Rachmawati, Shinta Kiky (2019) Identifikasi Bidang Gelincir pada Gerakan Tanah Daerah Pelabuhan Ratu dengan Metode Geolistrik Konfigurasi Dipole-dipole. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pergerakan tanah pernah terjadi di komplek Pemerintahan Kabupaten Sukabumi di Pelabuhan Ratu untuk mengurangi resiko kerugian besar, diperlukan identifikasi bidang gelincir gerakan tanah untuk mengetahui potensi gerakan tanah. Akuisisi data dilakukan pada 7 lintasan dengan 6 lintasan berarah Utara-Selatan dan 1 lintasan berarah Barat-Timur. Metode yang digunakan adalah tahanan jenis multielektrode dengan konfigurasi dipole-dipole. Hasil pengolahan data tahanan jenis di validasi dengan peta geologi daerah pengukuran. Model tahanan jenis yang diperoleh merupakan distribusi nilai tahanan jenis bawah permukaan. Berdasarkan sebaran tahanan jenis, dapat dibedakan setidaknya 5 lapisan batuan. Persebaran batuan bagian selatan di dominasi dengan batuan dengan tahanan jenis ≤ 5,5 Ωm (lempung), 5.5<≤ 10 Ωm (tufa pasiran), 10< ≤30 Ωm (pasir,kerikil,breksi). Sedangkan nilai tahanan jenis tinggi 30<≤100 Ωm (breksi, kerakal, batu pasir), ≥100 Ωm (breksi kompak, bolder) mendominasi bagian utara lokasi penelitian. Tahanan jenis ≤ 5,5 Ωm bersesuaian dengan lempung, yang merupakan bidang gelincir. Lapisan dengan nilai tahanan jenis ≤ 5,5 Ωm ditemukan pada lintasan 2 di kedalaman 15-30 m membentang dari utara ke selatan. Kedalaman dan kemiringan dari bidang gelincir menunjukan adanya kemungkinan longsor jenis rayapan.
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The area in the sukabumi Regency Office in Pelabuhan ratu has a history of land movement. Therefore, to reduce the potential risk, we need to identify slip surface of the possible landside. Resistivity model by dipole-dipole geoelectric method was applied to find the slip surface. Data acquisition was carried out in 7 lines 6 lines North-South and 1 line East-West. The data processing where then validated with geological map of the measurement area. The resistivity models presented the distribution of resistivity below the surface. Based on resistivity value there where at least 5 layers of rocks. The rock with low resistivity ≤ 5,5 Ωm (clay) dominatedin the southern area, 5,5<≤ 10 Ωm (sandy tuff), 10< ≤30 Ωm (sand, gravel,breccia). While the northern area dominated by high resistivity of 30<≤100 Ωm (sand stone), ≥100 Ωm (compact breccia). The resistivity layer of ≤ 5,5 Ωm corresponds to clay as the potential layer of the slip surface. The layer with a resistivity ≤ 5,5 Ωm was found on Line 2 at 15-30 meters depth, from north to south. The depth and the gradient of the slip surface indicated a potential creeping landslide in this area.
| Item Type: | Thesis (Other) |
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| Uncontrolled Keywords: | bidang gelincir, gerakan tanah, konfigurasi dipole-dipole, geolistrik, tahanan jenis |
| Subjects: | Q Science > QE Geology > QE599 Landslides. Rockslides Q Science > QE Geology > QE601 Geology, Structural |
| Divisions: | Faculty of Natural Science > Physics > 45201-(S1) Undergraduate Thesis |
| Depositing User: | Shinta Kiky Rachmawati |
| Date Deposited: | 20 Jul 2026 03:21 |
| Last Modified: | 20 Jul 2026 03:21 |
| URI: | http://repository.its.ac.id/id/eprint/65741 |
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