90 



Symposium on Microseisms 



some parts of the record every hour. The rela- 

 tive position of curves A and B has no signifi- 

 cance since the two curves have been shifted 

 with respect to each other. However, the 

 value of the arbitrary units for A and B is the 

 same. 



The sharp increase in both wave height 

 and period as shown in curves C and D on the 

 morning of September 8 accompanied the arri- 

 val of the swell from "Easy." Data from a 

 Beach Erosion Board gage at Cape Henry and 

 a report from Weather Ship H, several hundred 



miles east of Charleston, N. C, also gives added 

 evidence that the wave activity shown by 

 curves C and D on Sept. 8 is associated with the 

 arrival of swell from "Easy." The micro- 

 seisms as recorded at Orlando on 8 Sept. show 

 some increase in amplitude at approximately 

 the same time as the maximum wave activity at 

 Cocoa Beach. This increase in amplitude was 

 not at all pronounced; in fact this particular 

 period of microseisms normally would not have 

 received any attention as being an indication 

 of anything unusual. The record was too 

 erratic to permit an analysis of the most pro- 



HURR1CANE HOW - OCTOBER. 1951 



Figure 3. Micro-seismic and Water Wave Activity During Hurricane 



"How". 



