10000 



\ LOG U(h) = - 5- 3 LOG (f) + a 



Y 



RAGE DEEP ISOTHI 



1000 



100 



10 



0.01 



0.10 



FREQUENCY (CPM) 



1.00 



Figure 36. Average power spectrum of 25 shallow and 25 deep isotherm depths. The 

 slope of —5/3 in the log- log relationship is indicated. 



69 



