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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS JAGAT (Jurnal Geografi Aplikasi dan Teknologi) Jurnal Rekayasa Geofisika Indonesia Jurnal Rekayasa Geofisika Indonesia
Jamhir Safani
Dept. Of Geophysical Engineering, Faculty Of Mathematics And Natural Sciences, Universitas Halu Oleo
Agriculture, Biological Sciences & Forestry Astronomy Computer Science & IT Earth & Planetary Sciences Energy Engineering Materials Science & Nanotechnology Physics Other

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Pemodelan Basement Daerah Panas Bumi Non Vulkanik Lainea Konawe Selatan Berdasarkan Data Anomali Medan Gravitasi Wahyudhy; Jamhir Safani; Al Rubaiyn
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.v5i01.12

Abstract

Basement rocks often consist of relatively older, denser, and different-density rocks compared to the overlying rock layers. These density variations create gravity anomalies that can be observed and analyzed using gravity methods. Basement modeling implementation can be utilized for geothermal exploration. In the Lainea , Southeast Sulawesi, there is geothermal potential. While some research has been conducted, no studies on basement modeling have been found. Therefore, to enrich the study, this research performs 3D basement modeling in the Lainea area based on gravity measurement data. The modeling is carried out using the Grav_D_Inv inversion program, utilizing residual gravity anomalies from complete Bouguer anomalies. The program runs on MATLAB with a graphical user interface (GUI) and relies on several parameters, including anomaly depth estimation, area size, wavenumber range for low-pass filters, density contrast, and windowing. The inverted basement in the Lainea geothermal area, integrated with geological and previous geophysical studies, can be interpreted as metamorphic rocks with intrusive igneous rocks in the central area. The Lainea geothermal basement relief tends to follow surface structural and topographic patterns, displaying intrusive structures at depths of 1200 - 1500 meters with a peak area in the southeast region of the research area.
Analisis Tingkat Seismisitas dan Percepatan Tanah Maksimum (PGA) Wilayah Sulawesi Tenggara Berdasarkan Data Gempabumi Periode 1973-2022 Al Rubaiyn; Jamhir Safani; Khairul Anwar
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.v5i02.17

Abstract

Abstract. An analysis of seismicity level and maximum ground acceleration of Southeast Sulawesi region has been conducted. The purpose of this research is to map the level of rock fragility (b value), seismicity level (a value), and maximum ground acceleration (PGA) of Southeast Sulawesi. The earthquake data used is sourced from USGS and BMKG for the period 1973-2022. Zmap software was used to calculate a value and b value. PGA from accelerograph data was used to find a suitable empirical method to calculate the PGA of Southeast Sulawesi. The selection of a suitable method is based on the smallest average error value. Based on the analysis results obtained, the value of rock fragility level ranges from 0.355-1.337 while the seismicity level ranges from 2.773-7.879 with the highest value is in the southeast area of Southeast Sulawesi. The comparison results of PGA values from accelerograph data and empirical methods show that the Liu & Tsai method has the lowest RMSE of 5.27 gal. Liu & Tsai's PGA values for Southeast Sulawesi ranged from 18.6-155.7 gal.
Identifikasi Konfigurasi Struktur Geologi Bawah Permukaan Berdasarkan Data Anomali Medan Gravitasi dengan Teknik Deteksi Tepi dan Dekonvolusi Euler di Daerah Panas Bumi Lainea Nursinta Atsaniyah Misquita; Jamhir Safani; Al Rubaiyn
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.v6i01.61

Abstract

this research is located in Lainea District, Lainea Village, Southeast Sulawesi, which aims to determine the subsurface structure based on the edge detection technique and determine the depth of the anomaly source using euler deconvolution. Fault segmentation with varying trends and depths illustrates the complexity of tectonic activity around the research area. The application of several edge detection techniques to the residual anomaly data shows the superiority of the TAHG approach in identifying the edges of geothermal source zones and the alignment of geological structures while the TDX approach only shows the boundaries of the anomalies. The euler deconvolution depth solution shows that the faults generated from the TAHG approach belong to shallow faults.
Interpretasi Data Mikrotremor Melalui Analisis Horizontal To Vertical Spectral Ratio (HVSR) untuk Mikrozonasi Bahaya Gempa Seismik di Kota Baubau Rudin; Jamhir Safani
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.v6i02.92

