Buildings' Tsunami Vulnerability Index (BVI) Calculations
Description
Calculations of BVI (buildings' tsunami vulnerability index) for sampled buildings from the 2011 Great East Japan Earthquake and Tsunami (Rikuzentakata city, Natori city and Yamamoto town), 2018 Sulawesi tsunami (Palu city), and 2018 Sunda Strait tsunami (Banten and Lampung provinces). Field survey data sources as referenced in the article and data spreadsheet. The equation used to calculate the BVI was refined through expert opinion survey, and the buildings' assessed were divided into four categories of vulnerability (from less vulnerable to critically vulnerable) based on their index values.
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Buildings from the field survey data were screened based on availability of data relevant to the index, as well as to reduce dimensionality that could affect the assessed vulnerabilities such as distance from nearest body of water and building row. Coastal defence and vegetation were identified using satellite image from the nearest data prior to the tsunami events (via Google Earth). The vulnerability index values were then calculated using the refined BVI equation. The values were divided into 4 classes or quartiles, depending on the minimum and maximum possible values. As such, four vulnerability classes were defined for this study as V1 (less vulnerable), V2 (vulnerable), V3 (highly vulnerable), and V4 (critically vulnerable). Damage state data gathered from the three different tsunami events and thus field surveys were modified to standardise them into five categories, i.e. DS1 (only inundated), DS2 (minor damages), DS3 (moderate damages), DS4 (major damage), and DS5 (completely damaged). Further descriptions of the damage states are available in the main body of the research article. The data presented in the dataset were all subsequently used to identify trends and the relationship between hazard parameter (inundation depth), building vulnerability classes, and the observed damages.