Earthquakes and Structures

This paper is made up of two sections. Section I, written by Mr. Galloway, refers briefly to the work of the Earthquake Committee of the Society formed in 1923, and to its report. The nature of the earthquake waves is described and some reference is made to their cause, complexity, and characteristics. Some notes are added of the relation between earthquake waves and the structures that may be subjected to the forces arising therefrom. Section II, by Professor Hoskins, considers the nature of the ground motion, gives certain fundamental rules and conclusions, and investigates the theory of flexure of vertical beams subjected to transverse oscillations. An extension of the theory to an elastic column sustaining a load is given in the Appendix.