Accuracy of numerical simulation for transoceanic tsunami - in

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					 Accuracy of numerical simulation for transoceanic tsunami
     - in case of 2006 Kuril Island earthquake tsunami


                                         SOI Asia Special Symposium
                                         Kingo Munemoto, MC 1st
                                         DCRC,Tohoku University




• JMA issuing the Tsunami warning for far-fields as well as
  near-fields
• Characteristic of 2006 Kuril Island earthquake tsunami
• Numerical analysis with CG Animation
• Accuracy of numerical simulation
                                                              1
• Necessary to improve the accuracy of warning system
Characteristics of 2006 Kuril Island earthquake Tsunami

               earthquake happened
 0min
 5min         Tsunami warning issued  • Far- field Tsunami
                                      • 5 min. Tsunami warning issued
            Tsunami advisory canceled • First wave is not so big
                                      • Damage was small
6hours                                 (a few fishing boats turn-overed
              Maximum Tsunami height    and no human damage reported)
              observed                • Maximum Tsunami heights were
9hours                                  observed after Tsunami advisory
             Fishing boat damaged and   canceled
             turn-overed


        •   Computational domain of JMA’s tsunami warning system was
            not large enough.
        •   Difficulty of reconstructing following wave of tsunami by 2
            numerical simulation
       3
DCRC
             About my research
                                     2006 Kuril Island Earth
                                     quake Tsunami indicate


                Kuril Trench           We have to consider
                                       the scattering wave
              Japan Trench
                                       generated on the
                                       Emperor Seamount
            Emperor Seamount Chain     Chain.
• Where is the most dangerous area of the wave origin in
  view of the effect of scattering wave?
• How long does the Tsunami continue if it occurs on Japan
  Trench or Kuril Trench?
• To make clear the conditions which makes scattering wave
                                                         4
  or edge wave bigger.
Accuracy of numerical simulation for continuous wave
                       • We can reconstruct the first
                         wave of tsunami.
                       • The behaviour of continuous
                         wave is sometimes too complex
                         to reconstruct.
                       • To improve the accuracy of
                         numerical simulation, we have to
                         use finer bathymetry data ,
                         however it takes a lot of time.

                         To make tsunami warning
                         system more credible,and to let
                         everyone believe the tsunami
                         warning system, we still have a
               DCRC      lot of things remained.    5
Thank you for your kind attention




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