Chapter 1. An Assessment of Building Vulnerability to Tsunami Using the PTVA-4 Method: Case Study of the 2006 Cilacap Tsunami Tragedy


FX Anjar Tri Laksono¹,²
¹Doctoral School of Earth Sciences, Department of Geology and Meteorology, Institute of Geography and Earth Sciences, Faculty of Sciences, University of Pecs, Pécs, Baranya, Hungary
²Department of Geological Engineering, Faculty of Engineering, Jenderal Soedirman University, Purbalingga, Central Java, Indonesia

Part of the book: Tsunamis: Detection Technologies, Response Efforts and Harmful Effects


The tsunami tragedy in southern Java, Indonesia, in 2006 induced casualties of almost 1000 people and an economic loss of approximately USD 1 billion. The recurrence period for the tsunami in southern Java is not yet known. The subduction zone between the Eurasia continental plate and the Indo-Australia oceanic plate throughout the southern region of Java Island is a vulnerable zone whose number of earthquake sources are unknown until nowadays. This zone is a densely populated area and the largest source of Indonesian economic income besides the north coast of Java. Therefore, a building vulnerability study is required to minimize casualties and financial losses. The Papathoma Tsunami Vulnerability Assessment (PTVA-4) modeling is a suitable method to be developed because it is reliable and does not need high costs. The discussion of this chapter presents an example of the PTVA-4 modeling application in Cilacap, Indonesia, the area that was hit by the 2006 tsunami.

Keywords: Indonesia, PTVA-4, relative vulnerability index, surface roughness coefficient, tsunami hazard index


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