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The determination of S-wave polarization angles for an earth model with crustal layering

INSTITUTE OF TECHNOLOGY SAINT LOUIS UNIVERSITY, ST. LOUIS, MISSOURI

Abstract

This paper presents a method for determining the polarization angle of S waves which takes account of the crustal layering at the seismograph station. Charts are given for four crustal models, corresponding to normal continental, thick, and thin crusts, which enable one to obtain the polarization angle at the top of the mantle beneath the seismograph station.

The equations to be used for obtaining the polarization angle are

w_here is t_he polarization angle, is t_he angle between t_he _horizontal component of t_he S-wave surface motion and t_he great circle pat_h at t_he station, is t_he angle between t_he vertical axis and t_he component of t_he S-wave surface motion in t_he plane transverse to t_he great circle pat_h, and F_h and F_v are functions of wave period, epicentral distance, and t_he crustal structure at t_he seismograp_h station. Values of F_h and F_v for four crustal models are given in t_he paper.

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