... of the small weight m2is the greater. This is indicated in Fig. 8. SOILDYNAMICS. Soil dynamics is one aspect of soil mechanics. Although ground vibrations dueto heavy industrial machinery have often been locally dubbed earthquakes, it can now be affirmed that these are the same phenomena. If the subject...

... of horizontal earthquake motion had shown, in different localities, prevailing frequencies ranging from about 1 cycle to 10 cycles per second. Those had been considered to be the result of natural vibration of the ground. With regard to the mode of vibration of buildings (p. 23), was the dynamical distortion...

... of earthquake-resisting structures had been studied seriously for many years and a reference to it had been introduced into the Paper ionrder t o show the similaritybetween earthquake vibrations and vibrations resulting from mechanical sourceR. The earthquake zones of the world were very widely distributed...