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All Journal POSITRON PRISMA FISIKA BERKALA SAINSTEK Journal of Degraded and Mining Lands Management Phi : Jurnal Pendidikan Fisika dan Terapan Jurnal Fisika Unand JGE (Jurnal Geofisika Eksplorasi) Jurnal Geosaintek JOURNAL ONLINE OF PHYSICS Jurnal Fisika FLUX Buletin Sumber Daya Geologi Jurnal Geosains dan Teknologi GERVASI: Jurnal Pengabdian kepada Masyarakat Jurnal Teori dan Aplikasi Fisika Jurnal Kumparan Fisika Jurnal Teras Fisika : Teori, Modeling, dan Aplikasi Fisika Jurnal Fisika dan Terapannya Bubungan Tinggi: Jurnal Pengabdian Masyarakat Community Empowerment Bulletin of Geology Jurnal Geosaintek BULETIN FISIKA
Perdhana, Radhitya
Universitas Tanjungpura
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health Social Sciences Other

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Soil magnetic susceptibility analysis as an indicator of landslide-prone areas in Sanggau Regency, West Kalimantan Province, Indonesia Muhardi; Perdhana, Radhitya
Journal of Degraded and Mining Lands Management Vol. 12 No. 2 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2025.122.7185

Abstract

Sanggau Regency is a highland area that has a rough topography with a relief of undulating hills, causing the potential for landslides. One of the steps to reduce the impact of landslides is to identify the characteristics of landslide-prone areas by conducting magnetic susceptibility analysis in landslide-prone areas. This analysis is a method to identify landslide indicators based on their magnetic properties. This method identifies landslide potential through superparamagnetic grains on the surface soil. The presence of the grain can be known from the frequency-dependent susceptibility . The study was conducted on 40 soil samples taken at a 20-30 cm depth at Jalan Sabang Merah, Sanggau Regency. The results showed that the average values of low-frequency  and high-frequency  were 5.555 cm3/g and 5.478 cm3/g, respectively. A total of 36 soil samples have a  percentage of 0% (containing less than 10% superparamagnetic grains), two soil samples have a  percentage of 3.51% and 6.45%, respectively (containing 10%-75% superparamagnetic grains, and two samples have a  percentage of 10.48%-12.63% (containing more than 75% superparamagnetic grains). The interpretation results show that soil samples with more than 75% superparamagnetic grains indicate landslide-prone areas in the study site; thus, the areas suspected to have a high level of vulnerability are in the northeastern and southwestern parts of the study site.
Fault Identification Based on Tulungagung Magnetic Anomaly Map Kurniawati, Nur Laily; Muhardi, Muhardi; Perdhana, Radhitya
BERKALA SAINSTEK Vol. 12 No. 4 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i4.46883

Abstract

Tulungagung and Trenggalek are two regencies located south of Java Island with quite complex geological conditions because they are located in the Southern Mountains area. This study aims to identify the presence of faults based on the magnetic anomaly value of the Tulungagung sheet. The presence of faults at the research site were determined based on three lines on the regional magnetic anomaly using First Horizontal Derivative (FHD) and Second Vertical Derivative (SVD) derivative analyses. The results show that the regional magnetic anomaly is -210.7 nT to 113.2 nT. Line A-A' identified two fault locations at a distance of 15 km and 27 km from the line's starting point. Line B-B' identified three fault locations at a distance of 4 km, 27 km, and 45 km from the line's starting point. Line C-C' identified three fault locations at 10 km, 22 km, and 42 km from the line's starting point. The interpretation results also obtained subsurface lithology in the Alluvium Formation, Arjosari-Mandalika Formation, Wungkal Limestone Formation, and Malihan Rock Formation.
Geophysical data acquisition education for high school students through field observation Muhardi, Muhardi; Putra, Yoga Satria; Perdhana, Radhitya; Jumarang, Muh Ishak; Sampurno, Joko; Muliadi, Muliadi; Ihwan, Andi; Adriat, Riza; Zulfian, Zulfian; Sutanto, Yuris; Faryuni, Irfana Diah
Community Empowerment Vol 10 No 3 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ce.12423

Abstract

Most high school students in Singkawang City and Bengkayang Regency still require a more comprehensive understanding regarding the application of geophysics, which can impact their skills in conducting field observations. This Community Service (PkM) aims to enhance students' skills in geophysical data acquisition through field observations at Karta Beach, Bengkayang Regency. The activity was carried out in three stages: preparation, implementation, and evaluation. During the implementation stage, participants were educated about geophysical data acquisition through field observations, including geoelectric, self-potential, meteorology, and geology practicums. Based on the evaluation results, a score of 87.31 (very good) was obtained, indicating an increase in students' skills in geophysical data acquisition through field observations.
Pemodelan 2D Struktur Geologi Bawah Permukaan Daerah Lumbang Rarat, Tapanuli Utara, Berdasarkan Data Gravitasi GGMPlus 2013 Pirdaus, Risky Marolop; Muhardi, Muhardi; Perdhana, Radhitya
Jurnal Geosains dan Teknologi Vol 8, No 1 (2025)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.8.1.2025.16-23

