Knowledge of earthquake probabilities is essential for planning earthquake hazard mitigation, and valid estimation of future probabilities requires precise information on past earthquake occurrences. Previous studies documented effects of earthquakes on trees and how these effects are recorded by tree rings. Tree-ring analysis can be combined with other disciplines to date and delineate earthquake induced disturbance. Two case studies show the impact of the 1964 Alaska earthquake on shoreline trees and how a previously unknown southern San Andreas fault earthquake was recorded in tree rings.

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