Crustal Structure Along Sunda-Banda Arc Transition Zone from Teleseismic Receiver Functions.

Autor: Anggono, Titi, Syuhada, Syuhada, Hananto, Nugroho Dwi, Abdullah, Chalid I., Puspito, Nanang T., Yudistira, Tedi
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Zdroj: Acta Geophysica; Dec2016, Vol. 64 Issue 6, p2020-2050, 30p
Abstrakt: 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. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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