Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 REFLEXION OF ELASTIC WAVES 135 4%%%% of the incident wave. This percentage rapidly decreases almost to zero until the critical angle is reached, and at greater angles of inci- dence 100%%%% of the energy is reflected as a longitudinal wave. These Fig. i.—Time-distance graph of wave fronts resulting from two layers. figures do not seem to be borne out in practical cases, as for angles of incidence ranging from perpendicular to 300 I have not observed any su
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 REFLEXION OF ELASTIC WAVES 135 4%%%% of the incident wave. This percentage rapidly decreases almost to zero until the critical angle is reached, and at greater angles of inci- dence 100%%%% of the energy is reflected as a longitudinal wave. These Fig. i.—Time-distance graph of wave fronts resulting from two layers. figures do not seem to be borne out in practical cases, as for angles of incidence ranging from perpendicular to 300 I have not observed any substantial reduction in the amplitude of reflected impetii. Consider now a seismograph placed at a point C and again erect an ordinate to 795
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