Complex deep seismic anisotropy below the Scandinavian Mountains

Roy, C.; Ritter, Joachim

doi:10.1007/s10950-012-9325-4

Cited by 5 publications

(3 citation statements)

References 52 publications

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“…In increasing backazimuth order, these source regions are: Fiji Islands, Vanuatu, Mariana Islands, Banda Sea, Java, Southern Peru, Peru-Brazil border and Santiago/Chile (Table 1). This source distribution for SIMW contains two additional backazimuth directions compared to the earlier work of Roy & Ritter (2013). Additionally, more stable splitting results were determined at six out of seven NOA sites, where none were available before.…”

Section: Simw Results For Noamentioning

confidence: 99%

“…The splitting parameters from the previous study (Roy & Ritter 2013) and the SIMW method are compared in Fig. 7.…”

Section: Simw Results For Noamentioning

confidence: 99%

“…Wolfe & Silver (1998) stacked contour plots of the minimum eigenvalue of the corrected matrix of the particle motion. Roy & Ritter (2013) stacked SKS recordings at three neighbouring sites in a gliding window along a station profile in Norway and Sweden to stabilize the splitting analysis. Such an approach is only valid, if the anisotropic structure underneath the different stations is nearly identical and a common Fresnel zone is covered by only slightly different recording geometries.…”

Section: Stacking Techniques For Sksmentioning

confidence: 99%

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On the improvement of SKS splitting measurements by the Simultaneous Inversion of Multiple Waveforms (SIMW)

et al. 2016

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The birefringence of core-refracted shear waves (e.g. SKS or SKKS) is often used to study seismic anisotropy in the Earth. However, depth resolution and multilayer anisotropy is generally poor for many regions on Earth. This is primarily due to SKS or SKKS phases that are not observable for different backazimuths either because of missing seismicity at the required distance range or because of a too low signal-to-noise ratio (SNR). We propose a new method called Simultaneous Inversion of Multiple Waveforms (SIMW), which allows the joint inversion of multiple core-refracted shear waves from different earthquakes within the same source region, observed by either the same seismic station or by a seismic network. The waveforms are concatenated into a combined signal, which is then inverted with the Silver & Chan method to determine the two splitting parameters: time delay δt, and fast polarization direction. We apply our method to recordings at the large aperture Norwegian NORSAR Array and the German Gräfenberg array (GRF). Our results demonstrate that SIMW allows a stable determination of splitting results for low-amplitude or noisy SKS signals. Splitting parameter uncertainties can be reduced and reliable results are obtained for both arrays. Moreover, new backazimuth directions can be explored, enabling a more accurate derivation of two-layer anisotropy models. Our new methodology is particularly helpful for temporary station deployments with limited recording times in order to utilize as many as possible signals including such with low-amplitude and small SNR.

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Section: Simw Results For Noamentioning

confidence: 99%

“…The splitting parameters from the previous study (Roy & Ritter 2013) and the SIMW method are compared in Fig. 7.…”

Section: Simw Results For Noamentioning

confidence: 99%