Pemodelan Waktu Tiba Gelombang Tsunami di Wilayah Pesisir Provinsi Sulawesi Barat

Erwan Susanto(1*), Muhammad Arsyad(2), Subaer Subaer(3), Akbar Rian Setyahagi(4),

(1) Stasiun Geofisika Gowa (BMKG)
(2) Universitas Negeri Makassar
(3) Universitas Negeri Makassar
(4) Stasiun Geofisika Nganjuk (BMKG)
(*) Corresponding Author



Abstract


Provinsi Sulawesi Barat merupakan provisi baru yang wilayahnya berkembang dengan pesat dari segi pembangunan infrastruktur. Wilayah Sulawesi barat juga merupakan salah satu tujuan wisata khususnya wisata pantai karena memiliki pemandangan pantai yang bagus. Selain itu juga Sulawesi Barat memiliki beberapa pelabuhan yang fungsinya sangat sentral sebagai akses keluar masukkya barang-barang kebutuhan pokok. Ditinjau dari segi bencana, wilayah Sulawesi Barat sangat rawan terhadap bencana geologi salah satunya tsunami karena wilayahnya yang langsung menghadap ke laut dan dekat  dengan sesar naik makassar. Sesar ini merupakan salah satu sesar aktif di Indonesia. Catatan sejarah menyebutkan bahwa sesar ini telah 3 kali menyebabkan gempabumi besar yang memicu terjadinya tsunami.  Untuk mengetahui travel time (waktu tiba) tsunami di wilayah Provinsi Sulawesi Barat dilakukan pemodelan dengan software TUNAMI-N2 Yanagisawa. Data yang digunakan berupa parameter sesar pembangkit tsunami, data batimetri dari GEBCO (General Bathymetric Chart of The Ocean) dan data lokasi observasi. Hasil pemodelan menunjukkan bahwa travel time (waktu tiba) tsunami mencapai wilayah pesisir Provinsi Sulawesi Barat paling cepat adalah 7.17 menit yaitu di pantai Tapandulu Kabupaten Mamuju.   

Kata kunci: pemodelan tsunami, TUNAMI-N2 Yanagisawa, run up, travel time

 

West Sulawesi Province is a new provision whose territory is developing rapidly in terms of infrastructure development. West Sulawesi region is also one of the tourist destinations, especially beach tourism because it has a good beach view. In addition, West Sulawesi also has several ports whose function is very central as access to and out of staple goods. In terms of disasters, the area of West Sulawesi is very prone to geological disasters, one of which is the tsunami because its area directly faces the sea and is close to the Makassar fault. This fault is one of the active faults in Indonesia. Historical records say that this fault had caused a large earthquake three times which triggered a tsunami. To find out the tsunami travel time in the region of West Sulawesi Province, modeling was done with the Yanagisawa TUNAMI-N2 software. The data used are tsunami fault fault parameters, bathymetry data from GEBCO (General Bathymetric Chart of the Ocean) and observation location data. The modeling results show that the tsunami travel time reaches the coastal area of West Sulawesi Province, the fastest is 7.17 minutes, namely on the beach of Tapandulu, Mamuju Regency.

Keywords: tsunami modelling, TUNAMI-N2 Yanagisawa, run up, travel time


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