HR: 0800h
AN: S31C-0555    [Abstracts]
TI: The Sunda-Banda Arc Transition: New Insights From Marine Wide-Angle Seismic Data
AU: Planert, L
EM: lplanert@ifm-geomar.de
AF: Leibniz Institute of Marine Sciences, IFM-GEOMAR, Wischhofstr. 1-3, Kiel, 24148, Germany
AU: Shulgin, A
EM: ashulgin@ifm-geomar.de
AF: Leibniz Institute of Marine Sciences, IFM-GEOMAR, Wischhofstr. 1-3, Kiel, 24148, Germany
AU: * Kopp, H
EM: hkopp@ifm-geomar.de
AF: Leibniz Institute of Marine Sciences, IFM-GEOMAR, Wischhofstr. 1-3, Kiel, 24148, Germany
AU: Mueller, C
EM: Christian.Mueller@bgr.de
AF: Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, Hannover, 30655, Germany
AU: Flueh, E
EM: eflueh@ifm-geomar.de
AF: Leibniz Institute of Marine Sciences, IFM-GEOMAR, Wischhofstr. 1-3, Kiel, 24148, Germany
AU: Lueschen, E
EM: Ewald.Lueschen@bgr.de
AF: Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, Hannover, 30655, Germany
AU: Engels, M
EM: Martin.Engels@bgr.de
AF: Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, Hannover, 30655, Germany
AU: Dayuf Jusuf, M
EM: dayuf@webmail.bppt.go.id
AF: Agency for the Assessment and Application of Technology (BPPT), Jl. M.H. Thamrin No. 8, Jakarta, 10340, Indonesia
AB: End of 2006, RV SONNE cruise SO190 SINDBAD (Seismic and Geoacoustic Investigations along the Sunda- Banda Arc Transition) went south of the Indonesian archipelago to acquire various geophysical datasets between 112 °E and 122 °E. The main goal of the project is to investigate the modifications of the lower plate (variability in the plate roughness, transition from oceanic to continental lower plate) and their effects on the tectonics of the upper plate (development of an outer high and forearc basin, accretionary and erosive processes). The tectonic style changes in neighboring margin segments from an oceanic plate-island arc subduction along the eastern Sunda margin to a continental plate-island arc collision along the Banda margin. Moreover, the character of the incoming oceanic plate varies from the rough topography in the area where the Roo Rise is subducting off eastern Java, to the smooth oceanic seafloor of the Argo- Abyssal Plain subducting off Bali, Lombok, and Sumbawa.
In order to cover the entire variations of the lower plate, seven seismic refraction profiles were conducted along four major north-south oriented corridors of the margin, at 113 °E, 116 °E, 119 °E, and 121 °E, as well as three profiles running perpendicular to the major corridors. A total of 239 ocean bottom hydrophone and seismometer deployments were successfully recovered. Shooting was conducted along 1020 nm of seismic profiles using a G-gun cluster of 64 l.
Here, we present velocity models obtained by applying a tomographic approach which jointly inverts for refracted and reflected phases. Additional geometry and velocity information for the uppermost layers, obtained by prestack depth migration of multichannel seismic reflection data (see poster of Mueller et al. in this session), is incorporated into our models and held fixed during the iterations.
UR: http://www.ifm- geomar.de/index.php?id=sindbad
DE: 0902 Computational methods: seismic
DE: 0935 Seismic methods (3025, 7294)
DE: 3002 Continental shelf and slope processes (4219)
DE: 3025 Marine seismics (0935, 7294)
DE: 3045 Seafloor morphology, geology, and geophysics
SC: Seismology [S]
MN: 2007 Fall Meeting