Bootstrapping shear-wave splitting errors

1994 ◽  
Vol 84 (6) ◽  
pp. 1971-1977 ◽  
Author(s):  
Eric Sandvol ◽  
Thomas Hearn
Keyword(s):  
Shear Wave ◽  
Error Estimation ◽  
Bootstrap Method ◽  
Estimation Method ◽  
Simulated Data ◽  
Shear Wave Splitting ◽  
Model Parameters ◽  
Nonlinear Inversion ◽  
Correlated Errors ◽  
Wave Splitting

Abstract We have developed a bootstrap method to estimate errors associated with inverting SKS waveforms for shear-wave splitting parameters. Although presented for shear-wave splitting inversions, this method is suitable for any waveform inversion procedure. The bootstrap error estimation method consists of multiple inversions of simulated data that imitate the original data with differing noise sequences. The results of the bootstrap inversions are used to directly calculate variances and covariances for all model parameters. We employ a bootstrap error estimation technique to nonlinear inversion for shear-wave splitting parameters. Since seismic data have correlated errors, the bootstrap method was modified for stationary bandlimited time series. This modified bootstrap method was applied to shear-wave splitting measurements from over 60 pairs of horizontal seismograms. The method is stable under a large range of noise conditions. By using this bootstrap method, we can distinguish among data with no apparent splitting, data with splitting, and noisy data.

scholarly journals Shear-wave splitting around the Eifel hotspot: evidence for a mantle upwelling

2005 ◽  
Vol 163 (3) ◽  
pp. 962-980 ◽  
Author(s):  
K. T. Walker ◽  
G. H. R. Bokelmann ◽  
S. L. Klemperer ◽  
G. Bock
Keyword(s):  
Shear Wave ◽  
Shear Wave Splitting ◽  
Model Parameters ◽  
Eurasian Plate ◽  
Mantle Upwelling ◽  
Data Set ◽  
First Order ◽  
Crustal Stresses ◽  
Short Period ◽  
Wave Splitting

Summary We present the results of a shear-wave splitting analysis across the Eifel hotspot in west-central Europe. Our data set includes 18 permanent European broadband stations and 102 temporary Eifel broadband and short-period stations. We observe variations in splitting at most permanent stations, but are not able to model them reliably with unique dipping-axis or two-layer anisotropy models. We prefer instead a single-layer model with a horizontal fast axis to approximate the first-order anisotropy, which varies smoothly between stations. We observe a first-order parabolic pattern in fast polarization azimuth around the hotspot, which suggests that a lattice preferred orientation (LPO) of olivine fast axes exists in the asthenosphere as a result of the interaction between the slowly WSW-moving Eurasian plate and a mantle upwelling beneath the Eifel volcanic fields. The minority of the variation not explained by this model correlates with rapid lateral changes in splitting, and is interpreted as a result of additional anisotropy and/or the effects of dynamic recrystallization associated with LPO development in the region of corner flow near the conduit. Our parabolic asthenospheric flow (PAF) interpretation is consistent with Eifel geological, tomographic, receiver function, global absolute plate motion, electrical conductivity anisotropy, and geochemical studies, as well as with splitting studies in the Great Basin and around Hawaii.We suggest that the Eifel upwelling is sporadic, and a result of a low excess upwelling temperature and/or varying crustal stresses that periodically shift and facilitate eruption. The PAF pattern we observe neither suggests nor rules out anisotropy in the conduit associated with a wet Eifel upwelling.We use our optimum PAF model parameters to calculate a Eurasian plate speed of 12 km Ma−1, which is consistent with the recent HS3-NUVEL1A speed of 19 ± 14 km Ma−1.

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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