Attenuations and amplitudes of seismic waves

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Abstract
In researches previously published [Ricker, 1940, 1941, 1943, 1944, 1945], the author fast shown theoretically that the disturbance created by the detonation of a small charge of explosive in a homogeneous and isotropic Earth assumes a certain characteristic form, shaped by the Eartr absorption spectrum for elastic waves. This form and its variants have been called seismic wave. According to the theory, when observed at a great distance from the explosion, the wavelet should assume a symmetrical form. Figure 1 shows the form of the displacement, and represent the motion of the trace of a mechanical seismograph as it would record the motion, the mechanics seismograph being properly designed so as to avoid distortion.