PROPAGATION OF ELASTIC WAVES IN LAYERED MEDIA BY ...

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_ _ AxR386 BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICANakano (1925), who gave the solution for high frequencies, this wave occurs beforethe minimum distance at which the Rayleigh wave is supposed to exist. The samewave has also been found at the epicenter by a different method. (Unpublished work20.0 /16.012.0Cl~ 8.CRECEIVER AT SURFACEI~x 4.CIAxR2< ~ -BxR2tv,,/d-4.C 210 [I ' '.0 I4:0 '?=4.0It ~ 14.08.0 IO.O 12.02m,- 4.0 I8.04.0× ~J ~ .
PROPAGATION OF ELASTIC WAVES IN LAYERED MEDIA 387by Alterman and Abramovici. See also the curves for r/H = .28(0 = 2 °) given inFigure 24 of the paper by Alterman and Abramovici (1966). The observation pointin this case is very near the epicenter.) Finally, we remark that the first curvein Figure 11 can be used as an additional check on our finite difference equation12.08.0m, 4,0X&x034.0I%4.0~3/2.0CDIX/ ~ V E R AT SURFACEAxR 2I) -BxRei i I I i4.0 ~.0 12.o ~6.0 ~v./a -~'--I RECE,VERAT DEPTH d/2.~ ~ AxR 2, ,/'-'~~, -BxRz, tvl,/d\/ O PT. o-AxR 24!~ J ~""~ -B x R2~j I I i,.0 12.0 ,EJ,',,/a-2.0FIG. 13. Horizontal and vertical displacements on and below the surface of an elastic halfspace.A compressional point source of pulse width 1.6 is located below .the surface.(vcl = %/3v,1 ,) The three curves are for observation points located on the surface, and atdistances of 0ne-half source depth and one source depth below the surface. The horizontaldistance of the observation point from the epicenter is equal to a distance of Six source depths.
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