Abstract

Research has been carried out on seismic hazard microzonation in the city of Bau – bau using microtremor data. The aim of this research is to determine the seismic vulnerability index based on horizontal to vertical spectral ratio (HVSR) analysis and create a dominant frequency microzonation map (F0), dominant period map (T0), amplification factor map (A0), and seismic vulnerability index map (Kg) from microtremor data which can describe the level of vulnerability of an area to seismic hazards. Microtremor measurements were carried out using a portable three-component seismograph (TDS. 303), the data was analyzed with gepsy software via the HVSR method. The research results show that the distribution of dominant frequency values ​​(F0), ranges from 0.4795 Hz to 16.6383 Hz, dominant period values ​​(T0), ranges from 0.0601 seconds to 2.0854 seconds, amplification factor values ​​(A0), ranges from 1.2285 to 4.9043, and the seismic vulnerability index (Kg) value ranges from 0.1043 to 11.0276. The values ​​(F0), (T0), (A0), and (Kg) are interpreted by referring to literature data and surface geological maps of the research area. The results show that the study area has a small portion of sediment layers that are vulnerable to seismic hazards.
A Weighted Average of Multiple Inversions of Rayleigh Wave Dispersion Curve Using Particle Swarm Optimization for Geotechnical Site Characterization Jamhir Safani; Rezki Wirawan; Al Rubaiyn Rubaiyn; Mohd Nawawi; Toshifumi Matsuoka
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 2 (2023): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i2.77921

Abstract

Shear wave velocity is an important parameter in geotechnical engineering for studying liquefaction, finding bedrock for the basement of a building, and figuring out the presence of subsurface cavities. This study aims to develop and evaluate the accuracy of the multiple inversions by the Particle Swarm Optimization (MI-PSO) algorithm with a weighted average solution. This algorithm is applied to Rayleigh wave dispersion data for geotechnical site characterization. Two synthetic models, the HVL model and the complex model (i.e., a combination of models with LVL and HVL characteristics), are used to conduct algorithm tests. These synthetic models replicate subsurface characteristics that are frequently encountered in geotechnical cases. Synthetic data tests show that the MI-PSO algorithm with a weighted average solution works excellently. The MI-PSO technique with a weighted average solution resolves the model better than the conventional average solution. When applied to two field data sets, the MI-PSO algorithm with a weighted average solution can delineate target models that are consistent with the qualitative interpretation based on the observed dispersion curve characteristics.
Estimation of Tsunami Hazard and Evacuation Sites using The Cornell Multigrid Couple Tsunami Method in South Button Regency Ilham Ilham; Jamhir Safani; Muliddin Muliddin; Teguh Sulistian; Sorja Koesuma
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 1 (2025): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i1.97008

Abstract

The 1992 earthquake and tsunami in the Flores Sea proved that the tsunami impacted the people of the South Buton Region. This research aims to map tsunami hazards and estimate evacuation routes and sites in the South Buton Regency. These evacuation routes and sites are very crucial for disaster preparedness and reducing the risk of tsunami disasters. This research simulates the tsunami wave hazard from the 1992 Flores earthquake using the Cornell multigrid coupled tsunami (COMCOT). We designed the study area in five layers and seven sublayers, encompassing 13 villages on the coast of South Buton Regency. The research generated seven tsunami hazard maps based on the number of existing sublayers, each equipped with evacuation routes and locations. In general, the seven study areas have two tsunami hazard levels: a hazard level with an inundation height of less than 0.5 m and a hazard level with an inundation height of 0.5–3 m. The tsunami inundation distance for the height of 0.5-3 m varies. The shortest inundation distance is 5–33 m in Lakambau and Laompo Villages, while the farthest distance is 57–98 m in Katampe, Lamaninggara, and Molona Villages. Apart from that, the tsunami wave arrived around 35–45 minutes after the earthquake. The fastest arrival time is 35 minutes in Bahari Village, which is closest to the source of the tsunami. The results of the study recommend 17 temporary evacuation sites (TES) and 7 final evacuation sites (FES) in the research area.
Estimasi Sistem Perlapisan pada Blok-A Area Panas Bumi Lainea Konawe Selatan Menggunakan Vertical Electrical Sounding (Ves) Konfigurasi Schlumberger Syafira Mpuhu; Jamhir Safani; Syamsul Razak Haraty
Jurnal Rekayasa Geofisika Indonesia Vol. 7 No. 02 (2025): 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.v7i02.19

