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Concerning Baseline Errors in the Form of Acceleration Transients When Recovering Displacements from Strong Motion Records Using the Undecimated Wavelet Transform

This paper is a significant progression on Chanerley and Alexander’s (2010) paper. It finds that the integration errors are Dirac-like, acceleration transients (‘spikes’), which occur towards the end of the strong-motion, low-frequency, acceleration fling-pulse after application of the un-decimated wavelet transform. The cause of the error is due to ground rotations and torsions. The findings are supported by the results obtained from the Iceland and New Zealand events in 2008 and 2010 respectively. The results from the Icelandic, small aperture array (ICEARRAY) are particularly significant results and show a high degree of correlation for the 11-instruments giving specific experimental support.