Katrin Beyer, Julian J. Bommer; Relationships between Median Values and between Aleatory Variabilities for Different Definitions of the Horizontal Component of Motion. Bulletin of the Seismological Society of America ; 97 (5): 1769. doi: https://doi.org/10.1785/0120070128
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In Beyer and Bommer (2006), the definition of MaxD in Table 1 (page 1515) was printed incorrectly. The definition should read as follows:...
MaxD: At each period the maximum spectral ordinate from all possible orientations of the horizontal axis system is determined. MaxD is hence defined as the 100th percentile of the spectral ordinates obtained.