مجله ژئوفیزیک ایران

مجله ژئوفیزیک ایران

Subsurface lithological interpretation of the landslide-prone Cipendawa area, Cianjur (Indonesia), using 2D and 3D inversion of aeromagnetic data

مقالات آماده انتشار

نوع مقاله : مقاله پژوهشی‌

نویسندگان
Ahmad Ali Muckharom 1
Agus Setyawan 2
Agustya Adi Martha 3
Bono Pranoto 4
Tio Azhar Prakoso Setiadi 5
1 M.Sc., Physics Department, Faculty of Science and Mathematics, Diponegoro University, Semarang, Indonesia
2 Professor, Physics Department, Faculty of Science and Mathematics, Diponegoro University, Semarang, Indonesia
3 Ph.D., National Research and Innovation Agency (BRIN RI), West Java, Indonesia
4 M.Sc., National Research and Innovation Agency (BRIN RI), West Java, Indonesia
5 Ph.D., Student, National Research and Innovation Agency (BRIN RI), West Java, Indonesia
10.30499/ijg.2025.493770.1654
چکیده
Cipendawa, Cianjur (Indonesia), has been declared unsuitable as a permanent housing relocation site for earthquake victims due to the slope of the land, soft soil conditions, and the potential for volcanic eruptions. This research aims to interpret the subsurface structures of the Cipendawa area using the aeromagnetic method, considering variations caused by heterogeneous subsurface lithology. Data acquisition was carried out using a drone-mounted Sensys R3 magnetometer at 135 measurement points, including measurements of total magnetic field. Data processing included IGRF (International Geomagnetic Reference Field) correction, reduction to the pole (RTP), and both two-dimensional and three-dimensional modeling. Qualitative interpretation results indicate three magnetic anomaly patterns. High magnetic anomalies (245 nT-441 nT), observed in the southeastern and northwestern parts of the area, are interpreted as volcanic rocks such as basalt and andesite. Medium magnetic anomalies (193 nT-238 nT), located in the southwestern and central areas, are thought to be sandstone. Low magnetic anomalies (-21 nT-185 nT), found in the northern parts, are interpreted as limestone and sandstone. The analysis of three cross-sections shows variations in rock susceptibility from -23×10-4SI to 54×10-4SI within the depth range of 0-40 meters. It indicates that the northern area consists of sedimentary rocks, such as sandstone, formed by river flow that carries magnetite-rich minerals, while the southern area is composed of volcanic rocks, such as andesite breccia, which align with the geological map due to magma intrusion from Mount Gede in the past. Furthermore, three-dimensional modeling of the Cipendawa area indicates that the landslide-prone sedimentary rock layer is located in the northern part, while the hard rock layer in the southeastern part is more stable. However, the southeastern region could still experience landslides in the event of tectonic activity.
کلیدواژه‌ها
IGRF, landslides, lithology, subsurface, magnetic method, RTP

موضوعات

عنوان مقاله English

Subsurface lithological interpretation of the landslide-prone Cipendawa area, Cianjur (Indonesia), using 2D and 3D inversion of aeromagnetic data

نویسندگان English

Ahmad Ali Muckharom 1
Agus Setyawan 2
Agustya Adi Martha 3
Bono Pranoto 4
Tio Azhar Prakoso Setiadi 5
1 M.Sc., Physics Department, Faculty of Science and Mathematics, Diponegoro University, Semarang, Indonesia
2 Professor, Physics Department, Faculty of Science and Mathematics, Diponegoro University, Semarang, Indonesia
3 Ph.D., National Research and Innovation Agency (BRIN RI), West Java, Indonesia
4 M.Sc., National Research and Innovation Agency (BRIN RI), West Java, Indonesia
5 Ph.D., Student, National Research and Innovation Agency (BRIN RI), West Java, Indonesia
چکیده English

Cipendawa, Cianjur (Indonesia), has been declared unsuitable as a permanent housing relocation site for earthquake victims due to the slope of the land, soft soil conditions, and the potential for volcanic eruptions. This research aims to interpret the subsurface structures of the Cipendawa area using the aeromagnetic method, considering variations caused by heterogeneous subsurface lithology. Data acquisition was carried out using a drone-mounted Sensys R3 magnetometer at 135 measurement points, including measurements of total magnetic field. Data processing included IGRF (International Geomagnetic Reference Field) correction, reduction to the pole (RTP), and both two-dimensional and three-dimensional modeling. Qualitative interpretation results indicate three magnetic anomaly patterns. High magnetic anomalies (245 nT-441 nT), observed in the southeastern and northwestern parts of the area, are interpreted as volcanic rocks such as basalt and andesite. Medium magnetic anomalies (193 nT-238 nT), located in the southwestern and central areas, are thought to be sandstone. Low magnetic anomalies (-21 nT-185 nT), found in the northern parts, are interpreted as limestone and sandstone. The analysis of three cross-sections shows variations in rock susceptibility from -23×10-4SI to 54×10-4SI within the depth range of 0-40 meters. It indicates that the northern area consists of sedimentary rocks, such as sandstone, formed by river flow that carries magnetite-rich minerals, while the southern area is composed of volcanic rocks, such as andesite breccia, which align with the geological map due to magma intrusion from Mount Gede in the past. Furthermore, three-dimensional modeling of the Cipendawa area indicates that the landslide-prone sedimentary rock layer is located in the northern part, while the hard rock layer in the southeastern part is more stable. However, the southeastern region could still experience landslides in the event of tectonic activity.

