Conference Paper Comparison of building damage caused by the 2011 Tohoku earthquake tsunami and the 2013 Super Typhoon Haiyan storm surge

サッパシー, アナワット  ,  Suppasri, Anawat  ,  リーラワット, ナット  ,  LEELAWAT, NATT  ,  チャーウエ, イングリッド  ,  Charvet, Ingrid  ,  イ, ケリーン チョンヨン  ,  Yi, Carine J.  ,  今村, 文彦  ,  Imamura, Fumihiko

2015-06 , International Union of Geodesy and Geophysics
Building damage assessment is one of the important issues for coastal management against coastal hazards, i.e. tsunamis and storm surges. This study presents analysis results of building damage data in case of the two major coastal disasters recently, tsunami induced by the 2011 Tohoku earthquake and storm surge by the 2013 typhoon Haiyan. Damage data by the tsunami in Japan was collected from field surveys and includes flow depth, building material, number of stories and occupancy type for about 250,000 buildings. Numerical simulations were conducted to obtain characteristic tsunami measures such as flow velocity. These data were analysed using advanced statistical methods to create fragility functions. The effect of floating debris was also considered by using a binary indicator of debris impact based on the proximity of a structure from a debris source. For the storm surge, we obtained detailed damage data of 166 school buildings in 39 schools from Tananuan municipality, the Philippines. The data contain building area and percentage of damage to roof, ceiling, window, door and wall for each building. The data was then overlaid on the storm surge inundation map created by field surveys and obtain the distance of each building from the sea. The percentage of damage and distance from the sea were plotted in order to compare the damage between the buildings inside and outside the storm surge inundation zone (i.e. wind only vs. wind and surge). Damage from Haiyan is compared to tsunami damage results normalizing the damage scale and comparing damage probabilities. The results bring cross-interdisciplinary benefits not only to coastal engineers to understand the different damage but also to decision makers to decide the no-build zones in case of integrated coastal hazards.

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