Fig. 1. PTF concept.
a Timeline for tsunami warning: real-time information from an earthquake that just occurred and from the ongoing tsunami gradually integrates b local long-term hazard information, c progressively increasing the precision of the probabilistic forecasts (hazard curves) produced by the Probabilistic Tsunami Forecasting (PTF). d At any time, PTF can be transformed into alert levels (here represented as traffic lights) useful for decision making. In the current study, implementation refers to the time t1, when only earthquake magnitude and hypocentre estimates are available from real-time observations.