Studies on Seismic Waves

This thesis embodies three separate studies on seismic waves. The first one is concerned with the origin of the oscillatory nature of earthquake waves. Different modes of generation have been discussed in some detail, particularly the theory of Kawasumi and that of Sharpe. The effect of the possible failure of Hooke's law on the nature of the seismic waves is also explained briefly. The second is a short note dealing with the physical basis of two kinds of observations: the observation of velocity and the observation of period. The third part is a study on the theory of FLANK WAVES. The basic difficulties of the old theory are pointed out and discussed. The phenomenon is explained in the light of the wave theory, in considerable detail in the case of P waves and very briefly sketched for the case of SH waves.</p