SCATTERING OF ELASTIC-WAVES BY A SPHERICAL INCLUSION .1. THEORY AND NUMERICAL RESULTS

Citation
Va. Korneev et Lr. Johnson, SCATTERING OF ELASTIC-WAVES BY A SPHERICAL INCLUSION .1. THEORY AND NUMERICAL RESULTS, Geophysical journal international, 115(1), 1993, pp. 230-250
Citations number
37
Categorie Soggetti
Geosciences, Interdisciplinary
ISSN journal
0956540X
Volume
115
Issue
1
Year of publication
1993
Pages
230 - 250
Database
ISI
SICI code
0956-540X(1993)115:1<230:SOEBAS>2.0.ZU;2-O
Abstract
A complete and exact solution for the problem of an incident P wave sc attered by an elastic spherical inclusion is presented and described. The solution can be obtained from either analytical formulae or stable numerical procedures. A method of estimating the number of terms that must be retained in the harmonic series in order to achieve a specifi ed accuracy is given. The results are investigated by calculating synt hetic seismograms, scattering diagrams, and scattering cross-sections for a broad frequency band and for both low-velocity and high-velocity inclusions. The fields within the shadow zone are formed primarily fr om three different types of waves, P waves transmitted through the sph ere, P waves diffracted around the sphere, and S waves converted at th e boundary of the sphere. The relative contribution from these differe nt waves depends upon the distance of the observation point from the s phere.