Null Detection in Shear-Wave Splitting Measurements

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SplitLab: A shear-wave splitting environment in Matlab (2008, methodology): “As demonstrated by Wüstefeld and Bokelmann (2007), a useful application of the RC method is for distinguishing true nulls from small delay times in the case of noisy records.”
Shear Wave Splitting and Mantle Anisotropy: Measurements, Interpretations, and New Directions (2009, methodology): “…with different methods provide increased confidence in the findings, while discrepancies are a red flag that the measurements must be examined with great care, as they may be diagnostic of complex anisotropy (Long and van der Hilst 2005b) or of near-null splitting (Wüstefeld and Bokelmann 2007).”
Identifying global seismic anisotropy patterns by correlating shear-wave splitting and surface-wave data (2009, background): “Null measurements, though important to constrain fast directions at individual stations (Wüstefeld and Bokelmann, 2007), are not taken into account.”