Abstract

Penelitian ini bertujuan untuk mengidentifikasi struktur geologi bawah permukaan berdasarkan nilai anomali gravitasi di daerah Lumbang Rarat, Tapanuli Utara, Sumatra Utara. Daerah ini merupakan wilayah dengan kondisi geologi kompleks yang dipengaruhi oleh aktivitas tektonik. Data yang digunakan pada penelitian ini diunduh dari Global Gravity Model plus (GGMplus) 2013. Penentuan nilai rata-rata densitas batuan dilakukan menggunakan metode Parasnis, sedangkan identifikasi struktur geologi dilakukan menggunakan analisis First Horizontal Derivative (FHD) dan Second Vertical Derivative (SVD). Pemodelan 2D dilakukan pada anomali regional dengan tiga lintasan untuk mengetahui kondisi bawah permukaan. Hasil pemodelan 2D menunjukkan bahwa formasi batuan di daerah penelitian terdapat tiga jenis, yaitu Formasi Tufa Toba (Qvt) dengan densitas 1,9 g/cm3, Formasi Gunungapi Sihabuhabu (Tuvs) dengan densitas 2,2 g/cm3, dan Formasi Kelompok Tapanuli Tak Terpisahkan (Put) dengan densitas 2,5 g/cm3. Hasil penelitian juga menunjukkan adanya struktur sesar yang membentuk struktur horst dan graben pada formasi Tuvs dan Put sebagai basement. Berdasarkan hasil ini, disarankan untuk melakukan studi lebih lanjut terkait pemetaan dan mitigasi risiko bencana geologi, terutama untuk mengidentifikasi potensi sesar aktif yang dapat mempengaruhi kestabilan tanah di daerah tersebut.
IDENTIFIKASI POTENSI SEBARAN MINERAL MANGAN (Mn) BERDASARKAN ANOMALI MEDAN MAGNETIK PADA LEMBAR KUPANG, NUSA TENGGARA TIMUR Putra, Yoga Satria; HERMAWAN, RIKKI; Perdhana, Radhitya
Bulletin of Geology Vol 5 No 4 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2021.5.4.5

Abstract

Telah dilakukan identifikasi potensi sebaran mineral Mangan (Mn) di daerah Kupang, Nusa Tenggara Timur berdasarkan anomali medan magnetik lembar Kupang. Pemodelan 3D dengan data anomali medan magnetik dilakukan pada grid anomali medan magnet residual yang berkorelasi dengan Formasi Bobonaro. Formasi Bobonaro diduga sebagai formasi pembawa mineral Mn. Lokasi yang diduga memiliki potensi mineral Mn adalah lokasi yang memiliki nilai suseptibilitas berkisar antara 0,0005 sampai 0,001 SI pada penampang 3D di lima grid anomali medan magnet residual. Berdasarkan nilai suseptibilitas pada lima lokasi pemodelan tersebut maka diduga keberadaan mineral Mn terletakpada batas kontras antara anomali medan magnet tinggi dan rendah. Dalam penelitian ini,daerah yang diduga berpotensi memiliki sebaran mineral Mn adalah lokasi pada pemodelan tiga yang ditunjukan dengan nilai suseptibilitas Mn yang tersebar hingga dekat permukaan pada Formasi Bobonaro. Dari kajian yang dilakukan dapat disimpulkan bahwa identifikasi potensi sebaran mineral Mn dapat dilakukan berdasarkan pada data anomali medan magnetik. Pemodelan 3D dengan metode inversi pada grid anomali medan magnet residualdapat memberikan informasi tentang lokasi sebaran mineral Mn di bawah permukaan. Kata kunci: Anomali medan magnetik, mineral Mn, formasi Bobonaro, pemodelan 3D magnetik, medan magnet residual
ESTIMASI KEDALAMAN LAPISAN AKUIFER MENGGUNAKAN METODE VERTICAL ELECTRICAL SOUNDING DI DESA SENGKUBANG, KECAMATAN MEMPAWAH HILIR, KABUPATEN MEMPAWAH, KALIMANTAN BARAT Rantika, Ika; Muhardi, Muhardi; Perdhana, Radhitya
Bulletin of Geology Vol 7 No 2 (2023): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2023.7.2.1

