Teleseismic shear wave splitting measurements in noisyenvironments

Details Teleseismic shear wave splitting measurements in noisyenvironments Teleseismic shear wave splitting measurements in noisyenvironments

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999geoji.137..821r&link_type=abstract

Geophysical Journal International, Volume 137, Issue 3, pp. 821-830.

Astronomy and Astrophysics

Astronomy

14

Anisotropy, Shear Wave Splitting

Scientific paper

High noise levels hamper teleseismic shear wave splitting measurements, which bandpass filtering does not always help. To investigate how robust splitting measurements are to noise, we analysed a set of synthetic records with known splitting parameters and added fixed levels of noise. In the presence of weak anisotropy, single-waveform splitting measurements are unreliable when operating with noisy data sets. A practical rule in terms of S/N ratio and splitting delay time parameters is that splitting is confidently detectable at S/N>8, regardless of the wave's original polarization orientation. However, for the evidence of weak anisotropy to be detectable and measurable at an S/N value of 4, the backazimuth separation of the phases from the fast polarization direction needs to be higher than 20 deg. Stacks of individual measurements consistently yield reliable results down to S/N values of 4. Applying stacking to data from DSB (Dublin, Ireland), the fast polarization direction phi and lag time deltat are 58 deg and 0.95 s. This orientation reflects surface trends of deformation in the area, as found elsewhere in the UK. Our result thus reinforces the proposed model that the detected anisotropy in the British Isles originates from lithospheric coherent deformation preserved from the last main tectonic episode.

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