Thin layers and shear‐wave splitting

1991 ◽  
Author(s):  
R. D. Slack ◽  
D. A. Ebrom ◽  
J. A. McDonald ◽  
R. H. Tatham
Keyword(s):  
Shear Wave ◽  
Shear Wave Splitting ◽  
Thin Layers ◽  
Wave Splitting

Thin layers and shear‐wave splitting

Geophysics ◽  
1993 ◽  
Vol 58 (10) ◽  
pp. 1468-1480 ◽  
Author(s):  
Richard D. Slack ◽  
Daniel A. Ebrom ◽  
John A. McDonald ◽  
Robert H. Tatham
Keyword(s):  
Time Delay ◽  
Shear Wave ◽  
Shear Wave Splitting ◽  
Dominant Frequency ◽  
Azimuthal Anisotropy ◽  
Thin Layers ◽  
Anisotropic Layer ◽  
Near Surface ◽  
Wave Signal ◽  
Wave Splitting

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 of this layer approaches some physically defined limit, however, a previous layer’s anisotropic signature is completely overwritten. Hodograms and Alford rotations are typically used to analyze shear‐wave splitting in the presence of azimuthal anisotropy. When the time‐delay generated by an azimuthally anisotropic layer is ⩾τ/8, where τ = one period of the wavelet’s dominant frequency, distortion of a shear‐wave signal is great enough to degrade the accuracy of the interpretation in hodogram analysis. We found that Alford rotations are superior to visual hodogram analysis when the time delay between the fast and slow shear‐waves is less than τ/8. When two azimuthally anisotropic layers with different symmetry axes exist, however, interpretations generated through both hodogram analysis and Alford rotations begin to deteriorate when the time‐delay generated by the second layer is ⩾τ/8. Recent field work has shown that the weathering layer may possess differential shear‐wave birefringence in excess of 25 percent. If we assume a dominant frequency of 40 Hz and shear‐wave velocities of [Formula: see text] and [Formula: see text], then an azimuthally anisotropic weathering layer may be as little as 5.8 m (19 ft) thick when it begins to overwrite a previous layer’s anisotropic response. When the time delay generated by a second anisotropic layer is ⩾τ (46.4 m, 152 ft thick), information about earlier anisotropic events are completely overwritten.

scholarly journals Insight into NE Tibetan Plateau expansion from crustal and upper mantle anisotropy revealed by shear-wave splitting

2017 ◽  
Vol 478 ◽  
pp. 66-75 ◽  
Author(s):  
Zhouchuan Huang ◽  
Frederik Tilmann ◽  
Mingjie Xu ◽  
Liangshu Wang ◽  
Zhifeng Ding ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Shear Wave ◽  
Upper Mantle ◽  
Shear Wave Splitting ◽  
Upper Mantle Anisotropy ◽  
Wave Splitting ◽  
Mantle Anisotropy ◽  
Insight Into ◽  
Ne Tibetan Plateau

Analysis of shear wave splitting anisotropy in the Tres Virgenes Volcanic Complex, Baja California Sur, Mexico

Geothermics ◽  
2021 ◽  
Vol 94 ◽  
pp. 102115
Author(s):  
F. Chacón-Hernández ◽  
F.R. Zúñiga ◽  
J.O. Campos-Enríquez ◽  
J. Lermo-Samaniego ◽  
N. Jiménez-Méndez
Keyword(s):  
Shear Wave ◽  
Baja California ◽  
Shear Wave Splitting ◽  
Volcanic Complex ◽  
Baja California Sur ◽  
Wave Splitting

Effects of oil‐water saturation on shear‐wave splitting in multicomponent seismic data

2007 ◽  
Author(s):  
Zhongping Qian ◽  
Xiang‐Yang Li ◽  
Mark Chapman ◽  
Yonggang Zhang ◽  
Yanguang Wang
Keyword(s):  
Shear Wave ◽  
Seismic Data ◽  
Water Saturation ◽  
Shear Wave Splitting ◽  
Multicomponent Seismic ◽  
Wave Splitting ◽  
Oil Water

scholarly journals Variations in lithospheric anisotropy across the North Anatolian Fault revealed by teleseismic shear wave splitting

2021 ◽  
Author(s):  
David Cornwell ◽  
Sebastian Rost ◽  
David A Thompson ◽  
Gregory A. Houseman ◽  
Lisa A Millar ◽  
...  
Keyword(s):  
Shear Wave ◽  
Shear Wave Splitting ◽  
North Anatolian Fault ◽  
The North ◽  
Wave Splitting

scholarly journals Shear wave splitting in a young continent-continent collision: An example from Eastern Turkey

2003 ◽  
Vol 30 (24) ◽  
Author(s):  
Eric Sandvol ◽  
Niyazi Turkelli ◽  
Ekrem Zor ◽  
Rengin Gok ◽  
Tolga Bekler ◽  
...  
Keyword(s):  
Shear Wave ◽  
Shear Wave Splitting ◽  
Eastern Turkey ◽  
Wave Splitting
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