Tsunami Fragility — A New Measure to Identify Tsunami Damage —
Shunichi Koshimura*, Yuichi Namegaya**, and Hideaki Yanagisawa***
*Graduate School of Engineering, Tohoku University Aoba 6-6-11-1104, Aramaki, Aoba-ku, Sendai 980-8579, Japan
**Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology C7, 1-1-1 Higashi, Tsukuba 305-8567, Japan
***Tokyo Electric Power Services Co., Ltd. 3-3, Higashiueno 3-Chome, Taito-ku, Tokyo 110-0015, Japan
Tsunami fragility (fragility curve, or fragility function) is a new measure, we propose, for estimating structural damage and fatalities due to tsunami attack, by integrating satellite remote sensing, field survey, numerical modeling, and historical data analysis with geographic information system (GIS). Tsunami fragility is expressed as the structural damage probability or fatality ratio related to hydrodynamic features of tsunami inundation flow, such as inundation depth, current velocity and hydrodynamic force. It expands the capability of estimating potential tsunami damage in a quantitative manner.
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