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| Collot, Jean-yves; Ratzov, Gueorgui; Silva, P.; Proust, J.‐n.; Migeon, Sebastien; Hernandez, M.‐j.; Michaud, F.; Pazmino, A.; Barba Castillo, D.; Alvarado, A.; Khumara, S.. |
| Deciphering the migration pattern of the Esmeraldas submarine Canyon (EC) and its history of cut‐and‐fill allows constraining the Pliocene‐Pleistocene tectonic evolution of the Ecuador‐Colombia convergent margin. Swath bathymetry, multichannel seismic reflection and chronological data show that the EC is a 143‐km–long, shelf‐incising, river‐connected canyon that started incising slope apron deposits in the Manglares fore‐arc basin ~ 5.3 Ma ago. The EC inception appears contemporaneous with the subduction of the Carnegie Ridge that is believed to have initiated 5‐6 Myr ago and is considered an indirect cause of the EC formation. During its two‐stage left‐lateral migration, the EC upper‐half scoured deep incisions providing evidences for uplift episodes in... |
| Tipo: Text |
Palavras-chave: Convergent margin tectonics; Submarine canyon; Fore-arc basin; Natural hazards; Paleoseismology. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00509/62060/66236.pdf |
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| Collot, Julien; Migeon, Sebastien; Spence, G.; Legonidec, Y.; Marcaillou, B.; Schneider, J.-l.; Michaud, F.; Alvarado, A.; Lebrun, J.-f.; Sosson, M.; Pazmino, A.. |
| cuador and southwest (SW) Colombia suffered widespread damage during the twentieth century as a result of some of the greatest subduction earthquakes and associated tsunamis ever recorded. In 1906, the Ecuador‐SW Columbia margin, located at the transition between the continent and deep ocean, ruptured over a 500‐kilometer length as a single great (Mw = 8.8) subduction earthquake (Figure 1a) [Kelleher, 1972]. The 1906 rupture zone was partially reactivated in 1942, 1958, and 1979 by earthquakes of Mw 7.7 to 8.2 (Figure 1b), with 100‐200 kilometerlong rupture zones [Beck and Ruff, 1984]. Such considerable variation in earthquake rupture length and magnitude in this area's seismic cycles during the last century has raised questions about the nature and... |
| Tipo: Text |
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| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/00451/56257/57826.pdf |
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