Earthquake Vibrations

Abstract

IN a note in your issue of August 25 on my account of the earthquake of March 8, 1881, felt in Japan, it is said “that from the phenomena of the shock and from experiments on artificial earthquake waves produced by letting an iron ball weighing about one ton fall from a height of about thirty-five feet, Mr. Milne agrees that the waves that are felt are transverse to the line of propagation of the shock.” Lest it should be thought that all the earthquakes which shake the residents in Japan are composed of transverse vibrations, allow me to make the following brief statements:—