## Earth Waves |

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acceleration amplitude angle of incidence angular frequency apparent velocity arrival axis c/sec complex numbers components computed constant curve damping decrease depth discovery record displacement distance dynamite blasts earth waves earthquake earthquake waves elastic energy equation Fermat's principle forced vibrations formulas ft/sec galvanometer Harvard horizontal inertia member initial conditions instrument L. D. Leet layers longitudinal longitudinal wave magnification mass maxima microseisms mirror Mississippi Lime modulus natural frequency natural period obtained oscillate P-wave parallel particle path phase plane position propagation radians Ramirez ratio Rayleigh waves rays reach real numbers reflection method refraction represented Reversed profiles salt domes seismic prospecting seismo seismograph seismology shown in Fig shows simple harmonic motion slope solution of Eq steady-state storm surface waves symbol tion top of medium transducer transverse waves travel-time graph travel-time line tripartite network true velocity vertical wave front wave types X-axis zero