APPENDIX I 

 LOW- FREQUENCY SPECTEIAL ANALYSIS OF FORCE DATA 



Appendix I contains the low-frequency autospectral and cross-spec- 

 tral plots for record FH7-8. The data were recorded at Friday Harbor, 

 Washington, on 6 January 1975 at 0030 hours. 



The original time series were low-pass filtered at a cutoff fre- 

 quency of 0.2 hertz and every eighth data point used to generate a new 

 time series. This gives 256 points with a sampling period of 4 seconds, 



192 



