Contribution to the Study of Deep Focus Earthquakes

In the following pages are presented certain rapid and convenient methods for interpreting the records of deep-focus earthquakes. These methods are in regular use at Pasadena, and furnish the basis for the discussion of new phases in the preceding paper. The procedure is by no means in a final state; it is offered here in justification of the preceding results, and as a contribution to the rapidly developing theory of these interesting shocks.