کلیدواژه‌ها English

IGRF, landslides, lithology, subsurface, magnetic method, RTP
Abdullah, M. F., and Sunaryo, S., 2014, Pendugaan Jenis Batuan Bawah Permukaan Daerah Bandungan Karangkates Menggunakan Metode Geomagnetik: Physics Students Journal, 2(1), 741–744.
Agustin, F., and Bronto, S., 2019, Volkanostratigrafi Inderaan Jauh Kompleks Gunungapi Gede dan Sekitarnya, Jawa Barat, Indonesia: Jurnal Geologi Dan Sumberdaya Mineral, 20(1), 9.
Badan Meteorologi Klimatologi dan Geofisika (BMKG), 2022, Laporan Hasil Kajian Kelayakan Lahan Relokasi.
Bemmelen, R. W., 1970, The Geology of Indonesia: Martinus Nijhoff.
Blakely, R. J., 1995, Potential Theory in Gravity and Magnetic Applications: Cambridge University Press, Cambridge Core.
Bouligand, C., Glen, J. M. G., and Blakely, R. J., 2014, Distribution of buried hydrothermal alteration deduced from high-resolution magnetic surveys in Yellowstone National Park: Journal of Geophysical Research: Solid Earth, 119(4), 2595–2630, https://doi.org/10.1002/2013JB010802.
Caratori Tontini, F., Tivey, M. A., de Ronde, C. E. J., and Humphris, S. E., 2019, Heat flow and near-seafloor magnetic anomalies highlight hydrothermal circulation at Brothers Volcano Caldera, Southern Kermadec Arc, New Zealand: Geophysical Research Letters, 46(14), 8252–8260, https://doi.org/10.1029/2019GL083517.
Koesmono, M., 1976, Peta geologi lembar Sindangbarang dan Bandarwaru, Jawa (Geologic map of the Sindangbarang and Bandarwaru).
Maulidan, I. F., Tri Suci, R., Mahendra, A., and Putra, A., 2021, Interpretation of subsurface structure based on the magnetic data at Semurup Geothermal Area Kerinci: Jurnal Ilmu Fisika Universitas Andalas, 13(2), 101–108, https://doi.org/10.25077/jif.13.2.101-108.2021.
Menteri Pekerjaan Umum., 2007, Peraturan Menteri Pekerjaan Umum No 22/PRT/M/2007 tentang Pedoman Penataan Ruang Kawasan Rawan Bencana Longsor, Menteri Pekerjaan Umum.
Purwantoro, T., Rachman, A., and Silaban, M., 2010, Potensi dan Rencana Pengembangan Lapangan Panas Bumi Patuha Jawa Barat: 39th IAGI Annual Convention and Exhibition.
Pusat Vulkanologi Mitigasi Bencana Geologi (PVMBG), 2023, Analisis Potensi Bahaya Geologi di Cianjur.
Satria, D. P. B., Kusratmoko, E., 2007, Tanah longsor di sekitar Pacet - Cianjur (Provinsi Jawa Barat).
Setiawan, A., Supriatna, Waryono, T., Wibowo, A., and Saraswati, R., 2015, Declined Revisions (Author Decided to Cancel the Whole Submission), Universitas Indonesia.
Sihombing, S., Dewi, I. K., and Sibuea, C. H. G., 2023, Identifikasi Litologi Bawah Permukaan Daerah Rawan Longsor Menggunakan Metode Geomagnetik di Tikungan Tirtanadi Desa Batu Layang Kecamatan Sibolangit Kabupaten Deli Serdang: Jurnal Teknik Kebumian, 10(1).
Situmorang, T., and Hadisantono, R., 1992, Peta geologi Gunungapi Gede, Cianjur, Jawa Barat: Direktorat Vulkanologi.
Sudjatmiko, 1972, Peta Geologi Lembar Cianjur, Jawa Barat, Bandung: Pusat Penelitian dan Pengembangan Geologi.
Syafnur, A., Jibran, H., Tonapa, W. D., Sae, A., and Nurdin, N. H., 2023, Investigation of groundwater aquifer using electrical resistivity method Wenner-Schlumberger array Mattoangin Village, Bantimurung District, Maros Regency: Jurnal Geocelebes, 7(1), 89–98, https://doi.org/10.20956/geocelebes.v7i1.23302.
Telford, W., Geldart, L., and Sheriff, R., 1990, Geofisika Terapan (2nd ed.): Cambridge University Press.
Yasmin, H. S., Pirzada, S. J., Sahroni, T. R., Soekarno, H., Pranoto, B., Puspa, A. D., and Alfisah, 2024, 2D geological structure identification in Mount Ciremai Geothermal Area using the GGMplus data: IOP Conference Series: Earth and Environmental Science, 1344(1), https://doi.org/10.1088/1755-1315/1344/1/012017.
Yunginger, R., Sandi, F. Y., Setiawan, D. G. E., Husen, M. H., Zulkifli, and Ardiyanto, K., 2024, Analysis of landslide potential based on magnetic susceptibility of rocks using geomagnetic methods in Suka Damai Village, Bulango Utara Subdistrict, Bone Bolango Regency: Jurnal Penelitian Fisika Dan Aplikasinya (JPFA), 14(1), 49-66, doi: 10.26740/jpfa.v14n1.p49-66.
مجله ژئوفیزیک ایران

مقالات آماده انتشار، پذیرفته شده
انتشار آنلاین از 08 اردیبهشت 1404