Abstract

This research aims to estimate the layering system in the Lainea Geothermal area in South Konawe Regency. The apparent resistivity data obtained from the Pusat Sumber Daya Geologi (PSDG) measured in 2010 using the Schlumberger configuration was inversed with the particle swarm optimization (PSO) method. From the results of data inversion at both sounding points, it was found that there are five layers with different resistivity ranges. The first layer is a thin overburden near the surface with a thickness of 0.5 - 0.7m. The second layer is thought to be conglomerate rock. The third layer is interpreted as cap-rock with meta-sandstone lithology with a resistivity value range of 126.3<ρ<366 Ωm. The fourth layer with sandstone lithology is closely suspected as a fluid accumulation zone with a resistivity value range of 45.4<ρ<69 Ωm. The lowest layer with a resistivity value range of 261<ρ<500 Ωm is interpreted as metamorphic rock which is thought to act as an impermeable layer.
Identifikasi Sistem Perlapisan Blok – B Area Panas Bumi Lainea Konawe Selatan Menggunakan Metode Vertical Electrical Sounding (Ves) Konfigurasi Schlumberger Annisa Tiara Saputri; Jamhir Safani; Syamsul Razak Haraty
Jurnal Rekayasa Geofisika Indonesia Vol. 8 No. 01 (2026): Edisi April 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.v8i01.20

Abstract

Gravity forward modeling based on the Last–Kubik kernel requires intensive computation as the number of model blocks and observation points increases. This study analyzes the computational performance of Full Vectorization (FV) compared with Nested Loop (NL) without modifying the mathematical formulation of the Last–Kubik kernel. Experiments were conducted using synthetic models with 20 configurations ranging from 20,000 to 168,200 blocks. Algorithm performance was evaluated based on gravity-response consistency, computational time, and memory usage. Computational time was assessed using Total Execution Time (TET) and Mean Core Computational Time (MCCT) from 30 repetitions, while memory usage was evaluated using Kernel Workspace Memory Increase (KWMI). The results show that the FV and NL implementations produce numerically identical gravity responses, with a maximum absolute difference of 0 for the tested configurations. FV provides an MCCT speedup of approximately 6–7 times for small to medium-sized models, but the speedup decreases to 1.56 times at 168,200 blocks. In contrast, FV requires approximately 18 times more memory than NL. Regression analysis shows a very strong linear relationship between KWMI and the number of observation–block pairs. The results demonstrate that FV effectively accelerates gravity forward modeling but has scalability limitations due to its substantially higher memory requirements
Estimasi Model 3D Antar-Muka Basement Kawasan Panas Bumi Lainea-Konawe Selatan Berdasarkan Anomali Medan GravitASI Data GGMPLUS Andre Nico Carli Silalahi; Jamhir Safani; Al Rubaiyn
Jurnal Rekayasa Geofisika Indonesia Vol. 7 No. 03 (2025): Edisi Desember 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.v7i03.63

Abstract

This research was conducted in the South Konawe area, especially in other geothermal using satellite image data, namely the Global Gravity Model Plus (GGMPlus) which has been developed with high resolution and a distance between points of -220m. Several studies have been conducted basement 3D modeling using measurement data but have not found basement 3D modeling in the Lainea area based on GGmplus data.Gravity data modeling (residual anomaly) was inverted using the GRAV_D_In-based MATLAB program. The Grav_D_In program requires several parameters, namely anomaly depth estimation, area area, wavenumber range for low-pass filters, density contrast, and widowing. The result of the inversion of the basement interface 3D model has a depth ranging from 980m to 1540m. The results of the basement contour pattern overlay with the structural pattern show that the structural pattern partially follows the basement contour pattern. An overlay of the basement model of the study was carried out using field data in the topography, that the basement model intersected in the use of satellite image data with measurements. The second basement pattern intersects but has different depths
Co-Authors Al Rubaiyn Al Rubaiyn Andre Nico Carli Silalahi Annisa Tiara Saputri Anshari, Erwin Asniar Asniar ILHAM ILHAM Ilham Ilham Irawati Irawati Khairul Anwar La Hamimu Mohd Nawawi Muhammad Ichsanul Akbar Natsir Muhammad Nur Ahsan Zakir Muliddin Nur Salam Nursinta Atsaniyah Misquita Rezki Wirawan Rudin Sorja Koesuma Stefanus Indra Fernando Darius Suryawan Asfar Syafira Mpuhu Syamsul Haraty Syamsul R Haraty Syamsul Razak Haraty Teguh Sulistian Tian Aprilia Aksa Mahadi Toshifumi Matsuoka Wa Ode Nurfadilah Wahyudhy