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All Journal Jurnal Fisika Unand JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Lina Handayani
Pusat Penelitian Geoteknologi LIPI
Chemistry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Physics

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Metode Geolistrik Konfigurasi Dipole-Dipole Untuk Penetapan Bidang Gelincir Gerakan Tanah di Jajaway, Palabuhanratu, Sukabumi Shinta Kiky Rachmawati; Yayat Sudrajat; Lina Handayani; Dadan Dani Wardhana
Jurnal Lingkungan dan Bencana Geologi Vol 12, No 1 (2021)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v12i1.354

Abstract

ABSTRAKGerakan tanah di kompleks perkantoran Kabupaten Sukabumi di Jajaway, Palabuhanratu, terjadi di luar perkiraan dan perencanaan pembangunan sebelumnya. Untuk melihat kondisi dan luasan daerah gerakan tanah dan dalam usaha mengurangi resiko kerugian lebih besar, diperlukan identifikasi bidang gelincir gerakan tanah di kompleks tersebut. Bidang gelincir dicari berdasarkan model tahanan jenis yang diperoleh dari survei pengukuran geolistrik. Akuisisi data dilakukan pada 7 lintasan, dengan 6 lintasan berarah utara-selatan dan 1 lintasan berarah barat-timur. Metode akusisi yang digunakan adalah tahanan jenis multielektrode dengan konfigurasi dipole-dipole. Hasil penelitian membuktikan bahwa kondisi perlapisan batuan lepas tetapi lebih berat di atas lapisan lempung merupakan salah satu penyebab kejadian pergerakan tanah. Kejadian itu sangat terlokalisir karena kondisi seperti itu tidak ditemukan pada lintasan lainnya.Kata kunci: bidang gelincir, geolistrik, gerakan tanah, konfigurasi dipole-dipole, tahanan jenisABSTRACTGround movement in the Sukabumi Regency office complex (Jajaway, Palabuhanratu), occurred unexpectedly. To reduce the potential risk, we need to identify the slip surface to detect the possibility of more landslides. The resistivity model by the dipole-dipole geoelectrical method was applied to find the slip surface. Data acquisition was carried out in 7 lines: 6 north-south lines and 1 east-west line. The resistivity models present the distribution of resistivity below the surface. Above this clay layer, there is a higher resistivity layer, which is related to sandy tuff and breccia. The condition might cause the previous creeping type of ground movement. The type of layering is not found in the other lines. Therefore we do not expect a similar ground movement would occur in those lines.Keywords: dipole-dipole configuration, geoelectrical, landslide, resistivity, slip surface
Pemodelan Struktur Bawah Permukaan Formasi Jatibarang Berdasarkan Metode Gayaberat Dika Aprilia Susanti; Dwi Pujiastuti; Lina Handayani
Jurnal Fisika Unand Vol 11, No 1 (2022)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2593.333 KB) | DOI: 10.25077/jfu.11.1.131-138.2022

Abstract

Metode gayaberat digunakan untuk mengukur variasi percepatan gayaberat yang timbul akibat perbedaan densitas antar batuan bawah permukaan. Penelitian ini dilakukan di daerah Indramayu Jawa Barat dengan tujuan untuk menentukan sebaran anomali bawah permukaan yang dapat menggambarkan Formasi Jatibarang dan kedalaman basement (batuan dasar). Pengolahan data yang dilakukan meliputi koreksi Bouguer, udara bebas, terrain, lintang, pasang surut, dan koreksi apungan. Pemisahan anomali regional dan residual dan pemodelan kedepan. Hasil pengolahan menghasilkan peta anomali Bouguer, peta anomali regiona dan peta anomali residual. Pemodelan bawah permukaan menggambarkan perlapisan batuan yang didominasi oleh batuan sedimen yaitu batuan pasiran di bagian tengah daerah penelitian, batuan lempung hingga kedalaman 200 meter, serta batuan tuff hingga kedalaman 700 meter, kemudian batuan dasar dibawahnya.
PERCEPATAN PERGERAKAN TANAH MAKSIMUM DAERAH CEKUNGAN BANDUNG: STUDI KASUS GEMPA SESAR LEMBANG Lina Handayani; D. Mulyadi; Dadan D Wardhana; Wawan H.Nur
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 5 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i5.217

Abstract

The highly populated Bandung Basin needs a seismic hazard map, especially due to the existence of Lembang Fault on the north of the area. In this paper, the seismic hazard map was constructed based on calculation of peak ground acceleration (PGA) using Boore’s (1997) empirical attenuation relationship. The model was an assumed earthquake with moment magnitude (Mw) of 6 that was caused by Lembang Fault activity. Data input consists of velocity of seismic wave S, that was obtained through geological unit classification. The result shows three zones with highest PGA values: near the seismic source, lowland at the south of Bandung, and a small area at the west of Bandung.The most significant factors on high PGA values are the distance from the source of an earthquake and the geological unit of an area. Keywords: peak ground acceleration, Lembang Fault, Bandung Basin 
Basement Configuration Of Labuan Basin, Pandeglang, Based On Gravity Data Lina Handayani; Dadan Dani Wardhana
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 2 (2020): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i2.460

Abstract

Pandeglang is located on the coast of the Sunda Strait, which is tectonically active as the source of geological hazards. Basement configuration mapping is required for further understanding in geological characteristic of the land. Gravity method is one of the geophysical techniques that can be applied for the regional subsurface characterization. Gravity measurements were completed in the Pandeglang area, from Tanjung Lesung to Labuan coastline and all passable roads in Pandeglang Regency. The Bouguer anomaly obtained has indicated a steady decreasing anomaly from south-southwest to north-northeast area. The result of residual anomalies analysis and basement depth estimation presented a deep basin in the northeast most of the study area (Labuan – Picung), which indicates a thick sediment layer in this area.Keywords: gravity anomaly, residual anomaly, basin, basement, Labuan, Pandeglang. 
Co-Authors D. Mulyadi Dadan D Wardhana Dadan Dani Wardhana Dadan Dani Wardhana Dika Aprilia Susanti Dwi Pujiastuti Shinta Kiky Rachmawati Wawan H.Nur Yayat Sudrajat