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| Titel |
Bathymetry of the Indonesian Sunda margin-relating morphological features of the upper plate slopes to the location and extent of the seismogenic zone |
| VerfasserIn |
A. Krabbenhoeft, R. W. Weinrebe, H. Kopp, E. R. Flueh, S. Ladage, C. Papenberg, L. Planert, Y. Djajadihardja |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 10, no. 9 ; Nr. 10, no. 9 (2010-09-10), S.1899-1911 |
| Datensatznummer |
250008402
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| Publikation (Nr.) |
 copernicus.org/nhess-10-1899-2010.pdf |
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| Zusammenfassung |
| 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. |
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