Abstract

Desa Sengkubang merupakan salah satu desa yang berada di Kecamatan Mempawah Hilir, Kabupaten Mempawah, Kalimantan Barat, yang memperoleh air bersih dari sumur galian dan air hujan. Permasalahan yang sering dihadapi dari pemanfaatan air bersih tersebut adalah ketersediaannya yang masih sangat terbatas, sehingga diperlukan informasi tentang keberadaan air tanah pada lapisan akuifer yang lebih dalam. Tujuan penelitian ini adalah untuk mengidentifikasi sebaran nilai resistivitas bawah permukaan secara sounding dan mengestimasi kedalaman lapisan akuifer. Metode yang digunakan pada penelitian ini adalah metode vertical electrical sounding (VES). Pengambilan data di lapangan dilakukan di 4 titik pengukuran dengan bentangan elektroda arus masing-masing sebesar 500 m. Sebaran nilai resistivitas bawah permukaan secara sounding di lokasi penelitian yaitu 1,62 Ωm – 2.249,77 Ωm. Hasil interpretasi menunjukkan lapisan tanah bagian atas (top soil) memiliki nilai resistivitas 27,91 Ωm – 134,01 Ωm dengan kedalaman hingga 1,58 m. Lapisan bawah permukaan diduga berupa pasir dengan nilai resistivitas 3,83 Ωm – 60,90 Ωm, pasir lempungan dengan nilai resistivitas 15,87 Ωm – 17,95 Ωm, lempung dengan nilai resistivitas 1,62 Ωm – 5,50 Ωm, kerikil dengan nilai resistivitas 471,49 Ωm, dan batuan dasar dengan nilai resistivitas 1.014,38 Ωm – 2.249,77 Ωm. Hasil penelitian menunjukkan bahwa lapisan akuifer bebas (unconfinedaquifer) diidentifikasi di keempat titik sounding dengan kedalaman 0,30 m – 31,53 m, sedangkan lapisan akuifer tertekan (confined aquifer) hanya diidentifikasi di titik sounding 1 dengan kedalaman 22,70 m – 54,18 m. Kata kunci: Akuifer, geolistrik, resistivitas, vertical electrical sounding
PENERAPAN METODE AMPLITUDE VARIANCE FREQUENCY PADA DATA SEISMIK DAERAH RESERVOIR DENGAN STUDI KASUS LAPANGAN TEAPOT USA Rezeki, Desi Saputri Sri; Putra, Yoga Satria; Perdhana, Radhitya; Arman, Yudha; Muhardi, Muhardi
Jurnal Geosaintek Vol. 9 No. 1 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penelitian ini dilakukan dengan menerapkan metode Amplitude Variance Frequency (AVF) terhadap data Post Stack Time Migration (3D PSTM ) yang diunduh dari laman Wiki SEG secara bebas. Dekomposisi spektral dengan metode Continuous Wavelet Transform (CWT) dilakukan untuk mendapatkan nilai frekuensi yang bervariasi 25 Hz – 70 Hz per 5 Hz dari data seismik sehingga mendapatkan 10 volume iso CWT yang kemudian digunakan untuk analisis gradien setelah dilakukan gathering. Analisis gradien dilakukan dengan menggunakan tipe analisis sederhana Two terms Aki-Richards yang menghasilkan nilai intercept(A), gradient(B) dan frekuensi dominan. Nilai yang digunakan sebagai nilai atribut adalah hasil kali intercept(A) dengan gradient(B) yaitu Product(A*B). Nilai atribut yang diperoleh pada sumur 48-X-28 untuk formasi Lakota, Red Peak dan Tensleep berturut-turut adalah -70,79, -115,86 dan -85,86. Atribut AVF menunjukkan zona atenuatif yang diindikasikan sebagai reservoir batupasir dengan nilai negatif yang semakin tinggi (warna merah tua). Indikasi ini didasarkan pada pola peluruhan antara nilai amplitudo terhadap nilai frekuensi.
PENDUGAAN LAPISAN AKUIFER MENGGUNAKAN METODE VERTICAL ELECTRICAL SOUNDING (VES) DI AREA PANTAI GOSONG, KABUPATEN BENGKAYANG Geulis, Yusanneya; Muhardi, Muhardi; Perdhana, Radhitya
Jurnal Geosaintek Vol. 9 No. 3 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

EARTHQUAKE VULNERABILITY MAPPING BASED ON MICROSEISMIC MEASUREMENTS IN THE CAMPUS AREA OF UNIVERSITAS SARJANAWIYATA TAMANSISWA YOGYAKARTA Purnama, Aditya Yoga; Nurhanafi, Kholis; Susanti, Susanti; Wibowo, Nugroho Budi; Perdhana, Radhitya
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 2 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i2.486

