A lot of field investigations for damage to buildings are carried out after a large earthquake. In concordance with the variety of -investigations, the building damage descriptions are really incoherent because a coordinated damage scale has not been prepared yet. This paper proposed a new chart for describing the building damage patterns by seismic vulnerability so as to help investigators to classify building damaged without a gross error. By using this chart as a common scale, various damage scales defined by the organizations concerned can be compared with each other. Furthermore, vulnerability function for wooden building was obtained at each damage pattern.
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Okada et al. (1999) studied this question.