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Nat. Hazards Earth Syst. Sci., 14, 3231-3241, 2014
https://doi.org/10.5194/nhess-14-3231-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
04 Dec 2014
Developing fragility functions for the areas affected by the 2009 Samoa earthquake and tsunami
H. Gokon1, S. Koshimura2, K. Imai2, M. Matsuoka3, Y. Namegaya4, and Y. Nishimura5 1Graduate School of Engineering, Tohoku University, Sendai, Japan
2International Research Institute of Disaster Science, Tohoku University, Sendai, Japan
3Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama, Japan
4Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
5Institute of Seismology and Volcanology, Graduate School of Science, School of Science, Hokkaido University, Sapporo, Japan
Abstract. Fragility functions in terms of flow depth, flow velocity and hydrodynamic force are developed to evaluate structural vulnerability in the areas affected by the 2009 Samoa earthquake and tsunami. First, numerical simulations of tsunami propagation and inundation are conducted to reproduce the features of tsunami inundation. To validate the results, flow depths measured in field surveys and waveforms measured by Deep-ocean Assessment and Reporting of Tsunamis (DART) gauges are utilized. Next, building damage is investigated by visually interpreting changes between pre- and post-tsunami high-resolution satellite images. Finally, the data related to tsunami features and building damage are integrated using Geographic Information System (GIS), and tsunami fragility functions are developed based on the statistical analyses. From the developed fragility functions, we quantitatively understood the vulnerability of a coastal region in American Samoa characterized by steep terrains and ria coasts.

Citation: Gokon, H., Koshimura, S., Imai, K., Matsuoka, M., Namegaya, Y., and Nishimura, Y.: Developing fragility functions for the areas affected by the 2009 Samoa earthquake and tsunami, Nat. Hazards Earth Syst. Sci., 14, 3231-3241, https://doi.org/10.5194/nhess-14-3231-2014, 2014.
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