Large, deepwater slope failures: Implications for landslide-generated tsunamis.

Lo Iacono, C., Gracia, E., Zaniboni, F., Pagnoni, G., Tinti, S., Bartolome, R., Masson, D. G., Wynn, R. B., Lourenco, N., Pinto de Abreu, M., Danobeitia, J. J. and Zitellini, N. (2012) Large, deepwater slope failures: Implications for landslide-generated tsunamis. Geology, 40 (10). pp. 931-934. DOI 10.1130/G33446.1.

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Deepwater landslides are often underestimated as potential tsunami triggers. The North Gorringe avalanche (NGA) is a large (∼80 km3 and 35 km runout) newly discovered and deepwater (2900 m to 5100 m depth) mass failure located at the northern flank of Gorringe Bank on the southwest Iberian margin. Steep slopes and pervasive fracturing are suggested as the main preconditioning factors for the NGA, while an earthquake is the most likely trigger mechanism. Near-field tsunami simulations show that a mass failure similar to the NGA could generate a wave >15 m high that would hit the south Portuguese coasts in ∼30 min. This suggests that deepwater landslides require more attention in geo-hazard assessment models of southern Europe, as well as, at a global scale, in seismically active margins.

Document Type: Article
Refereed: Yes
Open Access Journal?: No
Publisher: GSA, Geological Society of America
Projects: FLOWS
Date Deposited: 24 Apr 2014 09:08
Last Modified: 24 Apr 2014 09:08

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