Seismic anisotropy of the crystalline crust: what does it tell us?
作者:
Wolfgang Rabbel,
Walter D. Mooney,
期刊:
Terra Nova
(WILEY Available online 1996)
卷期:
Volume 8,
issue 1
页码: 16-21
ISSN:0954-4879
年代: 1996
DOI:10.1111/j.1365-3121.1996.tb00721.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
ABSTRACTThe study of the directional dependence of seismic velocities (seismic anisotropy) promises more refined insight into mineral composition and physical properties of the crystalline crust than conventional deep seismic refraction or reflection profiles providing average values of P‐and S‐wave velocities. The alignment of specific minerals by ductile rock deformation, for instance, causes specific types of seismic anisotropy which can be identified by appropriate field measurements.Vice versa, the determination of anisotropy can help to discriminate between different rock candidates in the deep crust. Seismic field measurements at the Continental Deep Drilling Site (KTB, S Germany) are shown as an example that anisotropy has to be considered in crustal studies. At the KTB, the dependence of seismic velocity on the direction of wave propagationin situwas found to be compatible with the texture, composition and fracture density of drilled crustal ro
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