Bathymetry of the Indonesian Sunda margin-relating morphological features of the upper plate slopes to the location and extent of the seismogenic zone.

Krabbenhöft, Anne, Weinrebe, Reimer Wilhelm, Kopp, Heidrun , Flueh, Ernst R., Ladage, S., Papenberg, Cord , Planert, Lars and Djajadihardja, Y. (2010) Bathymetry of the Indonesian Sunda margin-relating morphological features of the upper plate slopes to the location and extent of the seismogenic zone. Open Access Natural Hazards and Earth System Sciences, 10 (9). pp. 1899-1911. DOI 10.5194/nhess-10-1899-2010.

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Abstract

Earthquake history shows that the Sunda subduction zone of the Indonesian margin produces great earthquakes offshore Sumatra, whereas earthquakes of comparable magnitude are lacking offshore Java and the Lesser Sunda islands. Morphological structures in multibeam bathymetric data across the forearc relate with the extent of the seismogenic zone. Its updip limit corresponds to the slope break, most distinct off Java and Lesser Sunda islands, where we find coincident narrow, uniform, continuous outer arc ridges. Their landward termination and a shallow upper plate mantle mark the downdip limit of the seismogenic zone. In contrast the outer arc ridges off Sumatra are wider and partly elevated above sea level forming the forearc islands. The downdip limit of the seismogenic zone coincides with a deeper upper plate mantle. Sunda Strait marks a transition zone between the Sumatra and Java margins. We find the differences along the Sunda margin, especially the wider extent of the seismogenic zone off Sumatra, producing larger earthquakes, to result from the interaction of different age and subduction direction of the oceanic plate. We attribute a major role to the sediment income and continental/oceanic upper plate nature of Sumatra/Java influencing the composition and deformation style along the forearc and subduction fault.

Document Type: Article
Keywords: Geodynamics; Indonesia, Sumatra, Java, Sunda, Bathymetry, Subduction Zone, Seismogenic Zone, Earthquakes, GITEWS special issue
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/nhess-10-1899-2010
ISSN: 1561-8633
Projects: Future Ocean
Date Deposited: 13 Sep 2010 08:42
Last Modified: 23 Sep 2019 16:44
URI: http://oceanrep.geomar.de/id/eprint/8895

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