Abstract

Building damage caused by earthquakes is more prevalent in the sedimentary areas of Yogyakarta City compared to the hilly regions of Wonosari and Kulonprogo, which have harder soil layers. The campus of Universitas Sarjanawiyata Tamansiswa (UST) is one of the campuses located in Yogyakarta City, where the regional geology is dominated by the Merapi Young Volcanic Deposits Formation. The UST campus area is vulnerable to earthquakes due to its proximity to an active seismic zone, making earthquake vulnerability mapping based on microseismic data an important necessity to support disaster mitigation efforts. The microseismic method was used in this study, while data analysis employed the Horizontal-to-Vertical Spectral Ratio (HVSR). Microseismic measurements were chosen because they have the advantage of not damaging the surface conditions of the ground, thus preserving the environment, and are easy to use in urban areas. The research method stages include survey design, field data collection, data processing and interpretation, and the creation of earthquake vulnerability maps. Data points were collected from 7 locations covering the Universitas Sarjanawiyata Tamansiswa campus area. The research results indicate that the study area has a dominant frequency value ranging from 1.10 to 2.74 Hz. Meanwhile, the amplification value ranges from 1.25 to 2.2. The sediment thickness of the study area ranges from 32 to 79 meters. The Seismic Vulnerability Index (Kg) of the study area ranges from 0.57 to 4 on a low to high scale. Based on the dominant frequency values, amplification, and seismic vulnerability index, the areas of the UST campus that are more vulnerable to earthquakes are the northern, eastern, and central parts, while the southern part is relatively safer.
ESTIMATION OF LATERITE BAUXITE VOLUME USING ORDINARY KRIGING METHOD IN PIASAK VILLAGE, SANGGAU DISTRICT, WEST KALIMANTAN: ESTIMASI VOLUME BAUKSIT LATERIT MENGGUNAKAN METODE ORDINARY KRIGING DI DESA PIASAK, KABUPATEN SANGGAU, KALIMANTAN BARAT Murti, Tiffany Budi; Eldoni, Andika; Muhardi; Perdhana, Radhitya
Buletin Sumber Daya Geologi Vol 20 No 2 (2025): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v20i2.493

Abstract

West Kalimantan Province is one of the largest bauxite-producing areas in Indonesia, with total reserves of 0.85 billion tons from 1.26 billion tons of national reserves. One of the areas with potential bauxite in Sanggau Regency, West Kalimantan, is Piasak Village. Estimating bauxite resources is an essential step in identifying reserves in a mining area. This study aims to estimate the volume of laterite bauxite in Piasak Village, Sanggau Regency. This study applies the ordinary kriging estimation method based on test pit samples at 47 locations. Data processing was conducted using QGIS and Saga GIS software. The statistics calculation of bauxite deposit thickness data obtained a coefficient of variation of 0.2, indicating that the samples were homogeneous. The spherical semivariogram model was used for the kriging estimation process of bauxite deposit thickness because it had the smallest root mean square error. The parameter values for nugget, sill, and range were 0.08 m2, 1.15 m2, and 100.9 m, respectively. The estimation results show that the volume of laterite bauxite at the study site is 180,051 m3, while the volume of overburden is 56,796 m3.
Co-Authors Adiltha, Fatina Aditya Yoga Purnama Ahmad Mushawwir Andi Ihwan Azrual Azwar Budi Eka Nurcahya, Budi Eka Danti, Namira Devi, Marsiana Dwiria Wahyuni Eldoni, Andika Esau Cornelius Fadjryan Fadjryan Geulis, Yusanneya Harsita, Sri Hermawan, Rikki Irfana Diah Faryuni Irvan Nur Prasetya Ja'a Khairuni Joko Sampurno Jumarang, Muh Ishak Kholis Nurhanafi Kurniawati, Nur Laily Lestari, Tri Mukti Lutfiahani, Rana Maulia, Nasya Putri Mitranikasih Laia Muh. Ishak Jumarang Muhammad Reza July Utama Muhardi Muhardi Muhardi Muliadi Muliadi Muliadi Muliadi Murti, Tiffany Budi Nasharuddin Novianti, Teti Amalia Nugroho Budi Wibowo Nugroho, Kunto Adi Nuraisyah Nuraisyah Nurhasanah Nurhasanah Nurhasanah Nurhasanah Okto Ivansyah Pirdaus, Risky Marolop Prasetya, Irvan Nur Randha Ayu Nurwulandari Rantika, Ika Reka Oktavina Rezeki, Desi Saputri Sri Rika Kurniasih Riza Adriat Rohmawati Metaningrum Safrilia, Putri Sarifah Sarifah Satria Putra, Yoga Siti Helmyati Siti Purnawasih Susanti Susanti Tisar Dewi Pratiwi Utama, Ahmad Muhadjir Vikki Vikki Wahyunugroho, Ageng Fajar Winarsih Winarsih Yoga Satria Putra Yudha Arman Yuris Sutanto Yuris Sutanto Yusanneya Geulis Zulfian Zulfian Zulkifli, Reynaldi