Tsunami-trace Distribution around Buildings and Its Practical Use - Examples in the 2009 Samoa Earthquake Tsunami -

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Examples of tsunami-trace distribution around building in the 2009 Samoa Earthquake tsunami are presented, and compared with those by laboratory experiments. It is confirmed through the comparison that the tsunami-trace distributions around buildings by the field survey are consistent with those by the laboratory experiments and involve information such as an inundation flow direction, velocity and force at the maximum incident inundation depth, and strength of buildings. Variation coefficient of inundation flow velocity caused by a measured point difference at the front and the back of building is also examined. In addition, based on a recent knowledge of inundation flow velocity, the existing judgment criterion for the degree of damage to buildings is re-examined, and a newly proposed judgment criterion is confirmed to be consistent with Koshimura et al.'s tsunami fragility curve for Japanese wooden buildings.