An overview of the role of long-term tectonics and incoming plate structure on segmentation of submarine mass wasting phenomena along the Middle America Trench.

Harders, Rieka, Ranero, Cesar and Weinrebe, Reimer Wilhelm (2011) An overview of the role of long-term tectonics and incoming plate structure on segmentation of submarine mass wasting phenomena along the Middle America Trench. [Talk] In: IGCP585 - 5. International Symposium on Submarine Mass Movements and Their Consequences. , 24.10.-26.10.2011, Kyoto, Japan . Submarine Mass Movements and Their Consequences : 5th International Symposium / ed. Y. Yamada .... ; pp. 391-402 . Advances in Natural and Technological Hazards Research, 31 .

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Abstract

We study mass wasting along the Middle America Trench (MAT), a subduction zone dominated by tectonic erosion, using a comprehensive data set of seafloor relief. We integrate previous studies of long-term tectonic processes to analyze how they influence the evolution of the slope structure and precondition the continental slope for mass wasting. We have used the distribution of an inventory of 147 slope failure structures along the MAT to discuss their relation to subduction erosion. We interpret that preconditioning of the slope by long-term tectonics, interacts in a shorter-term scale with features on the under-thrusting oceanic plate to modulate the abundance and types of mass wasting phenomena. The complex origin of the incoming oceanic plate has produced abrupt lateral changes in plate age, crustal thickness, relief, and response to bending deformation at the trench, leading to its partitioning into 6 segments. We found that the continental-slope failure style and abundance are partitioned into 6 segments that spatially match the ocean plate segments

Document Type: Conference or Workshop Item (Talk)
Additional Information: Die gedruckte Fassung ist erweitert / The printed ed. is extended !
Keywords: Meeresgeologie; Geophysics; Submarine landslide; convergent margin; subduction erosion
Research affiliation: OceanRep > SFB 574 > A1
OceanRep > SFB 574
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Date Deposited: 03 Feb 2012 10:09
Last Modified: 23 Feb 2012 05:56
URI: http://oceanrep.geomar.de/id/eprint/13631

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