Seismic waves from non-double-couple sources

Singh, Sarva Jit ; Ben-Menahem, Ari (1988) Seismic waves from non-double-couple sources Physics of the Earth and Planetary Interiors, 50 (3). pp. 272-279. ISSN 0031-9201

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The displacement field due to an arbitrary point source is obtained in terms of the nine spherical components of the moment tensor. It is shown that the far-field is not affected by the lack of symmetry of the moment tensor or the value of its trace. However, in the near-field, M↔ tr shows up in the radial component of the displacement and the antisymmetric part of M↔ appears in the transverse component of the displacement. Assuming M↔ to be symmetric and traceless, the moment tensor is split into two parts, one representing a double-couple and the other a compensated linear-vector dipole (CLVD). The displacement fields due to the two sources are obtained in terms of five parameters, namely the strike, dip and slip angles of the double-couple, the strength of the double-couple and the relative strength of the CLVD. These five parameters match exactly with the five degrees of freedom in which the components of M↔ can be specified and, therefore, are suitable for inversion purposes. It is shown how the first motion observations of P waves can be used to calculate the relative strength of the CLVD. The Cartesian components of the moment tensor obtained for the double-couple and the CLVD can be used to calculate the relative excitation of surface waves by these sources.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:82150
Deposited On:09 Feb 2012 12:45
Last Modified:15 Feb 2012 05:08

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