Seismic rupture during the 1960 Great Chile and the 2010 Maule earthquakes limited by a giant Pleistocene submarine slope failure.

Geersen, Jacob M., Völker, David, Behrmann, Jan H., Kläschen, Dirk, Weinrebe, Wilhelm, Krastel, Sebastian and Reichert, Christian (2013) Seismic rupture during the 1960 Great Chile and the 2010 Maule earthquakes limited by a giant Pleistocene submarine slope failure. Terra Nova, 25 . pp. 472-477. DOI 10.1111/ter.12060.

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Abstract

Determining factors that limit coseismic rupture is important to evaluate the hazard of powerful subduction zone earthquakes such as the 2011 Tohoku-Oki event (Mw = 9.0). In 1960 (Mw = 9.5) and 2010 (Mw = 8.8), Chile was hit by such powerful earthquakes, the boundary of which was the site of a giant submarine slope failure with chaotic debris subducted to seismogenic zone depth. Here, a continuous décollement is absent, whereas away from the slope failure, a continuous décollement is seismically imaged. We infer that underthrusting of inhomogeneous slide deposits prevents the development of a décollement, and thus the formation of a thin continuous slip zone necessary for earthquake rupture propagation. Thus, coseismic rupture during the 1960 and 2010 earthquakes seems to be limited by underthrusted upper plate mass-wasting deposits. More generally, our results suggest that upper plate dynamics and resulting surface processes can play a key role for determining rupture size of subduction zone earthquakes

Document Type: Article
Additional Information: WOS:000326180500007
Keywords: seismicity, seismic segmentation, subduction earthquakes, rupture barrier, submarine landslide, seismic interface
Research affiliation: OceanRep > SFB 574 > A1
OceanRep > The Future Ocean - Cluster of Excellence > FO-R06
Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Geosciences
Kiel University > Kiel Marine Science
OceanRep > SFB 574
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1111/ter.12060
ISSN: 0954-4879
Projects: SFB574, Future Ocean
Contribution Number:
ProjectNumber
SFB 574239
Date Deposited: 24 Jul 2013 13:10
Last Modified: 04 Oct 2017 13:34
URI: http://oceanrep.geomar.de/id/eprint/21852

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