Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...78..281b&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 78, Issue 3-4, p. 281-300.
Physics
57
Scientific paper
The seismic (elastic) properties of the crust have been modelled using hypothetical polycrystals with typical crustal compositions and commonly measured petrofabrics. This modelling allows us to better evaluate and quantify the crustal contribution to splitting of teleseismic SKS-waves. Mafic rocks such as anorthosite or pyroxene-bearing gabbros have complex S-waves properties, i.e. with small shear-wave anisotropies (< 3%) and without clear relationships between the fast shear-wave polarization plane orientations and the fabric. On the other hand foliated felsic rocks such as gneisses or schists and mafic rocks such as amphibole-bearing gabbros are strongly birefringent (anisotropies greater than 5%) and exhibit clear relationships with the structure. Biotite and amphibole preferred orientations clearly play a major role in shear-wave splitting in crustal rocks. We show strong correlations between the orientation of the foliation and the amplitude of the delay time. Maximum delay time is systematically observed for waves propagating parallel to the foliation. The fast shear-wave is furthermore polarized parallel to the foliation plane. We calculate a delay time of about 0.1-0.2 s per 10 km of crustal rocks.
Barruol Guilhem
Mainprice David
No associations
LandOfFree
A quantitative evaluation of the contribution of crustal rocks to the shear-wave splitting of teleseismic SKS waves does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A quantitative evaluation of the contribution of crustal rocks to the shear-wave splitting of teleseismic SKS waves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A quantitative evaluation of the contribution of crustal rocks to the shear-wave splitting of teleseismic SKS waves will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1074231