LIST OF FIGURES AND TABLES 

 Figure Page 



1 . Names of Selected Physical Features 2 



2. Annual Approximate Depth and Average Area I Extent of Upper 



Sound Velocity Minimum 8 



3. Annual Approximate Depth and Average Area I Extent of 

 Intermediate Sound Velocity Maximum ° 



4. Number of Observations Analyzed for Upper Sound Velocity 

 Minimum and Intermediate Sound Velocity Maximum (all 



months) 10 



5. Annual Average Depth of Deep Sound Channel Axis ''^ 



6. Annual Average Deep Axial Velocity '^ 



7. Number of Observations Deeper than Deep Sound Channel 



Axis (all months) '° 



8. Basins with Different Sound Velocity Structure Below 2000 

 Meters 



19 



9. Average Critical Depth for Northeast Monsoon (Nov-Apr) ... ^2 



10. Total Number of Observations for Northeast Monsoon 



(Nov-Apr) 23 



11. Average Critical Depth for Southwest Monsoon (May-Oct) ... ^4 



12. Total Number of Observations for Southwest Monsoon 



(May-Oct) 25 



APPENDIX A 



A-1 . Location of Selected Sound Velocity Cross-sections (Figures 



A-2 through A-1 3) 35 



A-2. Sound Velocity Cross-section Between 15° and 16° N. Latitude 



and into the Gulf of Aden for Southwest Monsoon (Jui-Sep) . . ° 



