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All Journal IJOG : Indonesian Journal on Geoscience Journal of Science and Applicative Technology Indonesian Mining Journal Indonesian Journal on Geoscience Indonesian Journal on Geoscience International Journal of Hydrological and Environmental for Sustainability Makara Journal of Science Indonesian Mining Journal Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Vico Luthfi Ipmawan
Department Of Physics, Institut Teknologi Sumatera
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering

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Journal : Makara Journal of Science

 1 
Determining Soft Layer Thickness Using Ambient Seismic Noise Record Analysis in Kota Baru, South Lampung Ipmawan, Vico Luthfi; Permanasari, Ikah N. P.; Siregar, Rahmat Nawi
Makara Journal of Science Vol. 23, No. 1
Publisher : UI Scholars Hub

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Abstract

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.
Ambient Noise-Based Mapping of Bedrock Morphology and Potential Fissure Zone in East Tanjung Karang, Bandar Lampung, Lampung, Indonesia Ipmawan, Vico Luthfi; Permanasari, Ikah Ning Prasetiowati; Suhendi, Cahli
Makara Journal of Science Vol. 25, No. 2
Publisher : UI Scholars Hub

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Abstract

As a business center and the most populous subdistrict, East Tanjung Karang in Bandar Lampung, Lampung, Indonesia, is considered an area with excessive groundwater exploitation. This activity can trigger ground fissures that can consequently cause damage to buildings and roads. In this study, microtremor recordings from 17 sites were collected and analyzed by using the horizontal to vertical spectral ratio and ellipticity curve method. Results showed that the ground profiles of shear wave velocity from 17 sites ranged from 143.5 m/s to 1752.46 m/s, and they could be used to determine sediment layer and its thickness based on the SNI 1726-2012 criteria. The thickness of the bedrock varied from 8.18 m to 117.18 m. Bedrock morphology was obtained by subtracting the sediment thickness from the altitude value. The bedrock morphology and slope were then used to construct a potential fissure map of the area between Y16 and Y17 and between Y26 and Y27, which had high bedrock slopes (more than 45°). The ground fissure potential in these areas was higher than that in other areas. Such areas also had a geological hazard potential from ground fissures caused by excessive groundwater exploitation. Our study could be used by authorities as a basis for preventing subsidence-related disasters in this subdistrict.
Co-Authors Al Farishi, Bilal Al Hussein Flowers Rizqi Arimurti, Dyah Arum Berlian, Fitra Brotopuspito, Kirbani Sri Brotopuspito, Kirbani Sri Farid, Fajri firhad firmansyah Haerul Anwar Hendro Purnomo Herman, Sofiana Hetty Triastuty Hetty Triastuty Hetty Triastuty I. N. P. Permanasari Ikah N. P. Permanasari Iqbal, Mochamad Kirbani Sri Brotopuspito Kirbani Sri Brotopuspito Kirbani Sri Brotopuspito Radhitya, Berwyn Dzaky Rahmat Nawi Siregar Rizqi Prastowo Rofiqul Umam Setyo Pambudi Siregar, Rahmat Nawi Sriyakul, Thanaporn Suhendi, Cahli Triastuty, Hetty Triastuty, Hetty