Various methods have been devised for determining the nature of the forces which give rise to the seismic wave motions. To determine the direction of motion along the fault-plane, the direct computational technique to be proposed in this paper is an analytical modification of Adams' technique (1958) by means of determinants. This paper is concerned with the derivation of equations for computing the direction cosines of the “direction of motion” for a type I source, i.e., a couple of two equal and opposite forces with moment acting at the focus of the earthquake.

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