Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 T=2tt k=1/2 Fig. 17. 0 k-1/2 T=2rr Fig. 18. Figs. 16, 17, 18, show the curves for y, al( Oj, and — x in some simple the- oretical cases which need no explanation. The seismograph of course always records sudden movements correctly. Fig. 19 shows a seismogram of the waves due to an explosion of 1000 pounds of dynamite at a distance of 9870 meters. The seismograph was of the vertical mechanical type. The calculated Fig. 19. curve for the ground motion (x) is also shown. It appears that th
Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 T=2tt k=1/2 Fig. 17. 0 k-1/2 T=2rr Fig. 18. Figs. 16, 17, 18, show the curves for y, al( Oj, and — x in some simple the- oretical cases which need no explanation. The seismograph of course always records sudden movements correctly. Fig. 19 shows a seismogram of the waves due to an explosion of 1000 pounds of dynamite at a distance of 9870 meters. The seismograph was of the vertical mechanical type. The calculated Fig. 19. curve for the ground motion (x) is also shown. It appears that the explosion waves consist of a rapidly damped oscillation of period about sec. Several such waves come in at different times and all have about the same shape and period. In this case there were no geological anomalies in the neighborhood, but the wave velocity increased more or less uniformily with the depth. The 239
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