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Y. Yamada et al. (eds.), Submarine Mass Movements and Their Consequences,
Advances in Natural and Technological Hazards Research 31,
DOI 10.1007/978-94-007-2162-3_33, © Springer Science+Business Media B.V. 2012
Abstract We analyzed 9,750 km
2
of high-resolution, bathymetric data recorded
by a multi-beam eco-sounder along the southwestern Pacific margin of Colombia
(1°25¢N–2°00¢N and 78°44¢W–80°14¢W). This margin has experienced several great
subduction zone earthquakes during the twentieth century (1906, Mw = 8.8; 1942,
Mw = 7.8; 1958, Mw = 7.7, 1979, Mw = 8.2). The most prominent morphological
features imaged by the survey include the Tumaco high, the Emerald canyon and
the Mira canyon, limited on its western edge by the Manglares high. Our results
suggesting that the Mira canyon was likely formed by a 50-km-long, earthquake-
generated landslide that displaced marine sediments to depths down to 1,000 m
depth. Geomorphology dating using the scarp-fault diffusion hypothesis suggests
that the 3200-2800 BP earthquake event could have triggered its configuration.
Keywords Submarine mass failures • High-resolution swath bathymetric data
•Geomorphologicscarpdating•Tsunami•Seismicrelection•Manglaresbasin
•Colombia
C.A. Vargas (*)
Departamento de Geociencias, Universidad Nacional de Colombia,
Ed. Manuel Ancizar, Bogotá, Colombia
e-mail: cavargasj@unal.edu.co
P. Mann
Institute for Geophysics, University of Texas at Austin, J. J. Pickle Research Campus,
Bldg. 196, Austin, TX 78758, USA
e-mail: paulm@ig.utexas.edu
C. Gómez
Agencia Nacional de Hidrocarburos, Av. El Dorado, Edif. Cámara
Colombiana Infraestructura, Bogota, Colombia
e-mail: clemencia.gomez@anh.gov.co
Chapter 33
Morphologic Expression of Accretionary
Processes and Recent Submarine Landslides
Along the Southwestern Pacific Margin
of Colombia
Carlos A. Vargas, Paul Mann, and Clemencia Gómez [AU1]
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