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La Hamimu Hamimu
Jurusan Teknik Geofisika, Universitas Halu Oleo
Computer Science & IT Earth & Planetary Sciences Engineering Physics

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Identifikasi Potensi Tingkat Kerusakan Gempabumi Berdasarkan Indeks Kerentanan Seismik Menggunakan Metode Hvsr di Kecamatan Kadia Kota Kendari La Hamimu Hamimu; Abdul Manan; Risky Ramadhani
Jurnal Rekayasa Geofisika Indonesia Vol. 5 No. 01 (2023): Edisi April Jurnal Rekayasa Geofisika Indonesia (JRGI)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v5i01.16

Abstract

This research was conducted to identify the potential level of earthquake damage in Kadia District, Kendari City. The potential level of damage is known based on the seismic vulnerability index parameter. The data used is microtremor data obtained from the results of the frequency filtering process of ground vibration data using a Band Pass Filter type with a frequency range of 1.00 to 25.00 Hz. While the ground vibration data was obtained from the results of direct measurements in the field at 16 measurement points using 1 set of portable seismograph TDL 303S. Furthermore, the data is processed using the Horizontal to Vertical Spectral Ratio (HVSR) method to produce the dominant frequency of the soil and the amplification factor used to calculate the seismic vulnerability index. From the results of data processing carried out scientifically in Kadia District, Kendari City, a seismic vulnerability index value was obtained with values ranging from 0.761 to 5.292 /cm. Based on the results of mapping of the potential level of earthquake damage obtained from the results of the seismic vulnerability index value, it shows that Kadia District, Kendari City has a low to moderate potential for damage due to earthquakes. Low zones with seismic vulnerability index values ​​< 3 are scattered in Kadia, Bende, Anaiwoi, and Wowawanggu Villages. Moderate zones with seismic vulnerability index values ​​< 3 to 6 are scattered in Kadia, Pondambea, and Bende Villages.
Identifikasi Ketebalan Lapisan Sedimen Menggunakan Data Mikrotremor Di Kecamatan Kadia Kota Kendari La Hamimu Hamimu; Agnes Maindan; Abdul Manan
Jurnal Rekayasa Geofisika Indonesia Vol. 5 No. 02 (2023): Edisi Agustus Jurnal Rekayasa Geofisika Indonesia (JRGI)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v5i02.21

Abstract

This study aims to determine the value of the distribution of sediment layer thickness. This research was conducted in the Kadia District area, Kendari City, with data collection carried out at 16 measurement points with intervals for each point varying from 400 to 600 meters with a sampling frequency of 100 Hz. The data obtained from this study is in the form of ground vibration data which is then downloaded software DataPro.exe East-Westhorizontal component, the North-South vertical component Up-Down. The downloaded microtremor data is then processed using a device software Geopsy 4.3.2 to obtain the H/V curve. The dominant frequency value (f0) is obtained from the H/V curve with a dominant frequency range of 1.247 Hz to 4.955 Hz and the shear (VS30) is obtained from the website www.USGS.gov with a VS30 of 276 m/s up to 301 m/s. Based on the data that has been obtained, the distribution value of the sediment layer thickness (h) will be determined. The value of the thickness of the sediment layer (h) in the study area ranged from 13,016 meters to 59,473 meters.
Analisis Ketebalan Lapisan Sedimen Menggunakan Metode Horizontal to Vertical Spectral Ratio (HVSR) di Daerah Perbukitan Kecamatan Moramo La Hamimu Hamimu; Laode Ihksan Juarzan; Nurul Irana Pathiasari
Jurnal Rekayasa Geofisika Indonesia Vol. 6 No. 01 (2024): Edisi Arpil JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v6i01.29

Abstract

This research aims to determine value of the thickness of sediment layer (h) and the type of soil layer in the hilly area of Moramo District. This research uses microtremor data obtained from the TDL-303S Seismometer at 15 points with a distance between points of 400 m–800 m and shear wave velocity values up to a depth of 30 m (Vs30) obtained from USGS website data. Microtremor data were analyzed using HVSR method with Geopsy 3.4.2 software to obtain the dominant frequency value. The shear wave velocity value was extracted using ArcGis 10.8 software to determine Vs30 value at each measurement point. The f0 and VS30 values are used to determine the sediment layer thickness (h). The analysis results show that sediment layer thickness range between 5,03 m–47,43 m. The distribution map of sediment layer thickness values shows that research area with high sediment layer thickness values is located in a small part of Ulusena Village and Watu Porambaa Village. So, these two areas are at greater risk of experiencing damage due to earthquakes. The type of soil layers based on soil classification by Kanai (1983) are classified into 4 types of soil with the research area being dominated by Type I soil, where this type is tertiary or older rock consisting of hard gravelly sandstone. Type I is located in Wonua Jaya Village, the western and southern parts of Sumbersari Village, the eastern part of Pudaria Jaya Village, as well as small parts of Watu Porambaa and Ulusena Village.
Implementasi Matrix Laboratory Dalam Pengolahan Data Mikrotremor Menggunakan Metode Hvsr: Studi Kasus Di Daerah Pesisir Kecamatan Moramo Sitti Fauziah Faradilla; La Hamimu Hamimu; Laode Ihksan Juarzan
Jurnal Rekayasa Geofisika Indonesia Vol. 6 No. 02 (2024): Edisi Agustus JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Program Studi Teknik Geofisika FITK UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/jrgi.v6i02.48

Abstract

Vibration characteristics in a region of the earth are strongly influenced by unique physical and geological parameters, resulting in diverse responses to natural and anthropogenic disturbances. This research not only contributes to the understanding of geology and vibration response, but also presents a methodology that can be widely applied in passive seismic research. The analysis method in this study uses MATLAB programming language for microtremor signal processing. The algorithm of this research is able to produce a model that reveals the frequency and statistical characteristics of the microtremor signal, the output is quite similar to the open-source software GEOPSY in HVSR processing. There are 15 research data with type .msd as a representation of 15 measurement points scattered in Moramo sub-district. The statistics obtained show that the dominant ground frequency (F0), amplification factor (A0), and seismic susceptibility index (Kg) in the Coastal Land of Moramo Subdistrict range from 0.519792 - 14.692654 Hz, 2.250096 - 6.370357 times amplification, and 0.500194 - 50.516144 s²/cm, respectively. These results are quite similar to previous research by RIVAL (2023) who used GEOPSY software as his analysis tool. The statistical distribution in the form of dominant frequency (F0), amplification (A0) and seismic susceptibility index (Kg) were then interpolated and overlaid with the geodata of the study area using the Mapping Toolbox which is also in the MATLAB environment.
Co-Authors Abdul Manan Agnes Maindan Laode Ihksan Juarzan Nurul Irana Pathiasari Risky Ramadhani Sitti Fauziah Faradilla