Complex structure of the lithospheric slab beneath the Banda arc, eastern Indonesia depicted by a seismic tomographic model

  • Sri Widiyantoro | sriwid@geoph.itb.ac.id Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Bandung, Indonesia.
  • Jeremy D. Pesicek Department of Geoscience, University of Wisconsin-Madison, Madison WI, United States.
  • Clifford H. Thurber Department of Geoscience, University of Wisconsin-Madison, Madison WI, United States.

Abstract

Seismic tomography with a non-linear approach has been successfully applied to image the P-wave velocity structure beneath the Banda arc in detail. Nearly one million compressional phases including the surfacereflected depth phases pP and pwP from events within the Indonesian region have been used. The depth phases have been incorporated in order to improve the sampling of the uppermantle structure, particularly below the Banda Sea in the back-arc regions. For the model parameterization, we have combined a highresolution regional inversion with a low-resolution global inversion to allow detailed images of slab structures within the study region and to minimize the mapping of distant aspherical mantle structure into the volume under study. In this paper, we focus our discussion on the upper mantle and transition zone structure beneath the curved Banda arc. The tomographic images confirm previous observations of the twisting of the slab in the upper mantle, forming a spoon-shaped structure beneath the Banda arc. A slab lying flat on the 660 km discontinuity beneath the Banda Sea is also well imaged. Further interpretations of the resulting tomograms and seismicity data support the scenario of the Banda arc subduction rollback.

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Author Biographies

Sri Widiyantoro, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Bandung
Professor of Seismology
Jeremy D. Pesicek, Department of Geoscience, University of Wisconsin-Madison, Madison WI
Postdoctoral Fellow
Clifford H. Thurber, Department of Geoscience, University of Wisconsin-Madison, Madison WI
Professor of Geophysics
Published
2011-10-19
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Original Articles
Keywords:
Banda arc, non-linear seismic tomography, P-wave, subduction rollback, spoon-shape slab.
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How to Cite
Widiyantoro, S., Pesicek, J. D., & Thurber, C. H. (2011). Complex structure of the lithospheric slab beneath the Banda arc, eastern Indonesia depicted by a seismic tomographic model. Research in Geophysics, 1(1), e1. https://doi.org/10.4081/rg.2011.e1