Tsunami Risk Assessment on Public Facilities in Southern Part of Bantul Regency, Yogyakarta

¹ Department of Disaster Management, Politeknik Akbara, Jl. Sumbing Raya, Mojosongo, Jebres, Surakarta 57127
² Research Center for Ecology and Ethnobiology, National Research and Innovation Agency, Jl. Raya Jakarta-Bogor KM. 46, Cibinong, Bogor 16911
³ Department of Land and Spatial Planning Sleman, Jl. Magelang No.10, Bangun Rejo, Tridadi, Sleman, Sleman Regency, Special Region of Yogyakarta 55511
⁴ Blue Seed Indonesia, Jalan Poros Maros - Makassar KM.25, Taraoda, Turikale 90511, Kab. Maros, Sulawesi Selatan, Indonesia
⁵ Department of Infrastructure Technology and Regional Development, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Way Huwi, Kec. Jati Agung, Kabupaten Lampung Selatan, Lampung 35365
⁶ Department of Environmental Engineering, Akademi Teknik Tirta Wiyata, Jl. Duku I No 54 Perumahan Korpri ABRI Kramat Selatan
⁷ Regional Agency for Disaster Management of Bantul Regency, Jl. KH. Wachid Hasyim, Sumuran, Palbapang, Bantul, D.I. Yogyakarta 55714

^* Corresponding author: acintyan@gmail.com

Abstract

The southern part of Java Island is susceptible to tsunamis as its role as a subduction zone between Indo-Australian and Eurasian plates. On July 17, 2006, a tsunami struck Java's south coast triggered by an earthquake and affected more than 300 km of shoreline, as well as claimed more than 730 casualties. It is important to assess the risk in the southern part of Java. This research aims to analyze tsunami risk assessments on public facilities in the southern part of Bantul Regency, Yogyakarta. The Tsunami hazard map was created by using tsunami modeling from BMKG. Public facilities footprint such as health facilities, religious facilities and school were derived from data provided by Open Street Map (OSM). The Papathoma Tsunami Vulnerability Assessment (PTVA) model, specifically developed to estimate the relative vulnerability of buildings to tsunami hazards, is used to generate a building vulnerability map. A geographic information system (GIS) was utilized to calculate and visualize the hazard, vulnerability, and risk map. A total of 394 buildings were analyzed with the results that public facilities in three sub-districts, namely Srandakan, Sanden and Kretek, had varying levels of building vulnerability ranging from minor, moderate, average and high with RVI values ranging from 1.5 to 3.4. Additionally, tsunami risk assessment of public facilities indicates that buildings within Bantul Regency are categorized as having very high, high, moderate, or low levels of building risk.