Storm and Surf Microseisms 



97 



Four of the storms developed far enough 

 away from Guam as to produce insignificant 

 swell at Guam. The swell, microseismic re- 

 sponse and center wind force of these storms 

 are illustrated in figures 1, 2, 3, and 4 and Ta- 

 bles 3, 4, 5, and 6. 



Table 3 



Table 6 



Table 4 



Typhoon Iris -- April-May 1951 



Each of these storms illustrate the point 

 that microseismic activity can be significantly 

 above noise level even when no oceanographic 

 activity reaches the coast. The first three of 

 these storms were almost completely unat- 

 tended by surf effects and the microseismic ac- 

 tivity reached a maximum of 85. It would 

 appear that the first crucial test was passed. 



Of the remaining storms which did pass 

 close enough to Guam to produce significant 

 oceanographic effects, two are presented here. 

 The first illustrates the case when center inten- 

 sification and swell arrival did not coincide, 

 Figure 5. The second shows Typhoon Allyn 

 which passed directly over Guam with both the 

 storm and swell reaching maximum amplitude 

 simultaneously, Figure 6. See also Tables 7 

 and 8. 



Table 7 



Table 5 



Typhoon Nora -- August 1951 



