Amplitude Distribution of Storm Microseisms 



27 



Figure 7. Forecasting movement of storm by microse i smic amplitude at Guam, Okinawa 



and Manila 



crossing decreasing lines of equal amplitude, 

 and the microseisms should have been decreas- 

 ing if the intensity of the storm had remained 

 constant. The fact that the observed micro- 

 seisms were too large at each station to fit the 

 proper amplitude chart gave every evidence 

 that the storms were increasing in intensity. 



Microseismic stations can detect tropical 

 storms long before their existence can be de- 

 termined except by direct observation by planes 

 or ships. This priority of detection is some- 

 times difficult for the Carribbean stations be- 

 cause of the presence of many islands with 

 weather facilities between the possible source 



