APPENDIX J 

 HIGH-FREQUENCY SPECTRAL ANALYSIS OF FORCE AND MOTION DATA 



Appendix J contains the incident wave spectral plot along with the 

 autospectral and cross-spectral plots for the force and motion data for 

 record FH7-8. The data was recorded at Friday Harbor, Washington, on 6 

 January 1975 at 0030 hours. 



The incident wave spectra was unfiltered. All the force and motion 

 spectral data were digitally high-pass filtered at a cutoff frequency of 

 0.1 hertz. The autospectral data is plotted as a percent of the vari- 

 ance, i.e., the total area under the spectra. Wave heights, forces, and 

 motions were measured in feet, pounds, and feet per second square, re- 

 spectively. 



All spectra were computed from 2,048 data points sampled at 0.5- 

 second intervals. 



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