seismic anisotropy


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seismic anisotropy

[′sīz·mik ‚an·ə′sä·trə·pē]
(geophysics)
The dependence of seismic velocity on the direction of propagation.
References in periodicals archive ?
This calibration usually involves seismic anisotropy of shale deposits (e.
Seismic anisotropy is one of the most important properties characterizing the stress condition in the oceanic asthenosphere.
The measurement of seismic anisotropy (the variation of seismic wave speed with direction) using the method of shear wave splitting (SWS) has been used to monitor variations in stress in industry but is generally only available in hindsight to studies of volcanoes and earthquakes.
Estimates of lithospheric thickness range up to 300 km, and shear wave analyses indicate east-west seismic anisotropy (Musacchio et al.
Now, Barbara Romanowicz, a geophysicist at the University of California, Berkeley, and her colleagues contend that some of those seismic-wave studies missed an important factor known as seismic anisotropy, a phenomenon in which some earthquake waves travel more quickly than others.
It was revealed that seismic anisotropy is strongly related to foliation and is, in particular, an important property of the biotite gneisses, which dominate the upper and lower gneiss series.
3,39) It is therefore strongly suggested that the texture developed in PPv by plastic shear deformation can be responsible for the seismic anisotropy observed in the D" layer.
The existence of relationship between crack and seismic anisotropy allowed to use seismic methods for determining orientation of fracture systems and the crack density in sites where the rocks are inaccessible to direct observation.
1993, Seismic anisotropy of metapelites from the Ivrea-Verbano zone and Serie dei Laghi (nothern Italy).