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Complex Morphology of Subducted Lithosphere in the Mantle below the Molucca Collision Zone from Non-linear Seismic Tomography
Sri Widiyantoro
Geodynamics Laboratory, Department of Geophysics and Meteorology, Faculty of Earth Sciences and Mineral Technology, Institut Teknologi Bandung, Indonesia
Abstract.
Consistent with earlier results, the new P-wave model depicts the two opposing subducted slabs of the Molucca Sea plate. The intriguing new observation is that the westward dipping slab appears to penetrate into the lower mantle by taking the form of folded slab. We envisage that the folding behavior may have been caused by the shift of the whole subduction system in the Molucca region toward the Eurasian continent due to the westward thrust of the Pacific plate combined with the large left-lateral movement of the Sorong fault. The inversion of travel-time residuals of direct S phases strongly confirms the new observation.
Keywords: Molucca; non-linear seismic tomography; P and S waves; slab folding.
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