Source phase shift - A new phenomenon in wave propagation due to anelasticity

Details Source phase shift - A new phenomenon in wave propagation due to anelasticity Source phase shift - A new phenomenon in wave propagation due to anelasticity

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..569b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 12, Sept. 1985, p. 569-572.

Physics

3

Anelasticity, Free Vibration, Geomorphology, Mathematical Models, Vibration Mode, Wave Propagation, Dirac Equation, Earth Movements, Perturbation Theory, Phase Shift, Toroids

Scientific paper

The free oscillations of an anelastic earth model due to earthquakes were calculated directly by means of the correspondence principle from wave propagation theory. The formulation made it possible to find the source phase which is not predictable using first order perturbation theory. The predicted source phase was largest for toroidal modes with source components proportional to the radial strain scalar instead of the radial displacement scalar. The source phase increased in relation to the overtone number. In addition, large relative differences were found in the excitation modulus and the phase when the elastic excitation was small. The effect was sufficient to bias estimates of source properties and elastic structure.

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