Articles | Volume 12, issue 8
Nat. Hazards Earth Syst. Sci., 12, 2689–2697, 2012
Nat. Hazards Earth Syst. Sci., 12, 2689–2697, 2012

Research article 24 Aug 2012

Research article | 24 Aug 2012

Developing Tsunami fragility curves using remote sensing and survey data of the 2010 Chilean Tsunami in Dichato

E. Mas1, S. Koshimura2, A. Suppasri3, M. Matsuoka4, M. Matsuyama5, T. Yoshii6, C. Jimenez7, F. Yamazaki8, and F. Imamura1 E. Mas et al.
  • 1International Research Institute of Disaster Science (IRIDeS), Tsunami Engineering Laboratory, Tohoku University, Japan
  • 2IRIDeS, Laboratory of Remote Sensing and Geoinformatics for Disaster Management, Tohoku University, Japan
  • 3IRIDeS, Earthquake induced Tsunami Risk Evaluation (Tokio Marine), Tohoku University, Japan
  • 4Geoinformation Center, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Japan
  • 5Civil Engineering Laboratory, Central Research Institute of Electric Power Industry, Japan
  • 6Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, Japan
  • 7Universidad Nacional Mayor de San Marcos, FENLAB, Peru
  • 8Department of Urban Environment Systems, Graduate School of Engineering, Chiba University, Japan

Abstract. On 27 February 2010, a megathrust earthquake of Mw = 8.8 generated a destructive tsunami in Chile. It struck not only Chilean coast but propagated all the way to Japan. After the event occurred, the post-tsunami survey team was assembled, funded by the Japan Science and Technology Agency (JST), to survey the area severely affected by the tsunami. The tsunami damaged and destroyed numerous houses, especially in the town of Dichato. In order to estimate the structural fragility against tsunami hazard in this area, tsunami fragility curves were developed. Surveyed data of inundation depth and visual inspection of satellite images of Dichato were used to classify the damage to housing. A practical method suitable when there are limitations on available data for numerical simulation or damage evaluation from surveys is presented here. This study is the first application of tsunami fragility curves on the South American Pacific coast and it might be of practical use for communities with similar characteristics along the west Pacific coast. The proposed curve suggests that structures in Dichato will be severely damaged – with a 68% probability – already at 2 m tsunami inundation depth.