A Nomogram to calculate the Dynamical Magnification of Seismograph

Abstract

The author prepared a nomogram (Fig. 3) for calculating the dynamical magnification to evaluate the real amplitude of earth's motion from seismological records. It is consisted of two straight lines and one network, and only one operation on it is sufficient to attain the aim. In the nomogram, V; u, T₀, T and W mean the fundamental magnification, damping ratio, proper period, of the seismograph, period of the earth's, motion and the dynamical magnification defined by respectively.