Abstract
The paper (published in full in Bull. Seis. Soc Amer., v. 19, 63–76, 1929) deals with methods of interpreting instrumental records of seismic surface‐waves to determine the velocities of the several wave‐groups. Current methods of identifying surface‐waves depend upon characteristics of period and amplitude only and generally no attempt is made to distinguish between the two major types of surface‐wave motion, namely. (1) Transverse motion of Love wave‐type and (2) motion of Rayleigh wave‐type in which the motion of the horizontal component is in the line of propagation. The key to the methods of identifying wave‐types lies in determining from the grams the motion of the earth‐particle by practical methods. The three methods discussed depend upon (1) the ratio of instantaneous amplitudes on the two horizontal components, (2) phase‐relationships between instantaneous displacements on the two components, and (3) transformation of the observed motion to a new system of coordinates which are rectilinear with respect to the direction of propagation.
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