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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS Jurnal Teras Fisika : Teori, Modeling, dan Aplikasi Fisika
Sukmaji Anom Raharjo
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Astronomy Energy Materials Science & Nanotechnology Physics

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Estimasi Kedalaman Bitumen Batubara di Desa Banjaran Kecamatan Salem Kabupaten Brebes Berdasarkan Data Anomali Magnetik Sehah S; Sukmaji Anom Raharjo; Adi Chandra
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 4, No 02 (2014): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v4i02.4986

Abstract

The Estimation of coal bituminous depth in Village of Banjaran, District of Salem, Regency of Brebes based on magnetic anomaly data has been done. The Village of Banjaran is located in the geology basin which called as Bentarsari Basin. The activities stages that carried out in this research include of magnetic data acquisition in the field, data processing, and interpretation. The interpretation of the anomalies data is done through the modeling using the Mag2DC for Window software on the local magnetic anomalies data. Based on this modeling results, then obtained six anomalous objects that can be interpreted as the subsurface rocks in the research area, which consists of sediments of gravel, sand, clay, and silt ( = 0.0020 cgs units); tuff and tuffaceous sandstone ( = 0.0069cgs units); andesite breccia, tuff, and tuffaceous sandstone ( = 0.0085cgs units); solid andesite breccia which not layered ( = 0.0115 cgs units); coarse sandstones, limestones, and sandy marl ( = 0.0109cgs units); andesite sandstone that layered with claystone and thin insertions of new coal bituminous alternately ( = 0.0008cgs units). Based on the modeling results and the geological information of this research area, it can be estimated that the coal bituminous found in the Kaliglagah formation, with its depths ranging between 104.48 m – 505.97m, and the value of the magnetic susceptibility is 0.0008 cgs units.
Inovasi pemanfaatan peta anomali pseudogravitasi untuk interpretasi pola sebaran batuan andesit masif di desa Candiwulan kecamatan Kutasari kabupaten Purbalingga dan sekitarnya Sehah Sehah; Sukmaji Anom Raharjo; Urip Nurwijayanto Prabowo
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 3 No 1 (2020): Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jtf.2020.3.1.2348

Abstract

Pemanfaatan peta anomali pseudogravitasi untuk menginterpretasi sebaran batuan andesit di Desa Candiwulan Kecamatan Kutasari Kabupaten Purbalingga dan sekitarnya telah dilakukan. Penelitian dilakukan pada bulan April hingga September 2019. Bahan dan peralatan yang diperlukan terdiri atas data anomali magnetik total, personal computer (PC), dan beberapa perangkat lunak seperti Fortran 77, Surfer 10, dan Arc-GIS 3.0. Jumlah data anomali magnetik total yang diperoleh adalah 142 data yang membentang pada posisi geografis 109,2788° – 109,3072° BT dan 7,3032° – 7,3319° LS dengan nilai berkisar -1,376.79 – 2,037.26 nT. Data anomali magnetik total selanjutnya diolah melalui beberapa tahap sehingga diperoleh data anomali magnetik lokal dengan nilai berkisar -1.238,13 – 1.892,4 nT. Pemfilteran terhadap data anomali magnetik lokal dilakukan untuk mereduksi efek-efek magnetik di permukaan sehingga diperoleh data anomali magnetik lokal baru dengan nilai berkisar -309.321 – 770.88 nT. Untuk melokalisir sumber anomali bawah permukaan, data anomali magnetik lokal baik sebelum maupun setelah difilter ditransformasi menjadi data anomali pseudogravitasi. Untuk data anomali magnetik sebelum difilter, diperoleh data anomali pseudogravitasi berkisar-75,992 – 119,498 mGal. Sedangkan untuk data anomali magnetik setelah difilter, diperoleh data anomali pseudogravitasi berkisar -27,815 – 41,087 mGal. Hasil interpretasi terhadap kedua peta anomali pseudogravitasi mengindikasikan adanya sumber anomali dangkal yang tersebar di bagian barat hingga barat laut daerah penelitian, dimana sumber anomali tersebut mengarah relatif ke bawah di bagian barat. Sumber anomali tersebut diinterpretasi sebagai batuan beku andesit yang masif
Identifikasi zona lemah pada ruas Jalan utama Ajibarang – Gumelar kabupaten Banyumas menggunakan metode geolistrik resistivitas Sehah Sehah; Tita Murwiyanti; Sukmaji Anom Raharjo
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 3 No 1 (2020): Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jtf.2020.3.1.2594

