von Huene, Roland, Ranero, Cesar and Weinrebe, Reimer Wilhelm (2010) Arrest of the 2010 Great Chile Earthquake Rupture. [Talk] In: SFB 574 Subduction Workshop. , 04.-07.11.2010, Pucon, Chile .

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Abstract

The great Chilean earthquake of 27 February 2010 occurred along a convergent margin previously surveyed with modern geophysical methods. Modern data resolve subducting ocean plate relief that probably arrested earthquake rupture. The northern limit of rupture was at the subducted extension of Juan Fernandez Ridge (JFR). JFR relief increases as the plate is faulted during bending into the trench thereby elevating the plate boundary 1-3-km. At the intersection of relief with the trench axis turbidite transport from
the south is impeded producing trench turbidite fill 2-3-km thick. The southern rupture limit coincides with the subducted projection of Mocha Fracture Zone (MFZ), a 20-km wide structure with thin fractured crust and seafloor relief to 1- km. Seismically imaged beneath the frontal sediment prism is a plate interface between accreted and subducted sediments. Farther landward, where the 2010 earthquake rupture and aftershocks occurred, the upper plate
is margin framework rock and the plate interface separates this metamorphic basement from subducted sediment. These observations show that subducted lower plate high-relief can affect the spatial organization of great earthquake rupture, as can the upper plate discontinuity between a frontal accreted sediment prism and the margin framework rock.

Document Type:	Conference or Workshop Item (Talk)
Keywords:	Geodynamics; subduction; Maule, Chile earthquake
Research affiliation:	OceanRep > GEOMAR OceanRep > SFB 574 > A1 OceanRep > SFB 574 OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Date Deposited:	10 Dec 2010 12:34
Last Modified:	23 Feb 2012 05:08
URI:	https://oceanrep.geomar.de/id/eprint/10421

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