V. Babuska; M Cara Seismic Anisotropy in the Earth 9789401055963

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Автор: V. Babuska; M Cara
Название: Seismic Anisotropy in the Earth
ISBN: 9789401055963
Издательство: Springer
Классификация:

Прикладная физика и специальные темы

Геофизика

Геология и литосфера

Экономическая геология

Земля: общая естественная история

ISBN-10: 9401055963
Обложка/Формат: Soft cover
Страницы: 219
Вес: 0.36 кг.
Дата издания: 05.11.2012
Серия: Modern Approaches in Geophysics
Язык: English
Издание: Softcover reprint of
Иллюстрации: Biography
Размер: 156 x 235 x 19
Читательская аудитория: General (us: trade)
Основная тема: Geophysics/Geodesy
Ссылка на Издательство: Link
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Поставляется из: Германии
Описание: 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 Dons 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 Earths interior, but, maybe more importantly, it has, for a seismologist, the farreaching consequenceofsteppinginto the fIeld ofgeodynamics.

Seismic Anisotropy in the Earth, V. Babuska; M Cara