Fig. (4) Mahalanobis distance vs. quantile chi square distribution of the acceleration data with 95% simultaneous confidence band, for the deck: (a) absolute punctual acceleration (Outlier to Measured data Ratio, OMR = 81.1%); (b) Window Length (WL) = 1 sec (OMR = 74.4%); (c) WL = 1 sec (OMR = 0.0%); for the towers: (d) absolute punctual acceleration (OMR = 43.0%); (e) WL = 1 sec (OMR = 58.3%); (f) WL = 60 sec (OMR = 22.7%).