Crustal Structure Along Sunda-Banda Arc Transition Zone from Teleseismic Receiver Functions |
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| Authors: | Syuhada Syuhada Nugroho Dwi Hananto Chalid I Abdullah Nanang T Puspito Titi Anggono Tedi Yudistira |
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| Institution: | 1.Graduate Research on Earthquake and Active Tectonics (GREAT),Bandung Institute of Technology (ITB),Bandung,Indonesia;2.Research Centre for Physics — Indonesian Institute of Sciences (LIPI),Tangerang Selatan,Indonesia;3.Research Centre for Geotechnology — LIPI,Bandung,Indonesia;4.Faculty of Earth Sciences and Technology, ITB,Bandung,Indonesia;5.Faculty of Mining and Petroleum Engineering, ITB,Bandung,Indonesia |
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| Abstract: | We analyzed receiver function of teleseismic events recorded at twelve Indonesian-GEOFON (IA-GE) broadband stations using nonlinear Neighbourhood Algorithm (NA) inversion and H-k stacking methods to estimate crustal thickness, V p /V s ratios and S-wave velocity structure along Sunda-Banda arc transition zone. We observed crustal thickness of 34–37 km in Timor Island, which is consistent with the previous works. The thick crust (> 30 km) is also found beneath Sumba and Flores Islands, which might be related to the arc-continent collision causing the thickened crust. In Timor and Sumba Islands, we observed high V p /V s ratio (> 1.84) with low velocity zone that might be associated with the presence of mafic and ultramafic materials and fluid filled fracture zone. The high V p /V s ratio observed at Sumbawa and Flores volcanic Islands might be an indication of partial melt related to the upwelling of hot asthenosphere material through the subducted slab. |
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