. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. CALCULATION OF MOTION OF GROUND 95 Suppose that y *= 0 when / 0 and k = 0. In this case — x = a cos pt+ap2fo'{fo' cos ptdt\dt which gives — x = a. Thus in this case the ground suddenly moves a distance a at / = 0 and then remains at rest. j V t —/. 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 seismog
. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. CALCULATION OF MOTION OF GROUND 95 Suppose that y *= 0 when / 0 and k = 0. In this case — x = a cos pt+ap2fo'{fo' cos ptdt\dt which gives — x = a. Thus in this case the ground suddenly moves a distance a at / = 0 and then remains at rest. j V t —/. 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Society of Exploration Geophysicists. Tulsa
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