Investigation of Hilbert–Huang Transform and Fourier Transform for Horizontal-to-Vertical Spectral Ratio Analysis: Understanding the Shallow Structure in Mataram City, Lombok, Indonesia
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...
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| Format: | Article |
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Frontiers Media S.A.
2020-08-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/article/10.3389/feart.2020.00334/full |
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| author | Mochammad Randy Caesario Harsuko Zulfakriza Zulfakriza Zulfakriza Zulfakriza Andri Dian Nugraha Andri Dian Nugraha Achmad Fajar Narotama Sarjan Sri Widiyantoro Sri Widiyantoro Sri Widiyantoro Shindy Rosalia Shindy Rosalia Nanang T. Puspito Nanang T. Puspito David P. Sahara |
| author_facet | Mochammad Randy Caesario Harsuko Zulfakriza Zulfakriza Zulfakriza Zulfakriza Andri Dian Nugraha Andri Dian Nugraha Achmad Fajar Narotama Sarjan Sri Widiyantoro Sri Widiyantoro Sri Widiyantoro Shindy Rosalia Shindy Rosalia Nanang T. Puspito Nanang T. Puspito David P. Sahara |
| author_sort | Mochammad Randy Caesario Harsuko |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-13T05:19:59Z |
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| id | doaj.art-9fab51e6f00546a6bf19b7650afa0301 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-13T05:19:59Z |
| publishDate | 2020-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-9fab51e6f00546a6bf19b7650afa03012022-12-21T23:58:21ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632020-08-01810.3389/feart.2020.00334560427Investigation of Hilbert–Huang Transform and Fourier Transform for Horizontal-to-Vertical Spectral Ratio Analysis: Understanding the Shallow Structure in Mataram City, Lombok, IndonesiaMochammad Randy Caesario Harsuko0Zulfakriza Zulfakriza1Zulfakriza Zulfakriza2Andri Dian Nugraha3Andri Dian Nugraha4Achmad Fajar Narotama Sarjan5Sri Widiyantoro6Sri Widiyantoro7Sri Widiyantoro8Shindy Rosalia9Shindy Rosalia10Nanang T. Puspito11Nanang T. Puspito12David P. Sahara13Graduate Program of Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Bandung, IndonesiaGlobal Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Bandung, IndonesiaCenter for Earthquake Science and Technology, Bandung Institute of Technology, Bandung, IndonesiaGlobal Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Bandung, IndonesiaCenter for Earthquake Science and Technology, Bandung Institute of Technology, Bandung, IndonesiaGraduate Program of Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Bandung, IndonesiaGlobal Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Bandung, IndonesiaCenter for Earthquake Science and Technology, Bandung Institute of Technology, Bandung, IndonesiaFaculty of Engineering, Maranatha Christian University, Bandung, IndonesiaGlobal Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Bandung, IndonesiaCenter for Earthquake Science and Technology, Bandung Institute of Technology, Bandung, IndonesiaGlobal Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Bandung, IndonesiaCenter for Earthquake Science and Technology, Bandung Institute of Technology, Bandung, IndonesiaGlobal Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Bandung, IndonesiaBecause 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.https://www.frontiersin.org/article/10.3389/feart.2020.00334/fullHilbert–Huang TransformHVSRMataram CityS-wave velocitynoise removalmicrotremor |
| spellingShingle | Mochammad Randy Caesario Harsuko Zulfakriza Zulfakriza Zulfakriza Zulfakriza Andri Dian Nugraha Andri Dian Nugraha Achmad Fajar Narotama Sarjan Sri Widiyantoro Sri Widiyantoro Sri Widiyantoro Shindy Rosalia Shindy Rosalia Nanang T. Puspito Nanang T. Puspito David P. Sahara Investigation of Hilbert–Huang Transform and Fourier Transform for Horizontal-to-Vertical Spectral Ratio Analysis: Understanding the Shallow Structure in Mataram City, Lombok, Indonesia Frontiers in Earth Science Hilbert–Huang Transform HVSR Mataram City S-wave velocity noise removal microtremor |
| title | Investigation of Hilbert–Huang Transform and Fourier Transform for Horizontal-to-Vertical Spectral Ratio Analysis: Understanding the Shallow Structure in Mataram City, Lombok, Indonesia |
| title_full | Investigation of Hilbert–Huang Transform and Fourier Transform for Horizontal-to-Vertical Spectral Ratio Analysis: Understanding the Shallow Structure in Mataram City, Lombok, Indonesia |
| title_fullStr | Investigation of Hilbert–Huang Transform and Fourier Transform for Horizontal-to-Vertical Spectral Ratio Analysis: Understanding the Shallow Structure in Mataram City, Lombok, Indonesia |
| title_full_unstemmed | Investigation of Hilbert–Huang Transform and Fourier Transform for Horizontal-to-Vertical Spectral Ratio Analysis: Understanding the Shallow Structure in Mataram City, Lombok, Indonesia |
| title_short | Investigation of Hilbert–Huang Transform and Fourier Transform for Horizontal-to-Vertical Spectral Ratio Analysis: Understanding the Shallow Structure in Mataram City, Lombok, Indonesia |
| title_sort | investigation of hilbert huang transform and fourier transform for horizontal to vertical spectral ratio analysis understanding the shallow structure in mataram city lombok indonesia |
| topic | Hilbert–Huang Transform HVSR Mataram City S-wave velocity noise removal microtremor |
| url | https://www.frontiersin.org/article/10.3389/feart.2020.00334/full |
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