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kusuma dewi, ira
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Physics

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GEOPHYSICAL INVESTIGATION OF GEOTHERMAL MANIFESTATION IN SUNGAI MEDANG USING ELECTRICAL RESISTIVITY AND GRAVITY METHODS Resta, Ichy Lucya; Mahardika, Rizky; M.Z, Nazri; Hamdi, Husnul; Kusuma Dewi, Ira; Andriani, Aulia
JOURNAL ONLINE OF PHYSICS Vol. 10 No. 2 (2025): JOP (Journal Online of Physics) Vol 10 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v10i2.43467

Abstract

This study investigates the geothermal manifestation in Sungai Medang, located within a volcanic arc depression zone of the Sungai Penuh Basin, formed by right-lateral movement along the segmented Siulak Fault. The exploration approach combined electrical resistivity and gravity methods to delineate subsurface features associated with hydrothermal activity. The electrical resistivity survey employed a dipole–dipole configuration with 25-meter spacing over a 400-meter line and the complementary gravity data from the Topex/Poseidon satellite altimetry were processed into Simple Bouguer Anomaly (SBA) maps. Resistivity survey revealed low-resistivity zones (11.6–99.1 Ωm), interpreted as hydrothermal fluid pathways and altered volcanic formations aligned with known fault traces, particularly the Siulak Fault segment. The gravity data indicated NW–SE trending density contrasts. Spectral analysis identified residual anomalies (~1.5 km depth) consistent with shallow sedimentary infill and structural depressions, while deeper regional anomalies (~38.7 km) reflected basement variations. The spatial correlation of resistivity lows, gravity lows, and surface manifestations suggests active geothermal upflow along structurally controlled zones. This study highlights the importance of integrating geophysical datasets for geothermal resource evaluation and offers a methodological framework applicable to similar underexplored regions in Indonesia and beyond.
ANALISIS KERENTANAN TANAH FAKULTAS SAINS DAN TEKNOLOGI UNIVERSITAS JAMBI DENGAN MENGGUNAKAN DATA MIKROTREMOR Kusuma Dewi, Ira; Lucya Resta, Ichy; Sucitra Amin, Sarwo; Nuklirullah, Nuklirullah; Juventa, Juventa; Situmorang, Salomo; Fitri Ramadhani, Amelia
JOURNAL ONLINE OF PHYSICS Vol. 9 No. 1 (2023): JOP (Journal Online of Physics) Vol 9 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v9i1.28788

Abstract

Research has been carried out to carry out soil vulnerability analysis at the Faculty of Science and Technology, Jambi University. The construction of buildings at the Faculty of Science and Technology has necessitated an analysis of the vulnerability of the land around the buildings at the Faculty of Science and Technology. Based on the regional geology in this area, the Muara Enim formation (TMPM) is formed in the Tertiary age which is composed of rocks from interbedded tuffaced sandstones with tuffaced mudstones, interbedded quartz sandstones with quartz mudstones, interbedded with coal and iron oxide. The rocks formed in this formation are a type of sedimentary rock. To carry out soil vulnerability analysis, the HVSR method is applied to measure microtremors. Microtremors are a geophysical method that uses very small and continuous ground vibrations. This HVSR method is a passive seismic method using three components, namely 2 horizontal components and 1 vertical component. Microtremor measurements on the ground were carried out at 6 points around the building. The results obtained from microtremor measurements using the HVSR method are the natural frequency (f0), amplification factor (A0) and Seismic Vulnerability Index (Kg). The natural frequency (f0) value ranges from 1.30-1.82 Hz, the amplification factor (A0) value ranges from 1.69 - 3.28 times and the seismic vulnerability index (kg) value ranges from 1.814167 to 5.948834 x 10^-6 s^2/cm. Based on the Kanai classification, a frequency value < 2.5 HZ includes soil type IV and soil type II with Alluvial Rock lithology formed from delta sedimentation, top soil, mud. With a depth of 30 meters or more. This area has a very thick surface sediment, more than 30 meters. Based on the classification according to Setiawan, the amlification factor is classified as low (A0<3) to medium (3<A0<6). A low to moderate amplification factor indicates that the rock that makes it up is compact/hard. Based on the Refrizon Classification, the Seismic Vulnerability Index value is in the low (kg<3) to medium (3<kg<6) category. The seismic vulnerability index is low to medium, meaning that if a shock occurs there will be no damage because the vulnerability value is medium - low. Based on these three parameters, it can be concluded that the land around the FST building is still classified as safe from shocks.
SURVEI SEBARAN POTENSI AQUIFER MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCLUMBERGER DI DESA BUNGKU KECAMATAN BAJUBANG KABUPATEN BATANGHARI Dinata, Irfan perastya; Januardi, Januardi; Nursafitri, Dian; Akbar, Taufik; Farhan Fatoni, Ahmad; Arliano Satya Ongko, Jason; Kusuma Dewi, Ira; Sucitra Amin, Sarwo
JOURNAL ONLINE OF PHYSICS Vol. 9 No. 3 (2024): JOP (Journal Online of Physics) Vol 9 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v9i3.34060

Abstract

Di Desa Bungku sulit mendapatkan sumber air bersih untuk kelangsungan aktivitas masyarakat di desa yang menggunakan air permukaan (sungai), namun ketika musim kemarau tiba, air sungai mengering sehingga tidak mampu menyediakan air bersih. cadangan air. Tak hanya kuantitas, kualitas air juga mengalami perubahan. Kualitas air dilaporkan telah menurun secara signifikan selama dekade terakhir. Di Desa Bungku juga banyak terdapat ladang minyak, salah satunya adalah ladang minyak milik Pertamina. Keberadaan ladang minyak ini sedikit banyak berdampak pada kualitas air tanah, salah satunya air yang berasal dari sumur warga berbau dan berminyak. Menggunakan metode geolistrik dengan konfigurasi Schlumberger. Berdasarkan hasil interpretasi daerah penelitian, lapisan akuifer yang teridentifikasi pada lapisan batupasir berada pada kedalaman 56,8 m – 101 m. Litologi daerah penelitian terdiri atas tanah pucuk, batulempung, batulempung berpasir, batulanau, dan batupasir. Lapisan akuifer terdapat pada lapisan batupasir, dengan kedalaman 56,8 m – 101m dengan tipe akuifer semi tertekan. Pengukuran dilakukan di sepanjang pemukiman masyarakat Desa Bungku dengan sebaran akuifer relatif sama, yaitu pola akuifer semakin menipis dari timur ke barat.Top of Form  
Co-Authors Andriani, Aulia Arliano Satya Ongko, Jason Dinata, Irfan perastya Farhan Fatoni, Ahmad Fitri Ramadhani, Amelia Husnul Hamdi, Husnul Januardi Januardi, Januardi Juventa, Juventa M.Z, Nazri Mahardika, Rizky Nuklirullah, Nuklirullah Nursafitri, Dian Resta, Ichy Lucya Sarwo Sucitra Amin Situmorang, Salomo Taufik Akbar