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Hazard assessment of underwater landslide-generated tsunamis: a case study in the Padang region, Indonesia

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  • Sascha Brune
  • Andrey Babeyko
  • Christoph Gaedicke
  • Stefan Ladage

Abstract

Submarine landslides can generate local tsunamis with high run-ups, posing a hazard to human lives and coastal facilities. Both ancient (giant Storegga slide off Norwegian coast, 8200 B. P.) and recent (Papua New Guinea, 1998) events show high potential danger of tsunamigenic landslides and the importance of mitigation efforts. This contribution presents newly discovered landslides 70 km off Padang (Western Sumatra, Indonesia) based on recent bathymetry measurements. This highly populated city with over 750,000 inhabitants exhibits high tsunami vulnerability due to its very low elevation. We model tsunamis that might have been induced by the detected landslide events. Estimations of run-up heights extrapolated from offshore tsunami amplitudes for Padang and other locations in the northern Mentawai fore-arc basin yield maximum values of about 3 m. We also provide a systematic parametric study of landslide-induced tsunamis, which allows us to distinguish potentially dangerous scenarios for Padang. Inside the fore-arc basin, scenarios involving volumes of 0.5–25 km³ could endanger Padang. Apart from slide volume, the hazard distribution mainly depends on three landslide parameters: distance to Padang, water depth in the generation region, and slide direction. Copyright Springer Science+Business Media B.V. 2010

Suggested Citation

  • Sascha Brune & Andrey Babeyko & Christoph Gaedicke & Stefan Ladage, 2010. "Hazard assessment of underwater landslide-generated tsunamis: a case study in the Padang region, Indonesia," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 53(2), pages 205-218, May.
    • Handle: RePEc:spr:nathaz:v:53:y:2010:i:2:p:205-218
    DOI: 10.1007/s11069-009-9424-x
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    References listed on IDEAS

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    1. Stefano Tinti & Elisabetta Bortolucci & Cesare Vannini, 1997. "A Block-Based Theoretical Model Suited to Gravitational Sliding," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 16(1), pages 1-28, July.
    2. Eric Geist & Tom Parsons, 2006. "Probabilistic Analysis of Tsunami Hazards," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 37(3), pages 277-314, March.
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    1. Mohammadsadegh Nouri & Amin Rashidi & Masoud Montazeri Namin & Dan H. Shugar, 2023. "Submarine landslide tsunami hazard assessment for the western Makran based on a deterministic approach," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 118(2), pages 1117-1136, September.
    2. H. Taubenböck & N. Goseberg & G. Lämmel & N. Setiadi & T. Schlurmann & K. Nagel & F. Siegert & J. Birkmann & K.-P. Traub & S. Dech & V. Keuck & F. Lehmann & G. Strunz & H. Klüpfel, 2013. "Risk reduction at the “Last-Mile”: an attempt to turn science into action by the example of Padang, Indonesia," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 65(1), pages 915-945, January.

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