Results 241 to 250 of about 1,946,673 (274)
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Thin layers and shear-wave splitting
Geophysics, 1991Abstract The near-surface weathering layer is considered by many to be strongly anisotropic. Any shear-wave signal passing through this low-velocity layer will inherit, to some degree, the anisotropic response of this layer. For thin weathering layers, information about previous anisotropic events may be distorted; when the thickness ...
R. D. Slack +3 more
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Null Detection in Shear-Wave Splitting Measurements
Bulletin of the Seismological Society of America, 2007Shear-wave splitting measurements are widely used to analyze orien- tations of anisotropy. We compare two different shear-wave splitting techniques, which are generally assumed to give similar results. Using a synthetic test, which covers the whole backazimuthal range, we find characteristic differences, however, in fast-axis and delay-time estimates ...
Wüstefeld, A, Bokelmann, G
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A New Understanding of Shear-Wave Splitting
Proceedings, 1995Shear-wave splitting (shear-wave- bi-refringence) diagnostic of some form of azimuthal anisotropy is widely observed in all types of rock in the uppermost 15km of the Earth's crust (Crampin and Lovell 1991).
S. Crampin, S. V. Zatsepin
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Making Reliable Shear-Wave Splitting Measurements
Bulletin of the Seismological Society of America, 2013Shear-wave splitting (SWS) analysis using SKS, SKKS, and PKS (here- after collectively called XKS) phases is one of the most commonly used techniques in structural seismology. In spite of the apparent simplicity in performing SWS measure- ments, large discrepancies in published SWS parameters (fast direction and splitting time) suggest that a ...
K. H. Liu, S. S. Gao
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Shear wave splitting and subcontinental mantle deformation
Journal of Geophysical Research: Solid Earth, 1991We have made measurements of shear wave splitting in the phases SKS and SKKS at 21 broadband stations in North America, South America, Europe, Asia, and Africa. Measurements are made using a retrieval scheme that yields the azimuth of the fast polarization direction ϕ and delay time δt of the split shear wave plus uncertainties.
Paul G. Silver, W. Winston Chan
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A physical model study of shear wave splitting and fracture intensity
SEG Technical Program Expanded Abstracts 1987, 1987Abstract In a series of physical model experiments, fractured media are simulated by stacks of thin Plexiglas sheets clamped together tightly to form blocks. The plates are assembled underwater, and a very thin water layer between the sheets prevents formation of an effectively welded interface between them. Thus, the stacked material
Robert H. Tatham +4 more
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Implications of temporal changes in shear‐wave splitting
SEG Technical Program Expanded Abstracts 1988, 1988Details of the behaviour of shear-wave splitting have been observed to change before and after earthquakes and before and after hydraulic fracturing. The observations before earthquakes can be interpreted as the increasing aspect ratio (dilatation) of stress-aligned EDA-cracks, and the return to thin cracks after the earthquake has released the stress.
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Analysis of Shear-Wave Splitting
66th EAGE Conference & Exhibition, 2004K. Henneberg, J. Langhammer, T. Tvedt
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Shear-wave splitting in the Rajasthan craton, India
Journal of Asian Earth Sciences, 2019Abstract The shear-wave splitting parameters (i.e. fast axes orientation (ψ) and delay time (δt)) are measured at four broadband stations in Rajasthan, using SKS/SKKS core phases from three-component broadband waveforms of 30 events recorded during 2014–16.
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Shear-wave splitting in a critical crust
Journal of Applied Geophysics, 2003Stuart Crampin +2 more
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