| Titre | Mass wasting processes - offshore Sumatra |
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| Auteur | Tappin, D R; McNeil, L C; Henstock, T; Mosher, D |
| Source | Submarine mass movements and their consequences: 3rd International Symposium; par Lykousis, V (éd.); Sakellariou, D (éd.); Locat, J (éd.); Advances in Natural and Technological Hazards Research vol. 27,
2007 p. 327-336, https://doi.org/10.1007/978-1-4020-6512-5 34  Accès ouvert |
| Année | 2007 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20070426 |
| Éditeur | Springer Netherlands |
| Réunion | 3rd International Symposium "Submarine mass movements and their consequences"; Santorini; GR; Octobre 1-3, 2007 |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1007/978-1-4020-6512-5 34 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Région | Sumatra |
| Lat/Long OENS | 90.0000 100.0000 6.0000 0.0000 |
| Sujets | dépôts de pentes; glissements de pentes; stabilité des pentes; analyses de la stabilité des pentes; glissements de terrain; dépôts de glissement de terrain; levés sismiques; levés de reflexion sismiques;
bathymétrie; fosses abyssales; géologie des dépôts meubles/géomorphologie; géologie marine; géophysique |
| Programme | Les géosciences à l'appui de la gestion des océans Aléas géologiques et contraintes à la mise en valeur des ressources extracôtières |
| Diffusé | 2007 01 01 |
| Résumé | (disponible en anglais seulement)
arthquakes are a commonly cited mechanism for triggering submarine landslides that have the potential to generate locally damaging tsunamis. With measured
runups of over 35 metres in northern Sumatra from the December 26th 2004 tsunami source, these runups might be expected to be due, in part, to local submarine landslides. Mapping of the convergent margin offshore of Sumatra using swath bathymetry,
single channel seismic and seabed photography reveals that seabed failures are common, but mainly small-scale, and composed of blocky debris avalanches and sediment flows. These failures would have contributed little to local tsunami runups. Large
landslides are usually formed where there is significant sediment input. In the instance of Sumatra, most sediment is derived from the oceanic plate, and there is little sediment entering the system from the adjacent land areas. Input from the
oceanic source is limited because of the diversion of sediment entering the subduction system off of Sumatra, that is attributed to collision between the Ninetyeast ridge and the Sunda Trench at approximately 1.5 million years ago. |
| GEOSCAN ID | 224525 |
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