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All Journal JURNAL FISIKA GeoEco JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards)
Wahyudi Wahyudi
Universitas Gadjah Mada
Earth & Planetary Sciences Education Environmental Science Physics Social Sciences

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Prediksi Tipe Longsor di Desa Clapar Menggunakan Metode Geolistrik Resistivitas Konfigurasi Dipol-dipol Muhardi Muhardi; Wahyudi Wahyudi
Jurnal Lingkungan dan Bencana Geologi Vol 11, No 2 (2020)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v11i2.290

Abstract

Desa Clapar merupakan salah satu desa di Kabupaten Banjarnegara, Jawa Tengah, yang tergolong daerah rawan longsor. Tujuan penelitian ini adalah untuk memprediksi tipe longsor dengan menganalisis bidang gelincir berdasarkan sebaran nilai resistivitas secara lateral. Penelitian ini mengaplikasikan metode geolistrik resistivitas dengan konfigurasi dipol-dipol. Pengukuran dilakukan di dua lokasi, yaitu lereng bukit sebelah barat dan timur kawasan pemukiman, yang masing-masing terdiri dari 2 dan 3 lintasan pengukuran. Hasil penelitian menunjukkan bahwa bidang gelincir pada lokasi pertama mempunyai nilai resistivitas sebesar 2,93 - 47,43 Ωm, berupa lapisan lempung dengan bidang berbentuk relatif rata pada kedalaman 4,5 - 15,0 meter. Demikian juga dengan bidang gelincir pada lokasi kedua yang mempunyai nilai resistivitas sebesar 1,32 - 14,38 Ωm, berupa lapisan lempung dengan bidang berbentuk relatif rata pada kedalaman 1,5 - 7,0 meter. Hasil penelitian juga menunjukkan bahwa tipe longsor di Desa Clapar diprediksi sebagai longsor translasi.Kata kunci: bidang gelincir, Clapar, konfigurasi dipol-dipol, metode geolistrik resistivitas, tipe longsor Clapar Village is one of the village in Banjarnegara Regency, Central Java, which is classified as landslides prone area. This study aims to predict the landslides type by analyzing the slip surface based on the distribution of resistivity values laterally. This study applied the geoelectrical resistivity method of dipole-dipole configuration. The measurements were conducted in twoareas, on the hill slope western and eastern of the settlement area, which was consist of 2 and 3 lines, respectively. Thestudy results show that the slide surface in the first area has resistivity value of 2.93 - 47.43 Ωm inferred as relatively flat clay layer at a depth of 4.5 - 15.0 meters. While The slip surfacein the second area has a similar case with resistivity value of 1.32 - 14.38 Ωm inferred as a clay layer at a depth of 1.5 - 7.0 m. In addition, the landslides type in Clapar Village is predicted as a translational landslides. Keywords: slip surface, Clapar, dipole-dipole configuration, geoelectrical resistivity method, landslides type
Identifikasi Litologi Area Rawan Longsor di Desa Clapar Menggunakan Metode Geolistrik Resistivitas Konfigurasi Schlumberger Muhardi Muhardi; Wahyudi Wahyudi
Jurnal Fisika Vol 9, No 2 (2019)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jf.v9i2.21409

Abstract

Desa Clapar Kecamatan Madukara Kabupaten Banjarnegara merupakan salah satu daerah di Provinsi Jawa Tengah yang rawan terhadap bencana longsor. Penelitian ini dilakukan untuk mengetahui sebaran nilai resistivitas batuan bawah permukaan secara vertikal. Sebaran nilai resistivitas batuan akan dijadikan acuan dalam mengidentifikasi litologi bawah permukaan di area rawan longsor Desa Clapar. Penelitian ini dilakukan dengan menggunakan metode geolistrik resistivitas konfigurasi Schlumberger. Pengukuran dilakukan pada lima lokasi dengan bentangan masing-masing sejauh 200 m. Hasil penelitian mengidentifikasi sebaran resistivitas batuan bawah permukaan secara vertikal hingga kedalaman 58 m dengan nilai 0,71 hingga 717,78 Ωm. Litologi bawah permukaan area rawan longsor Desa Clapar berupa tanah penutup, pasir lempungan, lempung, batupasir, dan breksi.
THE ESTIMATION OF SUBSURFACE STRUCTURE WITHIN GEOTHERMAL MANIFESTATION AREA AS AN OUTFLOW ZONE USING GEOELECTRICAL RESISTIVITY METHOD IN TEGAL, JAWA TENGAH Hangga Novian Adi Putra; Wahyudi Wahyudi
GeoEco Vol 7, No 1 (2021): GeoEco January 2021
Publisher : Universitas Sebelas Maret (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/ge.v7i1.42392

Abstract

Indonesia is one of the country having a lot of geothermal fields potentially used as a source of energy. For example, Java island is noted to have almost 57 geothermal fields. One of those geothermal fields which is rarely studied is Guci geothermal field. Hence, there was conducted a research to investigate the subsurface image and geothermal system in Guci geothermal field based on resistivity data. The research in Guci geothermal field was carried out using geoelectrical method. Resistivity geoelectrical research used two configurations, namely dipole-dipole and schlumberger. Data acquisitions for dipole-dipole configuration was done in two lines, 500 metres spread for each line. Whereas the acquisitions for schlumberger configuration was done in four points, 200-250 metres spread for each point. Research result showed that the area of geothermal manifestation in Guci consist of top soil layer, sandstone, andesite, and a fluids-containing layer. A fluids-containing layer is estimated to be related to geothermal manifestation in Guci and is a fault zone. Fault is estimated to be a normal fault and lies in 20 metres depth. Fault within geothermal manifestation area in Guci has a role as the pathway of hot-fluid out to the surface which forms a manifestation.
Co-Authors Hangga Novian Adi Putra Muhardi