Preprints
https://doi.org/10.5194/nhess-2021-375
https://doi.org/10.5194/nhess-2021-375
 
14 Jan 2022
14 Jan 2022
Status: this preprint is currently under review for the journal NHESS.

Tsunami scenario triggered by submarine landslide offshore of northern Sumatra Island and its hazard assessment

Haekal Azief Haridhi1,9,10, Bor-Shouh Huang2, Kuo-Liang Wen3, Arif Mirza4, Syamsul Rizal1,9, Syahrul Purnawan1,9, Ilham Fajri12, Frauke Klingelhoefer5, Char Shine Liu4, Chao Shing Lee6, Crispen R. Wilson7, Tso-Ren Wu8, Ichsan Setiawan1,9,11, and Van Bang Phung2 Haekal Azief Haridhi et al.
  • 1Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Syiah Kuala, Banda Aceh, Indonesia
  • 2Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
  • 3Department of Earth Sciences, National Central University, Taoyuan, Taiwan
  • 4Ocean Center, National Taiwan University, Taipei, Taiwan
  • 5Ifremer, Department of Marine Geosciences, Plouzané, France
  • 6Institute of Geosciences, National Taiwan Ocean University, Keelung, Taiwan
  • 7ENC, Washington, D.C., USA
  • 8Graduate Institute of Hydrological and Oceanic Sciences, National Central University, Taoyuan, Taiwan
  • 9Research Center for Marine Sciences and Fisheries, Universitas Syiah Kuala, Banda Aceh, Indonesia
  • 10Tsunami and Disaster Mitigation Research Center, Universitas Syiah Kuala, Banda Aceh, Indonesia
  • 11Graduate School of Mathematics and Applied Sciences, Universitas Syiah Kuala, Banda Aceh, Indonesia
  • 12Department of Capture Fisheries, Marine and Fisheries Polytechnic Aceh, Great Aceh, Indonesia

Abstract. Near the northern border of Sumatra, the right-lateral strike-slip Sumatran Fault Zone splits into two branches and extends into the offshore, as revealed by seismic sounding surveys. However, due to its strike-slip faulting characteristics, the Sumatran Fault Zone’s activity is rarely believed to cause tsunami hazards in this region. According to two reprocessed reflection seismic profiles, the extended Sumatran Fault Zone is strongly associated with chaotic facies, indicating that large submarine landslides have been triggered. Coastal steep slopes and new subsurface characteristics of submarine landslide deposits were mapped using recently acquired high-resolution shallow bathymetry data. Slope stability analysis revealed some targets with steep morphology to be close to failure. In an extreme case, an earthquake of Mw 7 or more occurred, and the strong ground shaking triggered a submarine landslide off the northern shore of Sumatra. Based on a simulation of tsunami wave propagation in shallow water, the results of this study indicate a potential tsunami hazard from a submarine landslide triggered by the strike-slip fault system. The landslide tsunami hazard assessment and early warning systems in this study area can be improved on the basis of this proposed scenario.

Haekal Azief Haridhi et al.

Status: open (extended)

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Haekal Azief Haridhi et al.

Haekal Azief Haridhi et al.

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Short summary
Near the northern end of Sumatra, the horizontal movement Sumatran Fault Zone extended to its northern offshore. The movement of offshore fault segments trigger the submarine landslides and induce tsunami. Scenarios of a significant tsunami caused by the combined effect of an earthquake and its triggered submarine landslide at coast was proposed in this study. Based on our finding, the landslide tsunami hazard assessment and early warning systems in this region should be urgently considered.
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