Because the MRS analysis technique identifies only those constituents 

 containing substantial energy, it can never identify all constituents in the 

 bound set from analysis of one particular record. Some information about 

 important frequencies in the set can be obtained by matching constituents in 

 MRS analyses of successive records, a technique already used to advantage in 

 this study. Although a detailed analysis of available information about the 

 set does not seem warranted, the possibility of a characteristic frequency 

 spacing between bound constituents merits further consideration. 



It is assumed that many of the bound constituents in the high energy part 

 of the spectrum are identified in each MRS analysis. The distribution of 

 frequency spacing between successive MRS constituents was estimated from all 

 analyses for each of the three sites (Fig. 48). The range of efp values 

 computed for each site is indicated in the figure. The peak of the distribu- 

 tion curve indicates a preferred frequency spacing of about 0.0012 hertz for 

 South Haven, 0.0028 hertz for Columbia Light, and 0.0022 hertz for South Pass. 



SOUTH HAVEN 



0.5 6 fp 



0,004 0008 0012 



Frequency Spocinq Between Constituents (Hz) 



Figure 48. Distribution of frequency spacing between 

 MRS constituents. 



The BF-type instability would be expected to lead to frequency spacings 

 of Efp« efp for the Columbia Light records is approximately 0.0020 hertz 

 which is within 30 percent of the modal frequency spacing between constit- 

 uents. Thus, the BF instability is a possible explanation for the frequency 

 structure of constituents in the Columbia Light records. 



69 



