Developing fragility functions for the areas affected by the 2009 Samoa earthquake and tsunami

H. Gokon, S. Koshimura, K. Imai, M. Matsuoka, Y. Namegaya, Y. Nishimura

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3231-3241
Number of pages11
JournalNatural Hazards and Earth System Sciences
Volume14
Issue number12
DOIs
Publication statusPublished - 2014 Dec 4

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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