APPENDIX A: WAVE SPECTRAL PLOTS OBTAINED DURING 
PASSAGE OF HURRICANE ALICIA 
1. A series of wave spectral plots obtained at the Shell 0il Company 
platforms Vermillion 22, Eugene Island 100, and Bay Marchand 2.Q during passage 
of hurricane Alicia are included in this appendix. 
2. The data were obtained using a subsurface pressure sensor hardwired 
to self-powered, self-contained, internally recording data loggers. Wave 
records were obtained at 3-hr intervals and consisted of 1024 data points 
sampled at 1 Hz. The pressure data were analyzed by means of a Fast Fourier 
Transform and each spectral component was compensated for pressure attenuation 
using linear wave theory. Components of the resulting periodigram were block- 
averaged to produce spectra with 32 equivalent degrees of freedom. 
Al 
