ANALISIS POTENSI TSUNAMI DI LOMBOK UTARA

Jurnal Ilmu dan Teknologi Kelautan Tropis

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Title ANALISIS POTENSI TSUNAMI DI LOMBOK UTARA
POTENTIAL TSUNAMI ANALYSIS IN NORTH LOMBOK
 
Creator Ratuluhain, Eva Susan
Nurjaya, I Wayan
Natih, Nyoman M. N.
 
Subject COMCOT v1.7
earthquake
Flores fault
North Lombok
tsunami
COMCOT v1.7
gempa bumi
Lombok Utara
sesar Flores
tsunami
 
Description Sesar Flores merupakan pemicu gempa bumi pada tanggal 5 Agustus 2018 di Pulau Lombok. Dilaporkan bahwa gempa bumi dengan kekuatan 7,0 Mw saat itu, telah menyebabkan tsunami kecil dengan ketinggian 13,5 cm di pesisir pantai Desa Carik, Lombok Utara. Studi ini bertujuan untuk mensimulasikan potensi bahaya tsunami yang berasal dari aktivitas sesar Flores menggunakan pemodelan tsunami COMCOT v1.7 untuk mengestimasi potensi tinggi tsunami, waktu tiba tsunami, dan potensi area terdampak tsunami. Data historis untuk pusat gempa bumi dalam simulasi adalah gempa bumi pada tanggal 2 September 2018, dengan asumsi kekuatan gempa 7,0 Mw. Berdasarkan data gempa bumi diatas, parameter yang dipilih berupa kedalaman sumber gempa 14 km, luas patahan 47,9 x 15,9 km, dislokasi 2,5 m, dan parameter strike 284o, dip 64o, dan slip 88o. Layer simulasi dibagi menjadi 3 berdasarkan sistem model bersarang, dengan reolusi masing-masing 464 m, 232 m, dan 77 m. Data batimetri diperoleh dari GEBCO dengan resolusi 15-arcsecond. Waktu simulasi penjalaran tsunami yang dilakukan selama 30 menit, menghasilkan tinggi tsunami awal sebesar 0,9 m. Tinggi tsunami maksimum yang teramati di darat adalah 1–2,5 m. Estimasi waktu tiba gelombang pada pesisir Lombok Utara, adalah 3 sampai 13 menit. Hasil pemodelan menunjukkan bahwa wilayah Kecamatan Bayan, Kayangan, Tanjung, dan Gangga berpotensi terkena dampak tsunami. Tinggi maksimum dan kecepatan waktu tiba tsunami di Lombok Utara sangat berpotensi merusak dan dapat menimbulkan korban jiwa, sehingga perlu upaya mitigasi seperti sosialisasi dan pelatihan dalam menghadapi bahaya tsunami, penanaman vegetasi pantai yang sesuai dengan substrat di pantai, dan membangun pemecah gelombang lepas pantai.
The Flores Fault is the one of caused an earthquake on August 5, 2018 in Lombok Island. It is reported that this earthquake with magnitude of 7.0 Mw caused a small tsunami with amplitude of 13.5 cm in the coastal area of Carik village, North Lombok. This study aimed to simulate a potential tsunami hazard from the Flores faults activity using the COMCOT v1.7 tsunami model which estimates potential tsunami height, tsunami arrival time, and potential tsunami affected areas. Historical earthquake data as an epicenter in the simulation was the earthquake on September 2, 2018, with the earthquake magnitude of 7 Mw. On the basis of the earthquake above, the model parameters was chosen, such as the depth of epicenter of 14 km, width fault area of ​​47.9 x 15.9 km, dislocation of 2.5 m, strike of 284o, slip of 64o, and dip of 88o. Simulation layer is divided into 3 layers based on nesting grid system with 464 m, 232 m and 77 m resolution, respectively. Bathymetric data were obtained from GEBCO with a 15-arc second grid size. Tsunami propagation simulation has been performed for duration of 30 minutes, which produced an initial tsunami height of 0.9 m. The maximum tsunami height revealed from the simulation was between 1-2.5 m on land. Estimated arrival time of the tsunami in North Lombok was ftom 3 to 13 minutes. Simulation result showed that sub-district area of Bayan, Kayangan, Tanjung, and Gangga are affected potentially areas by the tsunami. The maximum height and arrival time of the tsunami in North Lombok have the potential to be destructive and can cause casualties, so that mitigation efforts are needed, such as socialization and training in dealing with tsunami hazards, planting coastal vegetation that is suitable for the substrate on the coast, and building offshore breakwaters.
 
 
Publisher Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University
 
Date 2021-04-30
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier https://journal.ipb.ac.id/index.php/jurnalikt/article/view/29336
10.29244/jitkt.v13i1.29336
 
Source Jurnal Ilmu dan Teknologi Kelautan Tropis; Vol. 13 No. 1 (2021): Jurnal Ilmu dan Teknologi Kelautan Tropis; 113-126
2620-309X
2087-9423
10.29244/jitkt.v13i1
 
Language eng
 
Relation https://journal.ipb.ac.id/index.php/jurnalikt/article/view/29336/21595
 
Rights Copyright (c) 2021 Jurnal Ilmu dan Teknologi Kelautan Tropis
https://creativecommons.org/licenses/by-sa/4.0
 

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