First-order corrections to the radiation patterns of P-and S-waves in a prestressed medium |
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| Authors: | M Bonafede E Boschi F Mulargia R Sabadini |
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| Institution: | Istituto di Geofisica, Via Irnerio 46, 40126 Bologna, Italy |
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| Abstract: | Summary. The long wavelength radiation patterns of P - and S -waves are determined for an elastic prestressed earth model. The prestress is treated as a perturbation of an isotropic medium. Non-zero first-order corrections are found to the eigenvalues and eigenvectors of the deviatoric seismic moment tensor. The radiation pattern given by a purely tangential dislocation is equivalent to a double couple contaminated by a dipolar term linear in the perturbation. |
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