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Symposium on Microseisms 



high ocean waves near the recording stations. 

 Sources of energy near the storm center ap- 

 peared to play at best a minor role and even 

 that only as long as the storm was over the 

 ocean and not too far from the recording sta- 

 tion. More detailed results of this investiga- 

 tion which was sponsored by the Geophysical 

 Research Division of the Air Force Cambridge 

 Research Center, are to be published in the 

 Transactions of the American Geophysical 

 Union. 



In several microseismic storms recorded at 

 stations in California, the State of Washington 

 and in British Columbia during November- 

 December, 1951, the increase and decrease of 

 the microseismic amplitudes were more and 

 more delayed with increasing distance of the 

 recording station from the storm center. In 

 Southern California the time of the largest 

 microseismic amplitudes lagged the time at 

 which the storm center passed the coast (usu- 

 ally in British Columbia or in the State of 



Figure 5 



