Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 10 9 2010 10.5194/nhess-10-1899-2010 http://www.nat-hazards-earth-syst-sci.net/10/1899/2010/ http://www.nat-hazards-earth-syst-sci.net/10/1899/2010/nhess-10-1899-2010.html http://www.nat-hazards-earth-syst-sci.net/10/1899/2010/nhess-10-1899-2010.pdf 1899 1911 2010-09-10 Bathymetry of the Indonesian Sunda margin-relating morphological features of the upper plate slopes to the location and extent of the seismogenic zone A. Krabbenhoeft akrabbenhoeft@ifm-geomar.de R. W. Weinrebe H. Kopp E. R. Flueh S. Ladage C. Papenberg L. Planert Y. Djajadihardja Leibniz Institute of Marine Sciences at Kiel University (IFM-GEOMAR), Wischhofstr. 1–3, 24149 Kiel, Germany Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, 30655 Hannover, Germany Agency for the Assessment and Application of Technology, J1. M.H. Thamrin No. 8, Jakarta 10340, Indonesia 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. 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