Extensive-Dilatancy Anisotropy (Eda) Inferred From Observations of Crustal Shear Waves Generated By A Refraction Experiment In Northern Scandinavia |
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| Authors: | S G Brooks P N Chroston D C Booth |
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| Institution: | School of Environment Sciences, University of East Anglia, Norwich NR4 7TJ.;British Geological Survey, West Mains Road, Edinburgh EH9 3LA, Scotland. |
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| Abstract: | Summary. Particle-motion plots of shear waves have been studied for the section FG of the FENNOLORA seismic experiment. Shear-wave splitting is observed on some records and the polarization of the first arriving shear waves show two peaks at about N35°W and N65°E. These results can be interpreted as being due to crack-induced anisotropy with the crack direction dominated by a (dominant) horizontal stress around N35°W. This is consistent with in situ stress measurements and focal mechanism studies in Scandinavia. the results show that seismic refraction experiments may be useful in providing evidence of crack-induced anisotropy in the stable continental crust. |
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| Keywords: | shear waves anisotropy refraction Scandinavia |
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