scatter in the figure is due to the lower amplitude constituents. There is 

 also a surprising consistency in slope among the three records analyzed. 



Similar plots of phase versus frequency for Columbia Light are shown in 

 Appendix D, Figures D-2 to D-7 . Phases associated with second harmonic 

 frequencies are indicated by an x and a double-valued horizontal scale is 

 used. The figures give evidence of a trend for slow decrease in phase with 

 increasing frequency. 



Plots of phase versus frequency for South Pass are shown in Appendix D, 

 Figures D-8 to D-13. Most of the figures indicate a coarse trend for decreas- 

 ing phase with increasing frequency over the main energy-containing frequen- 

 cies (0.06 to 0.11 hertz); however, two figures (Figs. D-8 and D-13) indicate 

 the opposite trend. 



Most of the phase versus frequency plots for all three sites indicate a 

 general trend for decreasing phase with increasing frequency. However, a 

 comparison of initial and final MRS analyses for each record reveals a strong 

 tendency for increasing phase with increasing frequency over very small fre- 

 quency intervals. This tendency is shown in Figure 30 for one Columbia Light 

 record. The dashline in the figure has a large positive slope between the two 

 square symbols nearest the points labeled 6, 3, 2, 1, 4, 8, 5, 10, and 12. 

 The same tendency is evident in Figure 14 for a synthesized record. 



100 







300 



200 



100 



Fund.: 

 2d Harm. 



6 A 



Constituents 

 ■ Fundamental 

 X 2d Harmonic 



0.06 

 0.12 



0.07 

 0.14 



Frequency (Hz) 



0.08 

 0.16 



Figure 30. Phase change with frequency in successive MRS analyses at 

 Columbia Light, 1300 to 1308.5 P.d.t., 512-second record 

 analyzed. Numbers indicate amplitude rank for constituents. 



50 



