42 PROFESSOR HOR 



whilst fig. 9 shows the 



is attempted of the wh 



These results are of ; 



on purely ideal assump 



modified by the actual 



for a surface impulse \v 



distance great compare 



in the wave-profile at ' 



the disturbance is the 



chief qualitative cliffe 



the minor tremor, who 



spherical elastic wave? 



so that the first twc 



accelerated relatively 



will travel, with the v 



It is a more difficult 



produced by heterogt 



qualitative effect of ; 



even considerable disc 



compared with the 



material over the sol 



modifications, with so 



It must be acknowl 



from the records of se 



to the long succession 



It would appear tha 



are to be ascribed t 



Again, the theory g 



magnitude, and in tl 



comparison can be i 



observations, on the < 



The difficulty must o 



clearly recognised 1 



question the compete 



* Of. R. D. OLDHAM, l< 



t The theory of free R 



| This term is used in 



a solitary wave travelling 



analogous to " oscillatory 



A ... -,.,,*, 



i 





.Ifl-Rt .qq ,i 



6 miJjifitfr 



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 VI ,80fi .Io* ,A ..arunT .Ii/14 .'// I. mult 



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