

 was only 0.15 for the slope (b) parameters and 0.02 meters for the 

 intercept (a) parameters. These values apply to both the lower fre- 

 quency and higher frequency line segments. The area may well extend 

 even further northeast or southwest. Profiles are only broken by sea- 

 mounts or deep-sea channels associated with submarine canyons. As such, 

 one can see that the areal extent of a roughness province with a given 

 level of allowed non-stationarity, can vary from hundreds of thousands 

 of square miles to the slopes of a single seamount. 



77 



