174 ON THE PROPAGATION OF EARTHQUAKE .MOTION TO GREAT DISTANCES. 



those set up by lesser ones ; from this it may lie concluded that the rate of propa- 

 gation is, in some way not yet worked out, a function of the size of the wave. 



10. The rate of propagation of the waves of this phase is, in the case of great 

 earthquakes, higher than that which has been calculated for purely elastic surface 

 waves, and from this, and from the fact that their rate of propagation seems to be a 

 function of their size, it is probable that their propagation is, at least in part, 

 gravitational. 



WOBTHIIf. l 



'OLE, E. 

 studii 



