Storm and Surf Microseisms 



101 



These speculations have led to the develop- 

 ment of the 1952 program for microseismic re- 

 search for the Navy. Wave recorders have 

 been installed around Guam. The amplitude 

 and period data are being so recorded that 

 machine subtraction from the microseismic re- 

 cord will be possible. Perhaps by a frequency 

 analysis the question of where microseisms 

 originate will be solved. To amplify the wave 

 recorder data, further visual observations are 

 being made. Aerologists aboard weather re- 

 connaissance planes are using their drift me- 

 ters to measure the wave length of the swell 

 approaching the coast as well as that leaving 

 the storm. 



Discussion 



B. Gutenberg 

 California Institute of Technology 



Dr. van Straten in her careful investi- 

 gation came to the conclusion that hurricane 

 microseisms are partly generated within the 

 storm area, partly by surf effects, and that the 

 latter are dominant. As a result of a recent 

 investigation of microseisms connected with 

 non-tropical storms approaching the Pacific 

 coast of the United States, the present author 

 has reached the similar conclusion that these 

 microseisms derived their energy mainly from 



Figure 4 



