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Investigation of Hilbert–Huang Transform and Fourier Transform for Horizontal-to-Vertical Spectral Ratio Analysis: Understanding the Shallow Structure in Mataram City, Lombok, Indonesia
Harsuko M.R.C.a, Zulfakriza Z.a, Nugraha A.D.a, Sarjan A.F.N.a, Widiyantoro S.a,b, Rosalia S.a, Puspito N.T.a, Sahara D.P.a
a Graduate Program of Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Bandung, Indonesia
b Faculty of Engineering, Maranatha Christian University, Bandung, 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]© Copyright © 2020 Harsuko, Zulfakriza, Nugraha, Sarjan, Widiyantoro, Rosalia, Puspito and Sahara.Because of its robustness and practicality, the Horizontal-to-Vertical Spectral Ratio (HVSR) method has been widely used to obtain subsurface structure, mainly the sediment thickness that resides over bedrock. The method uses Fourier Transform to obtain frequency spectrum and calculate the H/V ratio. However, the conventional Fourier Transform method has some limitations; e.g., the inability to remove local noises that are very common in microtremor recordings. In this study, we investigate the application of the Hilbert–Huang Transform (HHT), in obtaining the HVSR curve, and compare it to the conventional method in terms of its effectiveness in removing local noise through the inversion results of HVSR curves. Such a comparison has never been conducted before. We used data from a microtremor survey in Mataram City, Lombok Island, Indonesia which experienced a series of destructive earthquakes in 2018. The results show that the S-wave velocity structure derived from the inversion process of the HHT-HVSR curves is in better agreement with the previous study of Mataram City than the conventional method. Furthermore, the resulting S-wave velocity structure is also interpreted based on geological reference, giving new insights into the subsurface structure beneath Mataram City.[/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][/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]Hilbert–Huang Transform,HVSR,Lombok Island,Mataram City,microtremor,noise removal,S-wave velocity[/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][{‘$’: ‘The authors are grateful to the Institute for Research and Community Service, Bandung Institute of Technology, and the Ministry of Research and Technology. Generic Mapping Tools (Wessel and Smith, 1998) were used to produce the figures. Funding. This work was supported by the Institute for Research and Community Service, Bandung Institute of Technology 2019 through a research grant from the Global Geophysics Research Group awarded to NP, and was partially supported by the Ministry of Research and Technology through SIMLITABMAS awarded to NP. Partially supported by ?Hibah Penelitian Dasar Unggulan Perguruan Tinggi, Kemenristek/BRIN 2019-2021?, Republic of Indonesia and ?Hibah Riset Institut Teknologi Bandung 2019-2020? awarded to AN.’}, {‘$’: ‘This work was supported by the Institute for Research and Community Service, Bandung Institute of Technology 2019 through a research grant from the Global Geophysics Research Group awarded to NP, and was partially supported by the Ministry of Research and Technology through SIMLITABMAS awarded to NP. Partially supported by “Hibah Penelitian Dasar Unggulan Perguruan Tinggi, Kemenristek/ BRIN 2019-2021”, Republic of Indonesia and “Hibah Riset Institut Teknologi Bandung 2019-2020” awarded to AN.’}, {‘$’: ‘The authors are grateful to the Institute for Research and Community Service, Bandung Institute of Technology, and the Ministry of Research and Technology. Generic Mapping Tools (Wessel and Smith, 1998) were used to produce the figures.’}][/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/10.3389/feart.2020.00334[/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]