A STUDY OF PS CONVERTED WAVES

Abstract
The purpose of this investigation was to make a detailed study of the fundamental properties of PS converted waves to ascertain whether they can be detected consistently on seismograms from both underground nuclear explosions and earthquakes and whether they can be used to help distinguish underground nuclear explosions from earthquakes. The study included: (a) Theoretical considerations of the amplitudes of PS and other converted waves as compared to observed amplitudes. (b) Harmonic analysis of seismograms to aid in the interpretation. (c) Analysis of seismograms of underground nuclear explosions and large, distant earthquakes recorded at the University of Utah seismograph stations and other selected stations to develop dependable criteria for recognition of PS converted waves on seismograms. (d) The analysis of selected seismograms from underground nuclear explosions for recognition of PS converted waves recorded by vertical- and horizontal-component seismometers at the Geotech field stations.

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