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All Journal Jurnal RISET Geologi dan Pertambangan Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Ilham Arisbaya
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Chemistry Earth & Planetary Sciences Energy

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MODEL SISTEM PANAS BUMI LAPANGAN KARAHA - TALAGA BODAS BERDASARKAN INVERSI 2D DATA MAGNETOTELLURIK Ilham Arisbaya; Aldinofrizal Aldinofrizal; Yayat Sudrajat; Eddy Zulkarnaini Gaffar; Asep Harja
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 28, No 2 (2018)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1591.417 KB) | DOI: 10.14203/risetgeotam2018.v28.989

Abstract

Daerah Karaha-Talaga Bodas, yang terletak di kawasan Utara Gunung Galunggung, Tasikmalaya diduga memiliki prospek panas bumi, dengan adanya manifestasi permukaan berupa fumarol dan mata air panas. Metode Magnetotelurik (MT) diaplikasikan untuk mengidentifikasi struktur resistivitas bawah permukaan yang terkait dengan sistem panas bumi. Pengolahan data MT dilakukan melalui beberapa tahap, yaitu transformasi Fourier, seleksi crosspower, analisis rotasi, analisis kontak vertikal dan inversi dengan hasil akhir berupa model sebaran 2D. Hasil pengolahan data menunjukan adanya lapisan konduktif dengan nilai resistivitas 1-10 Ohm.m, yang diduga berperan sebagai lapisan penudung. Zona reservoir berupa daerah dengan nilai resistivitas 10-100 Ohm.m. Nilai resistivitas yang lebih besar dari 100 Ohm.m berkorelasi dengan batuan beku yang biasa dianggap sebagai sumber panas. Interpretasi hasil pengolahan data MT diintegrasikan dengan informasi geologi untuk mendapatkan gambaran sistem Panas Bumi Karaha-Talaga Bodas.The area of Karaha-Talaga Bodas, at the north of Mount Galunggung, Tasikmalaya, was expected to have a geothermal prospect due to several surface manifestations of fumaroles and hot springs. The Magnetotelluric method (MT) was then applied in this area to identify the subsurface resistivity structure related to the geothermal system. The MT data processing included Fourier transform, crossover selection, rotation analysis, vertical contact analysis, and inversion, with the result of a 2D resistivity model. The resistivity model indicated the existence of a conductive layer with the resistivity value of 1-10 Ohm.m, which could be a caprock. The reservoir zone is the area with the resistivity value of 10-100 Ohm.m. The resistivity value greater than 100 Ohm.m correlates with the basement, that acted as the heat source. Interpretation of the MT model was then integrated with the geological information to get an overview of the Karaha-Talaga Bodas geothermal system.
IMAGING TREE ROOT ZONE GEOMETRY USING ELECTRICAL RESISTIVITY TOMOGRAPHY Asep Mulyono; Ilham Arisbaya; Yayat Sudrajat
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 30, No 1 (2020)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/risetgeotam2020.v30.1074

Abstract

Root zone geometry research is usually done in a conventional way which is destructive, time-consuming, and requires a considerable cost. Several non-destructive measurements used geophysical methods have been developed, one of which is the Electrical Resistivity Tomography (ERT) method. Tree root zone determination using ERT has been carried out in Kiara Payung area, Sumedang, West Java, with Maesopsis eminii tree as the object study. A total of 29 ERT lines were measured using dipoledipole configuration with electrodes spacing of 50 cm. The results of two-dimensional (2D) and three-dimensional (3D) inversion modeling show that the ERT method has been successfully imaging the tree root zone. The root zone is characterized as 100-700 Ωm with an elliptical shape geometry of the root plate. The root radius is estimated to be 4-5 m from the stem, the root zone diameter reaches 8-9 m at the shallow soil surface and the root zone depth is approximately 2-2.5 m. ABSTRAK Pencitraan geometri zona perakaran pohon menggunakan electrical resistivity tomography. Penelitian geometri zona perakaran biasa dilakukan dengan cara konvensional yang destruktif, memakan waktu, dan membutuhkan biaya yang tidak sedikit. Beberapa pengukuran non-destruktif menggunakan metode geofisika telah dikembangkan, salah satunya adalah metode Electrical Resistivity Tomography (ERT). Penentuan zona perakaran pohon menggunakan metode ERT telah dilakukan di daerah Kiara Payung, Sumedang, Jawa Barat, dengan pohon Maesopsis eminii sebagai objek studi. Sebanyak 29 lintasan ERT diukur menggunakan konfigurasi dipole-dipole pada dengan jarak antar elektroda 50 cm. Hasil pemodelan inversi dua dimensi (2D) dan tiga dimensi (3D) menunjukkan bahwa metode ERT telah berhasil mencitrakan zona perakaran pohon. Zona perakaran teridentifikasi berada pada nilai resistivitas 100-700 Ωm dengan root plate dan root cross-sections berbentuk elips. Radius akar diperkirakan sejauh 4-5 m dari pangkal batang, sedangkan diameter zona perakaran mencapai sekitar 8-9 m di permukaan tanah dangkal dan kedalaman zona perakaran diperkirakan antara ~2-2.5 m. 
Termination of a Trench-Linked Strike-Slip Fault Zone in the Sumatra–Java Forearc Basin and Accretionary Wedge Complex Maruf M Mukti; Ilham Arisbaya; Haryadi Permana
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 4 (2020): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i4.492

Abstract

This paper presents a review of several published seismic reflection and seismicity data and analyzes of high-resolution bathymetry data to revise the exact location and reveal detail characteristics of a strike-slip fault zone that formed the southernmost segment of the Sumatran Fault (SF). Previous works interpreted this fault segment as a horst structure to the south of a pull-apart basin. We observe a clear linear trace of dissected seafloor parallels to SF in the high-resolution bathymetric map. This structure extends from the south of a pull-apart basin in the northwest to the Sunda accretionary wedge farther southeast. This lineament exhibits a narrow valley and a linear ridge that in the subsurface are interpreted as negative and positive flower structures, respectively. The structure exhibits a vertical fault plane and appears to have deformed the accretionary wedge sediments and basement at depth. A cluster of shallow seismicity is observed along this NW-trending fault zone, indicating the activity of this zone. Here, we proposed this strike-slip fault as the Ujung Kulon Fault that marks the southeasternmost segment of the SF zone. This segment deformed the area of the Sumatra-Java forearc basin and terminated in accretionary wedge near the trench. The accumulated strain within UKF may trigger large earthquake in the future, close to the highly populated areas in the coast of Sumatra and Java.Keywords: Strike-slip fault, Sumatra Fault, Ujung Kulon Fault, segmentation, earthquake.
Co-Authors Aldinofrizal Aldinofrizal Asep Harja Asep Mulyono Eddy Zulkarnaini Gaffar Haryadi Permana Maruf M Mukti Yayat Sudrajat Yayat Sudrajat