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Al Rubaiyn
Jurusan Teknik Geologi, Universitas Halu Oleo
Computer Science & IT Earth & Planetary Sciences Engineering Physics

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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.
Co-Authors Jamhir Safani Khairul Anwar Wahyudhy