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The city of Padang, the capital of West Sumatra, has 1 million populations and located on the west coast of Sumatra. The city situated at two earthquake sources that are subduction zone in the Indian Ocean and Sumatra fault inland of Sumatra. Since the year 2006, Padang city is often experiencing an earthquake from both sources. In Mentawai island, about 200 km from Padang City westward, there is still what so-called seismic gap that very potential to generate big earthquake followed by a tsunami. To anticipate this, the mitigation measurements are needed to prepare the people on the west coast of Sumatra, especially in Padang city. One of the activities is to prepare the shelter that can cover around 600,000 people prone to tsunami near the beach. The infrastructures for shelter are very limited. There are only 4 shelters that have been built that have capacity about 2000-3000 people. To anticipate this condition, it needs to build what so-called self-supported shelter. The self-supported shelter is an idea or concept of utilizing a mosque or musholla to be a shelter by participating in the community surrounding its construction and management. The shelter will have a function as the ritual of religion and the tsunami evacuation place. Mosque or musholla is selected to shelter since it does not need to buy land, available in the near residence area, and easy to get funds in its construction. There are some aspects need to be prepared in order to function a shelter well, that is, the selection of location, the evacuation system, the construction method, the accessibility, and the structural design. This paper focus on analysis of the accessibility of evacuation routes to self-supported shelter in terms of time estimation, road facilities, and barrier during evacuation. The case study is chosen as the sub-district of Pasie Nan Tigo that has about 12,000 populations. The result can be a model in designing accessibility to self-supported shelters in the other area.

Accessibilty analysis of tsunami evacuation route to self supported shelter in sub-district Pasie Nan Tigo, Padang City