Rossy. YS (2018) Pemodelan 2-D Struktur Bawah Permukaan Berdasarkan Analisis Phase Tensor Pada Data Magnetotellurik, Studi Kasus Daerah Majalengka, Jawa Barat. Sarjana thesis, Universitas Brawijaya.
Abstract
Penerapan analisis phase tensor dilakukan pada data magnetotellurik dengan stasiun pengukuran berjumlah 12 yang berada di daerah Majalengka, Jawa Barat. Informasi dimensionalitas struktur regional dan geoelectrical strike dapat diperoleh dari analisis ini, yang dijadikan sebagai dasar dalam pemodelan dan rotasi data magnetotellurik. Dari hasil analisis phase tensor didapatkan nilai skew angle β yaitu -3 ≤ β ≤ 3, sehingga diduga bahwa struktur regional daerah penelitian berupa 2-D. Nilai geoelectrical strike yang didapatkan dari analisis phase tensor adalah N105°E. Asumsi arah geoelectrical strike didukung oleh data induction vector yang mengarah ke timur laut – barat daya, tegak lurus terhadap struktur yang bersifat konduktif. Pemodelan data magnetotellurik dilakukan berdasarkan informasi dimensionalitas dan data dirotasi sesuai arah geoelectrical strike. Hasil pemodelan data magnetotellurik 2-D berupa penampang resistivitas bawah permukaan dengan rentang nilai resistivitas 1 ohm.m hingga ±5000 ohm.m. Nilai resistivitas 1 – 10 ohm.m yang ditunjukkan oleh skala warna biru diinterpretasikan sebagai Formasi Subang. Nilai resistivitas 22 – 490 ohm.m yang ditunjukkan oleh skala warna hijau diinterpretasikan sebagai Formasi Halang. Nilai resistivitas besar dari 1063 ohm.m yang ditunjukkan oleh skala warna kuning hingga merah pada penampang resistivitas, diinterpretasikan sebagai batuan kristalin basement hasil proses vulkanik.
English Abstract
The application of phase tensor analysis was carried out on magnetotelluric data with 12 measurement stations located in Majalengka, West Java. Dimensionality information on regional structures and geoelectrical strike obtained from phase tensor analysis is used as a basis for modeling and rotating magnetotelluric data. Phase tensor analysis results obtained skew angle β value is -3 ≤ β ≤ 3, so it is suspected that the regional structure of the research area is 2-D. The geoelectrical strike value obtained from phase tensor analysis is N105°E. Assumptions directions geoelectrical strike was supported by the induction vector data that led to Northeast - Southwest, perpendicular to the conductive structure. Magnetotelluric data modeling is based on dimensionality data and rotating data according to geoelectrical strike direction. The modeling results of 2-D magnetotelluric data are subsurface resistivity section with a range of resistivity values of 1 ohm.m to ± 5000 ohm.m. The resistivity value is 1 - 10 ohm.m which is indicated by the blue scale interpreted as a Subang Formation. The resistivity value is 22 - 490 ohm.m which is indicated by the green scale interpreted as a Halang Formation. A large resistivity value of 1063 ohm.m which is indicated by a yellow to red scale in the resistivity section, is interpreted as crystalline rock basement as the result of volcanic processes.
| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | SKR/MIPA/2018/507/051900507 |
| Uncontrolled Keywords: | metode magnetotellurik, p/hase tensor, dimensionalitas, geoelectrical strike |
| Subjects: | 500 Natural sciences and mathematics > 515 Analysis > 515.6 Other analytic methods > 515.63 Vector, tensor, spinor analysis |
| Divisions: | Fakultas Matematika dan Ilmu Pengetahuan Alam > Fisika |
| Depositing User: | Endang Susworini |
| Date Deposited: | 07 Jul 2020 12:30 |
| Last Modified: | 07 Jul 2020 12:30 |
| URI: | http://repository.ub.ac.id/id/eprint/168554 |
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