The great Sumatra-Andaman earthquakes - Imaging the boundary between the ruptures of the great 2004 and 2005 earthquakes.

Franke, Dieter, Schnabel, Michael, Ladage, Stefan, Tappin, David R., Neben, Sönke, Djajadihardja, Yusuf S., Müller, Christian, Kopp, Heidrun and Gaedicke, Christoph (2008) The great Sumatra-Andaman earthquakes - Imaging the boundary between the ruptures of the great 2004 and 2005 earthquakes. Earth and Planetary Science Letters, 269 (1/2). pp. 118-130. DOI 10.1016/j.epsl.2008.01.047.

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Abstract

Segmentation along convergent margins controls earthquake magnitude and location, but the physical causes of segment boundaries, and their impact on earthquake rupture dynamics, are still poorly understood. One aspect of the 2004 and 2005 great Sumatra–Andaman earthquakes is their abrupt termination along a common boundary. This has led to speculation on the nature of the boundary, its origin and why it was not breached.

For the first time the boundary has been imaged and, with newly acquired marine geophysical data, we demonstrate that a ridge on the subducting Indo-Australian oceanic crust may exert a control on margin segmentation. This suggests a lower plate influence on margin structure, particularly its segmentation. The ridge is masked by the sedimentary cover in the trench. Its most likely trend is NNE–SSW. It is interpreted as a fracture zone on the subducting oceanic plate. A ramp or tear along the eastern flank of the subducting fracture zone beneath Simeulue Island may be considered as an intensification factor in terms of rupture propagation barrier.

Document Type: Article
Keywords: Subduction, Earthquakes, segmentation, seismic data, Sumatra
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.epsl.2008.01.047
ISSN: 0012-821X
Projects: Future Ocean
Date Deposited: 03 Dec 2008 16:51
Last Modified: 23 Sep 2019 21:55
URI: http://oceanrep.geomar.de/id/eprint/4538

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