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Surface Wave Tomography Using Seismic Ambient Noise Data for Subsurface Imaging beneath Bandung Basin, West Java and Its Surrounding

Dwi Wuryani S.a, Yudistira T.a, Widiyantoro S.a

a Master Program of Geophysical Engineering, Institut Teknologi Bandung, Bandung, 40132, 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 IOP Publishing Ltd. All rights reserved.Seismic interferometry was applied to estimate the shear wave velocity structure beneath the Bandung Basin, West Java. The empirical Green’s function (EGFs) were obtained by cross-correlate each pairs of seismic stations from the temporary seismic network installed in the research area. In this research, we use Rayleigh wave dispersion data as the input for surface wave tomography. The obtained dispersion curves of Rayleigh waves are in the period range 1 – 12 s. The dispersion characteristics of EGFs was also analyzed to estimate the distribution of the ambient noise sources. Based on the symmetricity characteristics of the dispersive signals of EGFs from all two station pairs oriented relatively in N-S and W-E the seismic noise sources was originated from oceanic activity at the Coastline of Java Sea. Furthermore, the dispersion curves also show that the group velocities vary within range of 1.6-2 km/s. The inverted dispersion data into depth models provide the variation of shear velocity structures at depth 1-5 km in the range of 1-2.1 km/s. At depth 1-4 km, there appear high and low velocity contrast in the south of Mt. Tangkuban Perahu, which is may be related to the existence of Lembang Fault. Meanwhile, velocity models at depth 1-3 km show the lateral variation of shear wave’s velocity in the Bandung Basin. The high velocity structures within range 1.8-2.1 km/s lies in the Southwest toward Northeast in the middle of Bandung Basin. This structures divide Bandung Basin into two parts, Western part and Eastern part.[/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]Dispersion characteristics,Dispersive signals,Empirical green’s functions,Rayleigh-wave dispersion,Seismic interferometries,Shear wave velocity structure,Sub-surface imaging,Surface-wave 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=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/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]The authors are is very grateful to Indonesia Endowment Fund of Education (LPDP) for the magister scholarship given to the author. The data we used here were Data of Portable seismometer installed independently by collaboration team of ITB, Meteorological, climatology and Geophysical Agency of Indonesia (BMKG) and Australian National University (ANU).[/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/10.1088/1755-1315/318/1/012032[/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]