On Theories of the Origin of Microseisms 



125 



the frequency spectrum of the waves if the 

 scale was divided by two. There was also a 

 theory which appeared to be very satisfactory. 

 On the western side of the ocean great empha- 

 sis was placed on the possible effect of micro- 

 barometric oscillation which looked nothing 

 like the microseism records; if they had any 

 period it was the wrong one, and the theory 

 used to explain the energy transfer required 

 confirmation at many points. The theory used 

 on the eastern side of the ocean was held to be 



unsatisfactory. 



It might be useful to concentrate more ef- 

 fort on the study of the phenomenon when it 

 appeared to be simplest. It would be very use- 

 ful if a seismologist from the United States of 

 America could come to England to work on 

 wave and microseism recordings made in the 

 United Kingdom; he would be sure of a warm 

 welcome and plenty of material to work on. 



