Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 Fig. 3. obtained are the resultants of the oscillations of the ground and of the seis- mograph. Fig. 4. Fig. 4 shows the curves obtained with o) = 2ir/l2 and /x = 2x/120 so that y = — cos(3/)°-fcos(30/)° x= 1 — cos(30/)°. When, as in this case, the period of the seismograph is ten times that of the waves, the undamped seismograph records the first wave fairly accurately. Now consider case (b) when the period of the seismograph is equal to that of the waves. If we putw^ju+e in the equati

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Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 Fig. 3. obtained are the resultants of the oscillations of the ground and of the seis- mograph. Fig. 4. Fig. 4 shows the curves obtained with o) = 2ir/l2 and /x = 2x/120 so that y = — cos(3/)°-fcos(30/)° x= 1 — cos(30/)°. When, as in this case, the period of the seismograph is ten times that of the waves, the undamped seismograph records the first wave fairly accurately. Now consider case (b) when the period of the seismograph is equal to that of the waves. If we putw^ju+e in the equation 230

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