Orientation-independent, nongeometric-mean measures of seismic intensity from two horizontal components of motion

By D. Boore. 2010

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Site condition evaluation using horizontal-to-vertical response spectral ratios of earthquakes in the NGA-West 2 and Japanese databases (2014, background): “edu; last accessed June 2014) contains the average horizontal component defined by the median rotated direction RotD50 [11] and the vertical component of 5%-damped elastic pseudo-absolute acceleration response spectral ordinates (PSA) at 111 periods ranging from 0.”
NGA-West2 Equations for Predicting PGA, PGV, and 5% Damped PSA for Shallow Crustal Earthquakes (2014, methodology): “These IMs were computed using the RotD50 parameter (Boore 2010), which is the median single-component horizontal ground motion across all non-redundant azimuths.”
Empirical Evaluation of Hierarchical Ground‐Motion Models: Score Uncertainty and Model Weighting (2017, methodology): “We acknowledge that the definition of peak motions used by the NGA GMMs is GMrotI50 (Boore et al., 2006), whereas that used in the NGA-West 2 flatfile is rotD50 (Boore, 2010).”
NGA-West2 Ground Motion Model for the Average Horizontal Components of PGA, PGV, and 5% Damped Linear Acceleration Response Spectra (2014, methodology): “The PEER NGA-West2 Project opted to use an alternative definition of the “average” horizontal component referred to as RotD50 that is independent of sensor orientation, but, unlike GMRotI50 used in the NGA-West1 Project, is dependent on spectral period (Boore 2010).”