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Shear wave velocity structure beneath Bandung basin, West Java, Indonesia from ambient noise tomography
Pranata B.a,b, Yudistira T.a, Widiyantoro S.a, Brahmantyo B.a, Cummins P.R.c, Saygin E.d,e, Zulfakriza Z.a, Rosalia S.a, Cipta A.f
a Study Program of Earth Sciences, Faculty of Earth Science and Technology, Institut Teknologi Bandung, Bandung, 40132, Indonesia
b Agency for Meteorology Climatology and Geophysics (BMKG), Jakarta, 10720, Indonesia
c Research School of Earth Sciences, Australian National University, Canberra, 2601, Australia
d Deep Earth Imaging Future Science Platform, CSIRO, Australian Resources Research Centre, Kensington, 6151, Australia
e Department of Physics, School of Physics, Mathematics and Computing, Faculty of Engineering and Mathematical Sciences, University of Western Australia, Perth, 6009, Australia
f Center for Volcanology and Geological Hazard Mitigation, Geological Agency, Bandung, 40122, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2019 The Author(s). Published by Oxford University Press on behalf of The Royal Astronomical Society.We investigated the seismic shear wave velocity structure of the upper crust beneath the Bandung area in West Java, Indonesia, using ambient seismic noise tomography. We installed 60 seismographs to record ambient seismic noise continuously in the city of Bandung and its surrounding area for 8 months. After interstation cross-correlation of recordings of ambient seismic noise, we obtained empirical Green’s functions for Rayleigh waves. Group velocity dispersion curves for Rayleigh waves between periods of 1 and 8 s were measured on each interstation path by applying the multiple filter analysis method with phase-matched processing. The spatial variation of group velocities shows a good correlation with the geological structure of the Bandung Basin. The Rayleigh wave dispersion maps were inverted to obtain the 1-D shear wave velocity profiles beneath each station, which were interpolated to infer a pseudo-3-D structure under the study region. The results show that the Bandung Basin has a thick layer of sediment. Along the northern, eastern and southern mountains surrounding the Bandung Basin there is high-velocity structure, except to the west of the Tangkuban Parahu volcano, where a massive low-velocity structure extending throughout the upper crust might indicate the presence of fluids or partial melts.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Ambient noise tomographies,Ambient seismic noise,Empirical green’s functions,Geological structures,Group velocity dispersion curve,Multiple filter analysis,Rayleigh-wave dispersion,Shear wave velocity structure[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Asia,Basin,Crustal Structure,Tomography[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text]BP is very grateful to BMKG for a doctoral scholarship during his study at the Institut Teknologi Bandung (ITB). The data used in this study were acquired using the research funding from the Australian Research Council Linkage Project LP110100525, partially supported by the Australian Aid program of the Australian Dept. Foreign Affairs and Trade. This study was also partially funded by the Indonesian Ministry of Research, Technology and Higher Education under WCU Program 2019 managed by ITB awarded to S. Widiyantoro. We thank A. Morelli, S. Schippkus and an anonymous reviewer for helpful comments and suggestions that improve the manuscript considerably. We used the Generic Mapping Tools (Wessel & Smith 1998) and Quantum GIS (https://qgis.org)tocreate figures presented in this study.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1093/gji/ggz493[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]