Determining Soft Layer Thickness Using Ambient Seismic Noise Record Analysis in Kota Baru, South Lampung
The local site effect of an earthquake can be calculated through an analysis of short period ambient noise, known as microtremors. The fundamental frequency and amplification factors can be identified by analyzing microtremors using the Horizontal to Vertical Spectral Ratio (HVSR) method. This info...
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| Format: | Article |
| Language: | English |
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Universitas Indonesia
2019-03-01
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| Series: | Makara Journal of Science |
| Subjects: | |
| Online Access: | http://journal.ui.ac.id/index.php/science/article/view/10802/67546403 |
| _version_ | 1818314161751326720 |
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| author | Vico Luthfi Ipmawan Ikah N. P. Permanasari Rahmat Nawi Siregar |
| author_facet | Vico Luthfi Ipmawan Ikah N. P. Permanasari Rahmat Nawi Siregar |
| author_sort | Vico Luthfi Ipmawan |
| collection | DOAJ |
| description | The local site effect of an earthquake can be calculated through an analysis of short period ambient noise, known as microtremors. The fundamental frequency and amplification factors can be identified by analyzing microtremors using the Horizontal to Vertical Spectral Ratio (HVSR) method. This information can then be used to determine the thickness of the soft layers of sediment. This study analyzed microtremor recordings made in Kota Baru, South Lampung. The amplification factor range according to the HVSR method was 2.3 to 6.17, and the fundamental frequency range was 0.56 Hz to 1.46 Hz. Some spectrums exhibit two peaks with f0 > f1. We suggest that these locations have two layers with significant impedance contrast, which aligns with the geological conditions. The center of the Kota Baru area, especially the region around T11 and T15, has a thicker soft layer than the outskirts; in the central area, the soft layer is approximately 85 to 102 meters thick. The western part of the analyzed area has a shallower soft layer of about 32 to 46 meters. The analysis indicates that the western part has less amplification because it is shallower than the other parts of the analyzed region. |
| first_indexed | 2024-12-13T08:45:15Z |
| format | Article |
| id | doaj.art-3c8bba3480264383b44f7408c791440c |
| institution | Directory Open Access Journal |
| issn | 2339-1995 2356-0851 |
| language | English |
| last_indexed | 2024-12-13T08:45:15Z |
| publishDate | 2019-03-01 |
| publisher | Universitas Indonesia |
| record_format | Article |
| series | Makara Journal of Science |
| spelling | doaj.art-3c8bba3480264383b44f7408c791440c2022-12-21T23:53:28ZengUniversitas IndonesiaMakara Journal of Science2339-19952356-08512019-03-01231394310.7454/mss.v23i1.10802Determining Soft Layer Thickness Using Ambient Seismic Noise Record Analysis in Kota Baru, South LampungVico Luthfi Ipmawan0Ikah N. P. Permanasari1Rahmat Nawi Siregar2Department of Physics, Faculty of Sciences, Institut Teknologi Sumatera, Lampung 35365 IndonesiaDepartment of Physics, Faculty of Sciences, Institut Teknologi Sumatera, Lampung 35365 IndonesiaDepartment of Physics, Faculty of Sciences, Institut Teknologi Sumatera, Lampung 35365 IndonesiaThe local site effect of an earthquake can be calculated through an analysis of short period ambient noise, known as microtremors. The fundamental frequency and amplification factors can be identified by analyzing microtremors using the Horizontal to Vertical Spectral Ratio (HVSR) method. This information can then be used to determine the thickness of the soft layers of sediment. This study analyzed microtremor recordings made in Kota Baru, South Lampung. The amplification factor range according to the HVSR method was 2.3 to 6.17, and the fundamental frequency range was 0.56 Hz to 1.46 Hz. Some spectrums exhibit two peaks with f0 > f1. We suggest that these locations have two layers with significant impedance contrast, which aligns with the geological conditions. The center of the Kota Baru area, especially the region around T11 and T15, has a thicker soft layer than the outskirts; in the central area, the soft layer is approximately 85 to 102 meters thick. The western part of the analyzed area has a shallower soft layer of about 32 to 46 meters. The analysis indicates that the western part has less amplification because it is shallower than the other parts of the analyzed region.http://journal.ui.ac.id/index.php/science/article/view/10802/67546403amplificationfundamental frequencyhvsrlayer thicknesssediment |
| spellingShingle | Vico Luthfi Ipmawan Ikah N. P. Permanasari Rahmat Nawi Siregar Determining Soft Layer Thickness Using Ambient Seismic Noise Record Analysis in Kota Baru, South Lampung Makara Journal of Science amplification fundamental frequency hvsr layer thickness sediment |
| title | Determining Soft Layer Thickness Using Ambient Seismic Noise Record Analysis in Kota Baru, South Lampung |
| title_full | Determining Soft Layer Thickness Using Ambient Seismic Noise Record Analysis in Kota Baru, South Lampung |
| title_fullStr | Determining Soft Layer Thickness Using Ambient Seismic Noise Record Analysis in Kota Baru, South Lampung |
| title_full_unstemmed | Determining Soft Layer Thickness Using Ambient Seismic Noise Record Analysis in Kota Baru, South Lampung |
| title_short | Determining Soft Layer Thickness Using Ambient Seismic Noise Record Analysis in Kota Baru, South Lampung |
| title_sort | determining soft layer thickness using ambient seismic noise record analysis in kota baru south lampung |
| topic | amplification fundamental frequency hvsr layer thickness sediment |
| url | http://journal.ui.ac.id/index.php/science/article/view/10802/67546403 |
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