SEISMIC GYROTROPY AND ITS PHYSICAL REASONS
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dc.contributor.author | Obolentseva I.R. | |
dc.contributor.author | Chichinina T.I. | |
dc.date.accessioned | 2020-12-24T03:44:14Z | |
dc.date.available | 2020-12-24T03:44:14Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=14995383 | |
dc.identifier.citation | Geologiya i geofizika, 1997, , 5, 999-1013 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/21298 | |
dc.description.abstract | A new concept, seismic gyrotropy, is presented in the context of both phenomenological and microlevel theory; comparison with the advanced theory of optical gyrotropy is given. Seismic gyrotropy is introduced as manifestation of spatial dispersion of elastic properties in a first approximation. Hooke's law (a material equation connecting stresses with strains) is used with additional terms proportional to strain derivatives; the factors of proportionality are components of the gyration tensor b, the tensor of fifth rank, invariant with respect to a group of rotations. The tensor b is given for following acenrtic groups of symmetry: ∞∞, ∞, ∞2, ∞m, 222, 2mm, 2, m; geological media with gyrotropic properties may belong to these groups. Using a medium of group symmetry ∞∞, it is shown that enantiomorphous media are «rotating». For «rotating» media, the nature of structure dissymetry on microlevel is found: microobjects of such media are situated in 3D-space accordingly to the principle translation plus azimuthal turn. Three types of micromodels for geological media are put forward which are constructed on this principle; these are models for sandy rocks, rocks with scattering inclusions and thin-layered media. As for the model of sandy rocks, numerical estimates of specific rotation are given, obtained by numerical simulation. | |
dc.title | SEISMIC GYROTROPY AND ITS PHYSICAL REASONS | |
dc.type | Статья |
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