Materials for the study of deep-focus earthquakes (Second Paper)

The present paper is supplementary to a previous publication under the same title, for which a list of errata is here given. The first paper has been translated into French by Professor E. Rothé, and is to be published by the Bureau Central Séismologique International. (The French publication will contain a travel-time chart for focal depth 600 km. in place of that for 400 km. given in the English paper.) At the request of Professor Rothé a more detailed account of the calculation of certain travel times was drawn up, which he has also translated, and which will appear as an additional note in the French publication. This additional note is given in English in the present paper. To this are added a new table (table 1, pp. 161-165 below) giving epicentral distance as a function of the travel time of P and of the focal depth, and a further discussion of methods for locating the epicenters of deep shocks.