Figure 11
Each point represents a station record, where the horizontal axis denotes observed P G A and the vertical axis denotes PLUM-predicted P G A, both in gal. Data points cluster tightly along the diagonal y = x line, indicating strong agreement between predictions and observations. Minor scatter near the diagonal reflects measurement uncertainty and regional amplification effects. Overall, the plot demonstrates high predictive accuracy of the PLUM method within the study dataset.Comparison of predicted and observed PGA. Note(s): Green: Alarm issued was exactly correct. Gray: No alarm issued, and the threshold was not reached. Yellow: Alarm level differed from the expected level by one grade. Red: Alarm level differed by two grades. Source(s): Authors’ own work