Distribution of radiocarbon dates used in trenches 1-4 with inferred events,
known historical earthquakes, and inferred archaeoseismic events. Gray boxes indicate depositional hiatuses where
no date could be determined. All dates given herein and in Table 1 correspond to 2σ (95.4%) intervals on these probability
density functions (pdf). Event pdfs are modeled for a Gaussian distribution on the basis of inferred
uncertainties defined in Table 3.