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Chapter 9:Hazard Analysis—Tsunamis <br /> 9.3 Probability of Occurrence <br /> 9.3.1.1 Distant Tsunamis <br /> Distant tsunami events occur with a roughly 7% probability in a year. Events with smaller <br /> waves have a higher probability than large waves (see Figure 9-3). Waves can strike all <br /> coasts and persist up to several hours. <br /> HBMTVS RECURRENCE PROBAB0.R % <br /> MLO TSUNAMIS SINCE 1832;COX,CURTIS <br /> 30 <br /> 7S t € + <br /> j r I i i 1 <br /> 1 <br /> LL p 0 <br /> 15 <br /> _ w o o : <br /> I <br /> r <br /> i <br /> r 1 I <br /> 1 10 100 <br /> PR08AMMY,YEARS,RB01Hi UREATER IRAN <br /> G7 OBSERVED 11Y,Y17� <br /> Figure 9-3. Tsunami Height vs.Recurrence Probability for Hilo <br /> 9.3.1.2 Local Tsunami <br /> Local tsunami events occur with a roughly 2%probability in a year. A local tsunami will be <br /> of limited extent and duration. Near the seismic source, the waves may be 40 feet high but <br /> have a short period and diminish rapidly, as demonstrated by the 1975 Halape tsunami <br /> (Figure 9-4 shows the wave heights from the 1975 Halape tsunami as they traveled around <br /> the coast to North Kona). <br /> 9-5 Hawaii County Multi-Hazard Mitigation Plan <br />