A visual damage inspection was conducted using pre and post tsunami
QuickBird images acquired on 15 April 2007, 24 September 2009, 29 September
2009, 02 October 2009 and November 2009. The damaged structures were classified into four
categories: washed-away, collapsed, major damage and survived (as previously mentioned
in Fig. 7). The number of inspected houses and structures in the four study areas, namely,
Pago Pago, Amanave, Poloa and Leone, totalled 451, and the results are summarised in Fig.
13 and Table 2 (Gokon et al., 2011).