Abstract
The time-averaged cross-product of vertical and radial components
of ground motion is multiplied by the original signal producing a
function of ground motion in which rectilinearly polarized motion
is enhanced. This provides some separation of seismic signals from
noise when both occupy the same frequency and velocity bands. The
vertical and radial motion is decomposed into its Fourier components,
and the parameters of an equivalent ellipse are computed at each
instant of time. The eccentricity, major axis, and angle of inclination
of the ellipse provide criteria for identifying P and SV waves of
different velocities.
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