Excerpt from Earthquakes and Other Earth Movements To a. Geologist there are perhaps no phenomena in nature more interesting than earthquakes, the study of which is called Seismology. Coming, as shocks often will, from a region of volcanoes, the study of these disturbances may enable us to understand something about the nature and working of a volcano. As an earthquake-wave travels along from strata to strata, if we study its reflections and changing velocity in transit, we may often be led to the discovery of certain rocky structures buried deep beneath our View, about which, without the help of such waves, it would be hopeless ever to attain any knowledge. By studying the propagation of earthquake-waves the physicist is enabled to confirm his speculations respecting the transmission of disturbances in elastic media. For the physicist earthquakes are gigantic experiments which tell him the elastic moduli Of rocks as they exist in nature, and when properly interpreted may lead him to the proper comprehension of many ill-understood pheno mena. It is not impossible that seismological investiga tion may teach us something about the earth's magnetism, and the connection between earthquakes and the earth currents which appear in our telegraph wires. These and numerous other kindred problems fall within the domain of the physicist. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.