Abstract

Research using the geoelectric-resistivity method with Wenner configuration has been carried out to identify the subsurface rock structures especially weak zones on the part of main road of Ajibarang – Gumelar, Ajibarang District, Banyumas Regency. Resistivity data acquisition has been carried out on two trajectories with a length of each trajectory is 200 meters. The data acquired are the apparent resistivity values of subsurface rocks. The modeling results of apparent resistivity values in inversion have produced a two-dimensional (2D) cross section of subsurface rock resistivity. The interpretation results of the resistivity cross section have shown three layers of subsurface rocks consisting of fine to moderate grained sandstone with a resistivity value of 2.37 – 6.56 Ωm, limely marl with a resistivity value of 6.32 – 12.60 Ωm, and limestone with a resistivity value of 12.10 – 24.30 Ωm. The results of lithological interpretation of the resistivity cross section have shown the existence of a weak zone in this area at the measurement point about of 140 – 180 meters. The weak zone is interpreted as limestones and sandstones which have fine to moderate grain that is soft and not compact
Identifikasi struktur geologi bawah permukaan berdasarkan pemodelan 3D data gravitasi (studi kasus daerah potensi panas bumi Kepahiang) Sukmaji Anom Raharjo; Aditya Verry Saputra; Tony Rahadinata
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 5 No 2 (2022): Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jtf.2022.5.2.7248

Abstract

A survey of the gravity method in the Kepahiang geothermal potential area has been carried out, covering an area of ​​12×16 km2 with a total of 332 measurement data points. This study aims to identify the subsurface geological structure and the distribution of subsurface rock density associated with the hydrothermal system of the potential geothermal area. Modeling and identifying subsurface geological structures using derivative analysis can determine the type of fault structure produced by subsurface mass's vertical contact. The 3D modeling results show a block with a low-density value located in the hot spring area in a southwest direction. The low rock density is about 2.4 g/cm3 and is interpreted as pyroclastic rock undergoing weathering due to rising hydrothermal solutions. The modeling results also show a block of rock with high density, interpreted as a response to andesite rock, basalt, which is still compact and possible as a heat source for the Kepahiang geothermal area.
Pemodelan struktur bawah permukaan berdasarkan data anomali magnetik tereduksi ke kutub di kawasan prospek bijih emas desa paningkaban kecamatan Gumelar kabupaten Banyumas Syimah Nur Rahmah Shabrina; Muhammad Sehah; Sukmaji Anom Raharjo
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 6 No 1 (2023): Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jtf.2023.6.1.8038

Abstract

The research was carried out in the gold ore prospect area of ​​Paningkaban Village, Gumelar District, Banyumas Regency. This research aims to map magnetic anomaly data and model subsurface geological structures in two dimensions (2D) based on tilt derivative analysis of magnetic anomalies data which are reduced to the poles. The tilt derivative filter serves to reinforce the boundaries of geological structures, especially faults and intrusive rocks, thus facilitating the interpreting process of magnetic anomalies data. Magnetic field data processing is carried out to obtain local magnetic anomalies data. Furthermore, the local anomalies data are reduced to the poles, in order to obtain local magnetic anomalies data reduced to the poles with values ranging from -381.8 nT – 218.7 nT. Based on the tilt derivative analysis, the high-value anomaly contrast patterns are in the east - west direction. This can be interpreted as a pattern of distribution of fault structures and intrusive rock bodies in the research area which is a path of gold mineralization. 2D-modeling has been carried out using Geosoft Oasis Montaj v. 8.4 to obtain the subsurface geological structure model in the AA', BB', and CC' sections. The 2D-modeling results show that in the AA' section there is one andesitic intrusion, in the BB' section there are two andesite intrusions, and in the CC' section there are one intrusion and one fault. The intrusive rock is thought to be the location of gold mineralization.
Co-Authors Adi Chandra Aditya Verry Saputra Muhammad Sehah Sehah S Sehah Sehah Sehah Sehah Syimah Nur Rahmah Shabrina Tita Murwiyanti Tony Rahadinata Urip Nurwijayanto Prabowo