Seismic Anisotropy in the Earth - Couverture rigide

Babuska, V.; Cara, M

Couverture rigide

ISBN 10 : 0792313216 ISBN 13 : 9780792313212

Editeur : Kluwer Academic Publishers, 1991

Synopsis

Structural geologists are well aware of the fact that isotropic rocks are quite exceptional in nature. Whicheverorigin, sedimentary, metamorphicormagmatic, rocks are shaped with a plane of mineral flattening, the foliation in geologists' jargon, and with a line ofmineral elongation, the lineation. Just like a good quarryman, a trained structural geologistwill detectapreferredorientationin an apparently isotropic granite. Preferred mineral orientation and thus structural anisotropy are the rule in nature. Consideringthe largevariationsinelasticcoefficientsofrock-forming minerals, itcould be predicted that, in turn, seismic anisotropy should exist and be important, provided thatdomains withasimilarstructural signatureare largeenough to affectseismic waves. This is why, in 1982 at a conference held in Frankfurt, which was oneofthe fIrst meetings devoted to the subject of seismic anisotropy, I asked Don Anderson the question of why seismologists had not considered earlier in their models the obvious constraint of anisotropy. I still remember Don's answer: "Adolphe, we knew that our isotropic models were not very good but we had no other choice. It is simply that, so far, computerswere not largeenough tointegrate the anisotropy parameter". Changingisotropic glassesfor anisotropic ones permits us to obtain betterand more realistic seismic modelsofthe Earth's interior, but, maybe more importantly, it has, for a seismologist, the farreaching consequenceofsteppinginto the fIeld ofgeodynamics.

Détails de l'édition

• Éditeur: Kluwer Academic Publishers
• Date d'édition: 1991
• Langue: anglais
• ISBN 10: 0792313216
• ISBN 13: 9780792313212
• Reliure: Relié
• Nombre de pages: 219
• Coordonnées du fabricant: Springer; https://www.springer.com/gp; ; Friedrich-Karl-Str. 9; Hamburg; 22391; Allemagne