Symposium on Microseisms 



over the shallower waters of the continental 

 shelf before microseisms are recorded and that 

 the wake of the storm continues to be important 

 in the generation of microseisms. This and 

 similar observations in the light of the 

 Longuet - Higgins (1950) theory, together 

 with the word of Deacon (1947) and 

 Darbyshire (1950), prompted the Naval 

 Research Laboratory group to conduct field 

 experiments during the 1951 hurricane season 

 designed to obtain data which could assist in 

 determining whether any correlation appears 

 to exist between microseisms and hurricane- 

 generated ocean waves. 



The installations of the field experiments 

 included the following: 



(1) A tripartite station on the West End 

 of Grand Bahama. 



(2) The installation of two wave gages at 

 Cocoa Beach, Florida, through the 

 cooperation of the Beach Erosion 

 Board and the University of Cali- 

 fornia. These gages were of the 

 pressure-sensitive type; the one was 

 similar to the type developed by 

 Woods Hole, and used quite extensi- 

 vely by the Beach Erosion Board, and 

 the other was developed by the Uni- 

 versity of California. These gages 

 were in water depths of about 29 and 

 46 feet respectively. 



OCT. 6-1700 

 00X6-0800 /SEPT. 10-1700 



40* 



40* 



\ 



SO* 



EASY 



SEPT. 5-1700 



BO* 



30* 



Figure 1. Map Showing Paths of Hurricanes "Easy" and "How" 



