Shear‐coupled PL

Abstract

Summary. Observed teleseismic shear‐coupled PL‐waves (SPL) display a variety of waveforms depending on factors such as source depth, source type and velocity structure. Using a WKBJ spectral method for SV‐wave propagation, synthetic seismograms of SPL are produced to examine the factors important in SV and SPL excitation. Results show that SPL is preferentially excited by shallow sources compared to deep sources. This is due to large source area reverberations which consequently leak as SV‐waves into the mantle. Interaction at the receiver area then sets up the classic prograde elliptical motion by which SPL can be identified. This is in accordance with the teleseismic observations and indicates that most previous models for the propagation of SPL were not appropriate for shallow source since emphasis was placed on wave interactions occurring only near the receiver. Copyright © 1985, Wiley Blackwell. All rights reserved

Publication Title

Geophysical Journal of the Royal Astronomical Society

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