Determining Soft Layer Thickness Using Ambient Seismic Noise Record Analysis in Kota Baru, South Lampung
Autor: | Rahmat Nawi Siregar, Vico Luthfi Ipmawan, Ikah N. P. Permanasari |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
Ambient noise level
0211 other engineering and technologies General Physics and Astronomy 02 engineering and technology Seismic noise amplification 010502 geochemistry & geophysics 01 natural sciences General Biochemistry Genetics and Molecular Biology General Materials Science fundamental frequency Soft layer lcsh:Science (General) 0105 earth and related environmental sciences 021110 strategic defence & security studies biology Spectral ratio Baru General Chemistry Fundamental frequency Amplification factor biology.organism_classification sediment hvsr layer thickness Microtremor General Agricultural and Biological Sciences Seismology Geology lcsh:Q1-390 |
Zdroj: | Makara Journal of Science, Vol 23, Iss 1, Pp 39-43 (2019) |
ISSN: | 2356-0851 2339-1995 |
Popis: | 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 f 0 > f 1 . 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. |
Databáze: | OpenAIRE |
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